SBE 16plus-IM V2 SeaCAT C-T (P) Recorder
The SBE 16plus-IM V2 SeaCAT is a high-accuracy conductivity and temperature (pressure optional) recorder with Inductive Modem (IM) interface designed for long-duration deployments on moorings. It supports numerous auxiliary sensors (dissolved oxygen, turbidity, fluorescence, PAR, etc.) with six A/D channels and one RS-232 data channel. The 16plus-IM V2 has internal batteries and memory.
Data is recorded in memory and can also be output in real-time in engineering units or raw HEX. Battery endurance varies, depending on the sampling scheme; nine alkaline D-cells provide power for 290,000 samples of C and T.
- Moored Conductivity, Temperature, Pressure (optional), and up to seven auxiliary sensors, at user-programmable intervals (10 seconds to 4 hours).
- Inductive Modem (IM) interface, internal memory, and internal alkaline batteries.
- Expendable anti-foulant devices and optional pump for bio-fouling protection.
- Depths to 600, 7000, or 10,500 m (data transmission rated to 8000 m).
- Seasoft© V2 Windows software package (setup, data upload, and data processing).
- Next generation of the SeaCAT family, field-proven since 1987.
- Five-year limited warranty.
- Inductive Modem (IM) system provides reliable, low-cost, real-time data transmission for up to 100 IM-enabled instruments using plastic-coated wire rope (typically 3x19 galvanized steel) as both transmission line and mooring tension member. IM instruments clamp anywhere along the mooring, which is easily reconfigured by sliding and re-clamping instruments on the cable. In a typical mooring, an Inductive Modem Module (IMM) in the buoy communicates with IM instruments and interfaces to a computer/data logger (not supplied by Sea-Bird) via RS-232. The data logger is programmed to poll each IM instrument for data, and sends the data to a satellite link, cell phone, etc.
- Unique internal-field conductivity cell permits use of expendable anti-foulant devices, for long-term bio-fouling protection.
- Aged and pressure-protected thermistor has a long history of exceptional accuracy and stability.
- Optional pressure sensor with temperature compensation is available in eight strain-gauge ranges (to 7000 m) and eleven Digiquartz® ranges (to 10,500 m).
- Optional pump runs for each sample, providing improved conductivity and plumbed auxiliary sensor response, bio-fouling protection, and correlation of CTD and auxiliary sensor measurements.
- Plastic (600 m) or titanium (7000 or 10,500 m) housing (data transmission rated to 8000 m).
- XSG/AG or wet-pluggable MCBH connectors.
- No pressure, or strain-gauge or Digiquartz® pressure sensor.
- SBE 5M pump for pumped conductivity; or SBE 5P or 5T pump for pumped conductivity and auxiliary sensor(s).
- Auxiliary sensors — dissolved oxygen (SBE 63 Optical DO Sensor or SBE 43 [membrane-type] DO Sensor), fluorescence, radiance (PAR), light transmission, turbidity, etc.
- Battery pack kit for lithium batteries (batteries not supplied by Sea-Bird).
|Conductivity||0 to 9 S/m|
|Temperature||-5 to +35 °C|
|Optional Pressure||Strain gauge 0 to 20 / 100 / 350 / 600 / 1000 / 2000/ 3500 / 7000 m;
Quartz 0 to 20 / 60 / 130 / 200 / 270 / 680 / 1400 / 2000 / 4200 / 7000 / 10,500 m
|Conductivity||± 0.0005 S/m|
|Temperature||± 0.005 °C|
|Optional Pressure||Strain gauge ± 0.1% of full scale range; Quartz± 0.02% of full scale range|
|Conductivity||0.0003 S/m per month|
|Temperature||0.0002 °C per month|
|Optional Pressure||Strain gauge 0.1% of full scale range per year; Quartz 0.02% of full scale range per year|
|Conductivity||0.00005 S/m typical|
|Optional Pressure||Strain gauge 0.002% of full scale range; Quartz 0.0006% of full scale range for 1-sec integration|
|Memory & Data Storage||64 Mbyte non-volatile FLASH.
Bytes/sample: 6 T&C; 5 pressure; 2 each external voltage; 4 date & time (RS-232 sensor is sensor dependent)
|Power Supply & Consumption||9 alkaline D-cell batteries provide 290,000 samples CT; 200,000 samples CTD;
110,000 samples CTD & SBE 5M pump (see manual)
|Auxiliary Sensors||Power out up to 500 mA at 10.5 - 11 VDC;
Voltage sensor A/D resolution 14 bits and input range 0-5 VDC
|Housing, Depth Rating, & Weight||Acetal Copolymer Plastic, 600 m, in air 9 kg, in water 4 kg.
3AL-2.5V Titanium, 7000 m, in air 17 kg, in water 12 kg.
6AL-4V Titanium, 10,500 m.
Dimensions in mm (inches)
How can I tell if the conductivity cell on my CTD is broken?
Conductivity cells are made of glass, which is breakable.
- If a cell is cracked, it typically causes a salinity shift or erratic data.
- However, if the crack occurs at the end of the cell, the sensor will continue to function normally until water penetrates the epoxy jacket. Post-cruise calibration results will reveal whether or not water has penetrated the epoxy jacket.
Inspect the cell thoroughly and make sure that it isn’t cracked or abused in any way.
- (SBE 9plus, 25, or 25plus) If the readings are good at the surface but erratic at depth, it is likely that the problem is in the cable or the connector, not the conductivity cell. Check the connections, making sure that you burp the connectors when you plug them in (see Application Note 57: Connector Care and Cable Installation). Check the cable itself (swap with a spare cable, if available).
- If the readings are incorrect at the surface but good after a few meters, it is likely that the problem is flow-related. Verify that the pump is working properly. Check the air bleed valve (the white plastic piece in the Y-fitting, which is installed on vertically deployed CTDs) to see if it is clogged; clean out the small hole with a piece of fine wire supplied with your CTD.
- If the readings are incorrect for the entire cast, there may be an incorrect calibration coefficient or the cell may be cracked.
- Check the conductivity calibration coefficients in the configuration (.con or .xmlcon) file.
- Do a frequency check on the conductivity cell. Disconnect the plumbing on the cell. Rinse the cell with distilled or de-ionized water and blow it dry (use your mouth and not compressed air, as there tends to be oil in the air lines on ships). With the cell completely dry, check the frequency reading. It should read within a few tenths of a Hz of the 0 reading on your Calibration Sheet. If it does not, something is wrong with the cell and it needs to be repaired.
What are the major steps involved in deploying a moored instrument?
Application Note 83: Deployment of Moored Instruments contains a checklist, which is intended as a guideline to assist you in developing a checklist specific to your operation and instrument setup.
What are the recommended practices for connectors - mating and unmating, cleaning corrosion, and replacing?
Mating and Unmating Connectors:
It is important to prepare and mate connectors correctly, both in terms of the costs to repair them and to preserve data quality. Leaking connectors cause noisy data and even potential system shutdowns. Application Note 57: Connector Care and Cable Installation describes the proper care and installation of connectors for Sea-Bird instruments. The Application Note covers connector cleaning and cable or dummy plug installation, locking sleeve installation, and cold weather tips.
Checking for Leakage and Cleaning Corrosion on Connectors:
If there has been leakage, it will show up as green-colored corrosion product. Performing the following steps can usually reverse the effect of the leak:
- Thoroughly clean the connector with water, followed by alcohol.
- Give the connector surfaces a light coating of silicon grease.
Re-mate the connectors properly — see Application Note 57: Connector Care and Cable Installation and 9-minute video covering O-ring, connector, and cable maintenance.
- The main concern when replacing a bulkhead connector is that the o-rings on the connector and end cap must be prepared and installed correctly; if they are not, the instrument will flood. See the question below for general procedure on handling o-rings.
- Use a thread-locking compound on the connector threads to prevent the new connector from loosening, which could also lead to flooding.
- If the cell guard must be removed to open the instrument, take extra care not to break the glass conductivity cell.
What are the recommended practices for inspecting, cleaning, and replacing o-rings?
Inspecting and Cleaning O-Rings and Mating Surfaces:
- Remove any water from the o-rings and mating surfaces with a lint-free cloth or tissue.
- Visually inspect the o-rings and mating surfaces for dirt, nicks, cuts, scratches, lint, hair, and any signs of corrosion; these could cause the seal to fail. Clean the surfaces, and clean or replace the o-rings as necessary.
- Apply a light, even coat of 100% silicon o-ring lubricant (Parker Super O Lube) to the o-rings and mating surfaces. For an end cap o-ring, a ball of lubricant the size of a pea is about all that is needed. Too much lubricant can cause the seal to fail as much, if not more, than no grease. Do not use petroleum-based lubricant (car grease, Vaseline, etc.), as it will cause premature failure of the rubber.
CAUTION: Parker makes another product, Parker O Lube, that is petroleum-based. Do not use this product; verify that you are using Parker Super O Lube.
- After lubricating the o-ring, immediately reassemble the end cap or connector, verifying that no hairs or lint have collected on the lubricated o-ring.
- End Cap O-Rings: We recommend scheduled replacement of end cap o-rings approximately every 3 years, to prevent leaks caused by normal o-ring wear.
- Connector O-Rings: Replacing connector o-rings requires de-soldering and re-soldering the connector wires, which makes it a more difficult task. Therefore, we recommend replacement of connector o-rings when needed, not on a routine, scheduled basis.
- 9-minute video covering O-ring, connector, and cable maintenance.
- Short, silent video of application of lubricant to o-ring.
- Short, silent video of application of lubricant to o-ring mating surface (note the use of a plastic dental syringe — no sharp points to scratch the housing — to apply the lubricant).
How should I handle my CTD to avoid cracking the conductivity cell?
Shipping: Sea-Bird carefully packs the CTD in foam for shipping. If you are shipping the CTD or conductivity sensor, carefully pack the instrument using the original crate and packing materials, or suitable substitutes.
Use: Cracks at the C-Duct end of the conductivity cell are most often caused by:
- Hitting the bottom, which can cause the T-C Duct to flex, resulting in cracking at the end of the cell.
- Removing the soaker tube from the T-C duct in a rough manner, which also causes the T-C Duct to flex. Pulling the soaker tube off at an angle can be especially damaging over time to the cell. Pull the soaker tube off straight down and gently.
- Improper disassembly of the T-C ducted temperature and conductivity sensors (SBE 25, 25plus, and 9plus) when removing them for shipment to Sea-Bird for calibration. See Shipping SBE 9plus, 25, and 25plus Temperature and Conductivity Sensors for the correct procedure.
Note: If a Tygon tube attached to the conductivity cell has dried out, yellowed, or become difficult to remove, slice (with a razor knife or blade) and peel the tube off of the conductivity cell rather than twisting or pulling the tube off.
What is an Anti-Foulant Device? Does it affect the conductivity cell calibration? How often should I replace it? Does it require special handling?
The Anti-Foulant Device is an expendable device that is installed on each end of the conductivity cell, so that any water that enters the cell is treated. Anti-Foulant Devices are typically used with moored instruments (SBE 16, 16plus, 16plus-IM, 16plus V2, 16plus-IM V2, 37-SM, 37-SMP, 37-SMP-IDO, 37-SMP-ODO, 37-SI, 37-SIP, 37-SIP-IDO, 37-IM, 37-IMP, 37-IMP-IDO, 37-IMP-ODO), thermosalinographs (SBE 21 and 45), glider CTDs (Glider Payload CTD), moored profilers (SBE 52-MP), and drifters (SBE 41/41CP Argo float CTDs), and optionally with SBE 19plus, 19plus V2, and 49 profilers.
Anti-Foulant Devices have no effect on the calibration, because they do not affect the geometry of the conductivity cell in any way. The Anti-Foulant Devices are mounted at either end of the conductivity cell. For an in-depth explanation of how Sea-Bird makes the conductivity measurement, see Conductivity Sensors for Moored and Autonomous Operation.
Useful deployment life varies, depending on several factors. We recommend that customers consider more frequent anti-foulant replacement when high biological activity and strong current flow (greater dilution of the anti-foulant concentration) are present. Moored instruments in high growth and strong dilution environments have been known to obtain a few months of quality data, while drifters that operate in non-photic, less turbid deep ocean environments may achieve years of quality data. Experience may be the strongest determining factor in specific deployment environments. Sea-Bird recommends that you keep track of how long the devices have been deployed, to allow you to purchase and replace the devices when needed.
Note that the anti-foulant device does not actually dissolve, so there is no way to visually determine if the anti-foulant device is still effective.
The cost of the anti-foulant devices is small compared to the deployment costs, so we recommend that you replace the devices before each deployment. This will provide the maximum bio-fouling protection, resulting in long-term data quality.
Shelf Life and Storage: The best way to store Anti-Foulant Devices is in an air-tight, opaque container. The rate of release of anti-foulant is based on saturation of the environment. The anti-foulant will release until the environment is fully saturated (100% saturated) and then it will no longer release any anti-foulant. So if you keep Anti-Foulant Devices sealed well in an air-tight container, theoretically they will stay good for extended periods of time. Exposure to direct sunlight can also affect the release of anti-foulant; we recommend storage in an opaque container.
- For details, refer to the Material Safety Data Sheet, enclosed with the shipment and available on our MSDS page.
- Anti-Foulant Devices are not classified by the U.S. DOT or the IATA as hazardous material.
What are the typical data processing steps recommended for each instrument?
Section 3: Typical Data Processing Sequences in the SBE Data Processing manual provides typical data processing sequences for our profiling CTDs, moored CTDs, and thermosalinographs. Typical values for aligning, filtering, etc. are provided in the sections detailing each module of the software. This information is also documented in the software's Help file. To download the software and/or manual, go to SBE Data Processing.
What are the recommended practices for storing sensors at low temperatures, and deploying at low temperatures or in frazil or pancake ice?
Large numbers of Sea-Bird conductivity instruments have been used in Arctic and Antarctic programs.
Special accommodation to keep temperature, conductivity, oxygen, and optical sensors at or above 0 C is advised. Often, the CTD is brought inside protective doors between casts to achieve this.
When freezing is possible, we recommend that the conductivity sensor be stored dry. Remove larger droplets of water by blowing through the cell. Do not use compressed air, which typically contains oil vapor. Attach a length of Tygon tubing to each end of the conductivity cell to close the cell ends. See Application Note 2D: Instructions for Care and Cleaning of Conductivity Cells for details.
There are several considerations to weigh when contemplating deployments at low temperatures in general, and in frazil or pancake ice:
- Ensure that the instrument is at or above water temperature before it is deployed. If the cell gets colder than 0 to -2 ºC while on deck, when it enters the water a layer of ice forms inside the cell as the cell warms to ocean temperature. If ice forms inside the conductivity cell, measurements will be low of correct until the ice layer melts and disappears. Thin layers of ice will not hurt the conductivity cell, but repeated ice formation on the electrodes will degrade the conductivity calibration (at levels of 0.001 to 0.020 psu) and thicker layers of ice can lead to glass fracture and permanent damage of the cell.
- For accurate measurements, keep ice out of the sensing region of the conductivity cell. The conductivity measurement involves determining the electrical resistance of the water inside the sensor. Ice is essentially a non-conductor. To the extent that ice displaces the water, the conductivity will register (very) misleadingly low. Some type of screening is necessary to keep ice out of the cell. This is relatively easy to arrange for the Sea-Bird conductivity cell, which is an electrode-type cell, because its sensing region is totally inside a long tube; plastic mesh could be positioned at each end and would have zero effect on accuracy and stability.
The above considerations apply to all known conductivity sensor types, whether electrode or inductive types.
If deploying at low temperatures but no surface frazil or pancake ice is present, rinse the conductivity cell in one of the following salty solutions (salty water depresses the freezing point) to prevent freezing during deployment. But this does not mean you can store the cell in one of these solutions outside . . . it will freeze.
- Solution of 1% Triton in sterile seawater (use 0.5-micron filtered seawater or boiled seawater), or
- Brine solution (distilled seawater or homemade salt solution that is higher than 35 psu in salinity).
Note that there is still a risk of forming ice inside the conductivity cell if deploying through frazil or pancake ice on the surface, if the freezing point of the salt water is the same as the water temperature. Therefore, we recommend that you deploy the conductivity cell in a dry state for these deployments.
Commercially available alcohol or glycol antifreezes contain trace amounts of oils that will coat the conductivity cell and the electrodes, causing a calibration shift, and consequently result in errors in the data. Do not use alcohol or glycol in the conductivity cell.
In general, neither the accuracy of the temperature measurement nor the survival of the temperature sensor will be affected by ice.
For the SBE 43 and SBE 63 Dissolved Oxygen sensor, avoid prolonged exposure to freezing temperature, including during shipment. Do not store with water (fresh or seawater), Triton solution, alcohol, or glycol in the plenum. The best precaution is to keep the sensor indoors or in some shelter out of the cold weather.
I want to integrate a moored CTD with some auxiliary sensors (transmissometer, fluorometer, etc.). Which CTD should I use?
Sea-Bird currently manufactures only 1 moored CTD that can accept auxiliary sensors, the SBE 16plus V2 SeaCAT (and its inductive modem version, the 16plus-IM V2). These instruments measure conductivity and temperature; a pressure sensor is optional. They have 6 differential A/D channels and 1 RS-232 channel available for auxiliary sensors, which can be plugged into the CTD end cap.
The SBE 37 MicroCAT family includes CTDs that are integrated with a dissolved oxygen sensor at the factory.
- The SBE 19plus V2 SeaCAT, intended primarily for profiling applications, can also be used in moored mode. The 19plus V2 also has 6 differential A/D channels and 1 RS-232 channel available for auxiliary sensors. When in moored mode, it functions similar to a 16plus V2 with optional pressure sensor.
- The older versions of these products, the SBE 16 / 16plus / 16plus-IM and SBE 19 / 19plus, also accept auxiliary sensors.
See Product Selection Guide for a table summarizing the features of all our moored instruments.
Does it matter if I deploy my moored instrument, which includes a conductivity sensor, in a horizontal or vertical position?
Yes, vertical is usually preferable. In the presence of consistent currents and suspended sediment, we have seen instances where a horizontal conductivity cell is scoured by the abrasive effect of the flow. When scouring is particularly intense, the electrodes can be stripped of their electroplated platinum-black coating, driving the calibration toward fresher readings. Sedimentation (silting) in the cell also drives the readings fresh of correct.
Mounting the instrument vertically avoids abrasive flow and sediment build-up while allowing wave motions and Bernoulli pressures to flush the cell.
Note that some moored sensors (SBE 37-SIP, 37-SIP-IDO, 37-SMP, 37-SMP-IDO, 37-SMP-ODO, 37-IMP, 37-IMP-IDO, 37-IMP-ODO) have a recommended orientation because of their u-shaped plumbing configuration. Refer to the instrument manual for details.
How should I pick the pressure sensor range for my CTD? Would the highest range give me the most flexibility in using the CTD?
While the highest range does give you the most flexibility in using the CTD, it is at the expense of accuracy and resolution. It is advantageous to use the lowest range pressure sensor compatible with your intended maximum operating depth, because accuracy and resolution are proportional to the pressure sensor's full scale range. For example, the SBE 9plus pressure sensor has initial accuracy of 0.015% of full scale, and resolution of 0.001% of full scale. Comparing a 2000 psia (1400 meter) and 6000 psia (4200 meter) pressure sensor:
- 1400 meter pressure sensor ‑ initial accuracy is 0.21 meters and resolution is 0.014 meters
- 4200 meter pressure sensor ‑ initial accuracy is 0.63 meters and resolution is 0.042 meters
Is it necessary to put my instrument in water to test it? Will I destroy the conductivity cell if I test it in air?
It is not necessary to put the instrument in water to test it. It will not hurt the conductivity cell to be in air.
If there is a pump on the instrument, it should not be run for extended periods in air.
- Profiling instruments (SBE 9plus, 19, 19plus, 19plus V2, 25, 25plus, 49) and some moored instruments (all pumped MicroCATs with integral dissolved oxygen (DO), and pumped MicroCATs without DO with firmware 3.0 and later) do not turn on the pump unless the conductivity frequency is above a specified minimum value (minimum value is hard-wired in 9plus, user-programmable in other instruments). This prevents the pump from turning on in air. See the instrument manual for details.
- If your instrument does not check for conductivity frequency before turning on the pump:
- For moored SeaCATs (16, 16plus, 16plus-IM, 16plus V2, 16plus-IM V2): Disconnect the pump cable for the test.
- For older pumped MicroCATs: orient the MicroCAT to provide an upright U-shape for the plumbing. Then fill the inside of the pump head with water via the pump exhaust tubing; this will provide enough lubrication to prevent pump damage during brief testing.
I am ordering a CTD and want to use auxiliary sensors. Should I order them from Sea-Bird also, or deal directly with the sensors’ manufacturers?
This depends on your own expertise and resources. We have extensive experience in integrating and supporting a wide range of auxiliary sensors, but not everything under the sun. We have a large list of commonly used sensors that we routinely offer for sale (see Third Party Sensor Configuration).
When you purchase any of these auxiliary sensors from Sea-Bird, we are able to apply this experience to integrating the sensors with the CTD. The integration includes installing the sensors (with appropriate mounting kits and cables) in a manner that puts each sensor in the best possible orientation for optimum performance. It also includes configuring the CTD system and software to accept the sensors’ inputs and properly display the data, and testing the entire system, typically in a chilled saltwater bath overnight, to confirm proper operation. Having done the integration, we also support the entire system in terms of follow-on service and end-user support with operational and data analysis questions *. There is significant added value in our integration service, and there is some extra cost for this, compared to doing it yourself. However, we do not base our business on selling services, and the prices charged for Third Party sensors carry minimal mark-ups that vary depending on the pricing we are offered by the manufacturers. In some cases we can sell at the manufacturer's list price, and in others we have to add margin.
1. As described in our Warranty, auxiliary sensors manufactured by other companies are warranted only to the limit of the warranties provided by their original manufacturers (typically 1 year).
2. Click here for information on repairing / recalibrating auxiliary sensors manufactured by other companies.
Can I use a pressure sensor above its rated pressure?
Digiquartz pressure sensors are used in the SBE 9plus, 53, and 54. The SBE 16plus V2, 16plus-IM V2, 19plus V2, and 26plus can be equipped with either a Druck pressure sensor or a Digiquartz pressure sensor. All other instruments that include pressure use a Druck pressure sensor.
- The overpressure rating for a Digiquartz (as stated by Paroscientific) is 1.2 * full scale. The sensor will provide data values above 100% of rated full scale; however, Sea-Bird does not calibrate beyond the rated full scale.
- The overpressure rating for a Druck (as stated by Druck) is 1.5 * full scale. The sensor will provide data values above 100% of rated full scale; however, Sea-Bird does not calibrate beyond the rated full scale.
Note: If you use the instrument above the rated range, you do so at your own risk; the product will not be covered under warranty.
How often do I need to have my instrument and/or auxiliary sensors recalibrated? Can I recalibrate them myself?
- Profiling CTD — recalibrate once/year, but possibly less often if used only occasionally. We recommend that you return the CTD to Sea-Bird for recalibration. (In principle, it is possible for calibration to be performed elsewhere, if the calibration facility has the appropriate equipment andtraining. However, the necessary equipment is quite expensive to buy and maintain.) In between laboratory calibrations, take field salinity samples to document conductivity cell drift.
- Thermosalinograph — recalibrate at least once/year, but possibly more often depending on the degree of bio-fouling in the water.
- DO sensor —
— SBE 43 — recalibrate once/year, but possibly less often if used only occasionally and stored correctly (see Application Note 64), and also depending on the amount of fouling and your ability to do some simple validations (see Application Note 64-2)
— SBE 63 — recalibrate once/year, but possibly less often if used only occasionally and stored correctly and also depending on the amount of fouling and your ability to do some simple validations (see SBE 63 manual)
- pH sensor —
— SBE 18 pH sensor or SBE 27 pH/ORP sensor — recalibrate at the start of every cruise, and then at least once/month, depending on use and storage
— Satlantic SeaFET pH sensor — recalibrate at least once/year. See FAQ tab on Satlantic's SeaFET page for details (How often does the SeaFET need to be calibrated?).
- Transmissometer — usually do not require recalibration for several years. Recalibration at the manufacturer’s factory is the most practical method.
We often have requests from customers to have some way to know if the CTD is out of calibration. The general character of sensor drift in Sea-Bird conductivity, temperature, and pressure measurements is well known and predictable. However, it is very difficult to know precisely how far a CTD calibration has drifted over time unless you have access to a very sophisticated calibration lab. In our experience, an annual calibration schedule will usually maintain the CTD accuracy to within 0.01 psu in Salinity.
Conductivity drifts as a change in slope as a result of accumulated fouling that coats the inside of the conductivity cell, reducing the area of the cell and causing an under-reporting of conductivity. Fouling consists of both biological growth and accumulated oils and inorganic material (sediment). Approximately 95% of fouling occurs as the cell passes through oil and other contaminants floating on the sea surface. Most conductivity fouling is episodic, as opposed to gradual and steady drift. Most fouling events are small and mostly transitory, but they have a cumulative affect over time. A severe fouling event, such as deployment through an oil spill, could have a dramatic but only partially recoverable effect, causing an immediate jump shift toward lower salinity. As fouling becomes more severe, the fit becomes increasingly non-linear and offsets and slopes no longer produce adequate correction, and return to Sea-Bird for factory calibration is required. Frequently checking conductivity drift is likely to be the most productive data assurance measure you can take. Comparing conductivity from profile to profile (as a routine check) will allow you to detect sudden changes that may indicate a fouling event and the need for cleaning and/or re-calibration.
Temperature generally drifts slowly, at a steady rate and predictably as a simple offset at the rate of about 1-2 millidegrees per year. This is approximately equal to 1-2 parts per million in Salinity error (very small).
Pressure sensor drift is also an offset, and annual comparisons to an accurate barometer to determine offset will generally keep the sensor within specification for several years, particularly as the sensors age over time.
Do you recommend a particular brand of alkaline D-cell batteries?
For Sea-Bird instruments that use alkaline D-cells, Sea-Bird uses Duracell MN 1300, LR20. While rare, we have seen a few problems with cheaper batteries over the years: they are more likely to leak, may vary in size (leading to loose batteries causing a bad power connection), and may not last as long.
I want to add an auxiliary sensor to my CTD (SBE 9plus, 16, 16plus, 16plus-IM, 16plus V2, 16plus-IM V2, 19, 19plus, 19plus V2, 21, 25, or 25plus). Assuming the auxiliary sensor is compatible with the instrument, what is the procedure?
Adding the sensor(s) is reasonably straightforward:
- Mount the sensor; a poor mounting scheme can result in poor data.
Note: If the new sensor will be part of a pumped system, the existing plumbing must be modified; consult Sea-Bird for details.
- Attach the new cable.
- (not applicable to 9plus used with 11plus Deck Unit) Using the appropriate terminal program — Enable the channel(s) in the CTD, using the appropriate instrument command.
- Using Seasave V7 or SBE Data Processing — Modify the CTD configuration (.con or .xmlcon) file to reflect the new sensor, and type in the calibration coefficients.
How accurate is salinity measured by my CTD? What factors impact accuracy?
One of the reasons that this is not a simple question is that there are several factors to take into consideration regarding the error margin for practical salinity measurements. Salinity itself is a derived measurement from temperature, conductivity, and pressure, so any errors in these sensors can propagate to salinity. For example, our initial accuracy specification for the SBE 3plus temperature sensor and SBE 4 conductivity sensor on an SBE 9plus CTD is approximately equivalent to an initial salinity accuracy of 0.003 PSU (note that conductivity units of mS/cm are roughly equivalent in terms of magnitude to PSU).
However, another issue to consider is that this accuracy is defined for a clean, well-mixed calibration bath. In the ocean, some of the biggest factors that impact salinity accuracy are 1) sensor drift from biofouling or surface oils for conductivity in particular and 2) dynamic errors that can occur on moving platforms, particularly when conditions are rapidly changing, which will be true for all sensors that measure salinity. Sea-Bird provides recommendations, design features such as a pumped flow path, and data processing routines to align and improve data for the salinity calculation to account for thermal transients and hysteresis, and to match sensor response times. Depending on the environment and the steepness of the gradient, and after careful data processing, this may continue to have an impact on salinity on the order of 0.002 PSU or more, for example. For more details, see Application Note 82.
Lastly, note that salinity in PSU is calculated according to the Practical Salinity Scale (PSS-78), which is defined as valid for salinity ranges from 2 – 42 PSU.
Do I need to remove batteries before shipping my instrument for a deployment or to Sea-Bird?
Alkaline batteries can be shipped installed in the instrument. See Shipping Batteries for information on shipping instruments with Lithium or Nickel-Metal Hydride (NiMH) batteries.
Do I need to clean the exterior of my instrument before shipping it to Sea-Bird for calibration?
Remove as much biological material and/or anti-foul coatings as possible before shipping. Sea-Bird cannot place an instrument with a large amount of biological material or anti-foul coating on the housing in our calibration bath; if we need to clean the exterior before calibration, we will charge you for this service.
- To remove barnacles, plug the ends of the conductivity cell to prevent the cleaning solution from getting into the cell. Then soak the entire instrument in white vinegar for a few minutes. After scraping off the barnacles and marine growth, rinse the instrument well with fresh water.
- To remove anti-foul paint, use a Heavy Duty Scotch-Brite pad (http://www.3m.com/us/home_leisure/scotchbrite/products/scrubbing_scouring.html) or similar scrubbing device.
I want to change the pressure sensor on my CTD, swapping it as needed to get the best data for a given deployment depth. Can I do this myself, or do I need to send the instrument to Sea-Bird?
On most of our instruments, replacement of the pressure sensor should be performed at Sea-Bird. We cannot extend warranty coverage if you replace the pressure sensor yourself.
However, we recognize that you might decide to go ahead and do it yourself because of scheduling/cost issues. Some guidelines follow:
- Perform the swap and carefully store the loose sensor on shore in a laboratory or electronics shop environment, not on a ship. The pressure sensor is fairly sensitive to shock, and a loose sensor needs to be stored carefully. Dropping the sensor will break it.
- Some soldering and unsoldering is required. Verify that the pressure sensor is mounted properly in your instrument. Properly re-grease and install the o-rings, or the instrument will flood.
- Once the sensor is installed, back-fill it with oil. Sea-Bird uses a vacuum-back filling apparatus that makes this job fairly easy. We can provide a drawing showing the general design of the apparatus, which can be modified and constructed by your engineers.
- For the most demanding work, calibrate the sensor on a deadweight tester to ensure proper operation and calibration.
- Enter the calibration coefficients for the new sensor in:
- the CTD configuration (.con or .xmlcon) file, using Seasave V7 or SBE Data Processing, and
- (for an instrument with internally stored calibration coefficients) the CTD EEPROM, using the appropriate terminal program and the appropriate calibration coefficient commands
Note: This discussion does not apply to the SBE 25 (not 25plus), which uses a modular pressure sensor (SBE 29) mounted externally on the CTD. Swap the SBE 29 as desired, use the CC command in Seaterm or SeatermAF to enter the new pressure range and pressure temperature compensation value, and type the calibration coefficients for the new sensor into the CTD configuration (.con or .xmlcon) file in Seasave V7 or SBE Data Processing.
Can I brush-clean and replatinize the conductivity cell myself? How often should this be done?
Brush-cleaning and replatinizing should be performed at Sea-Bird. We cannot extend warranty coverage if you perform this work yourself.
The brush-cleaning and replatinizing process requires specialized equipment and chemicals, and the disassembly of the sensor. If performed incorrectly, you can damage the cell. Additionally, the sensor must be re-calibrated when the work is complete.
Sea-Bird determines whether brush-cleaning and replatinizing is required based upon how far the calibration has drifted from the original calibration. Typically, a conductivity sensor on a profiling CTD requires brush-cleaning and replatinizing every 5 years.
I sent my conductivity sensor to Sea-Bird for calibration, and you also performed a Cleaning and Replatinizing (C &P). You sent the instrument back with 2 sets of calibration data. What does this mean?
The post-cruise calibration contains important information for drift calculations. The post-cruise calibration is performed on the cell as we received it from you, and is an indicator of how much the sensor has drifted in the field. Information from the post-cruise calibration can be used to adjust your data, based on the sensor’s drift over time. See Application Note 31: Computing Temperature and Conductivity Slope and Offset Correction Coefficients from Laboratory Calibrations and Salinity Bottle Samples.
If the sensor has drifted significantly (based on the data from the post-cruise calibration), Sea-Bird performs a C & P to restore the cell to a state similar to the original calibration. After the C & P, the sensor is calibrated again. This calibration serves as the starting point for future data, and for the sensor’s next drift calculation.
The C & P tends to return the cell to its original state. However, there are many subtle factors that may result in the post-C & P calibration not exactly matching the original calibration. Basically, the old platinizing is stripped off and new platinizing is plated on. Anything in this process that alters the cell slightly will result in a difference from the original calibration. We compare the calibration after C & P with the original calibration, not to make any drift analysis, but to make sure we did not drastically alter the cell, or that the cell was not damaged during the C & P process.
|16||P-IM||.||1 – 600 m (plastic)||0 – none||1 – XSG/AG||0 – Inductive Modem||0 - none|
|2 – 7000 m (titanium)||1 – 20 m strain gauge||2 – MCBH||1 - SBE 5M|
|3 – 10,500 m (titanium)||2 – 100 m strain gauge||2 - SBE 5P/5T|
|3 – 350 m strain gauge|
|4 – 600 m strain gauge|
|5 – 1000 m strain gauge|
|6 – 2000 m strain gauge|
|7 – 3500 m strain gauge|
|8 – 7000 m strain gauge|
|9 – 10,500 m strain gauge|
|A – 45 psia Digiquartz|
|B – 100 psia Digiquartz|
|C – 200 psia Digiquartz|
|D – 300 psia Digiquartz|
|E – 400 psia Digiquartz|
|F – 1000 psia Digiquartz|
|G – 2000 psia Digiquartz|
|H – 3000 psia Digiquartz|
|I – 6000 psia Digiquartz|
|J – 10,000 psia Digiquartz|
|K – 15,000 psia Digiquartz|
Example: 16P-IM.28201 is an SBE 16plus-IM V2 with 7000 m housing, 7000 m strain gauge pressure sensor, MCBH connectors, Inductive Modem communications, and SBE 5M pump. See table below for description of each selection:
SeaCATplus Version 2 Conductivity & Temperature (pressure optional) Recorder with Inductive Modem. Includes 64 MB memory, 6 differential A/D channels (0 - 5 volt input range), 1 RS-232 data input channel, AF24173 Anti-Foulant Devices, Seasoft software, & complete documentation.
Communicating with 1 or more 16plus-IM V2s requires use of Sea-Bird inductive Modem Module (IMM) or Surface Inductive Modem (SIM), which provide serial interface between user’s computer & up to 100 IM instruments coupled to single cable. Purchase IMM/SIM & optional Inductive Cable Coupler (ICC) separately.
|SBE 16plus-IM V2 Housing (depth) Selections — MUST SELECT ONE|
|16P-IM.1xx0x||600 m plastic housing|
|16P-IM.2xx0x||7000 m titanium housing|
|16P-IM.3xx0x||10,500 m titanium housing||
Although 16plus-IM V2 is available with housing rated for 10,500 m, maximum transmission distance between Surface Inductive Modem (SIM) or Inductive Modem Module (IMM) and 16plus-IM V2 is rated only to 8000 m.
|SBE 16plus-IM V2 Pressure Sensor Selections — MUST SELECT ONE|
|16P-IM.x0x0x||No pressure sensor||Pressure sensor is installed in connector end cap, & is not field replaceable / swappable. While highest pressure rating gives you most flexibility in using 16plus-IM V2, it is at expense of accuracy & resolution. It is advantageous to use lowest range pressure sensor compatible with your intended maximum operating depth, because accuracy & resolution are proportional to pressure sensor's full scale range. For example, comparing 2000 & 7000 m sensors:
|16P-IM.x1x0x||20 m strain gauge pressure sensor|
|16P-IM.x2x0x||100 m strain gauge pressure sensor|
|16P-IM.x3x0x||350 m strain gauge pressure sensor|
|16P-IM.x4x0x||600 m strain gauge pressure sensor|
|16P-IM.x5x0x||1000 m strain gauge pressure sensor|
|16P-IM.x6x0x||2000 m strain gauge pressure sensor|
|16P-IM.x7x0x||3500 m strain gauge pressure sensor|
|16P-IM.x8x0x||7000 m strain gauge pressure sensor|
|16P-IM.x9x0x||10,500 m strain gauge pressure sensor|
|16P-IM.xAx0x||45 psia (20 m) Digiquartz pressure sensor with temperature compensation||Digiquartz pressure sensors provide better accuracy (0.02% of full scale range vs 0.1% of full scale range) & resolution (Digiquartz resolution dependent on user-programmable integration time) than strain gauge pressure sensors. See strain gauge options above for photo of pressure sensor port; when used with Digiquartz, nylon pressure capillary fitting screws into port.
Pressure sensor is installed in connector end cap, & is not field replaceable / swappable. While highest pressure rating gives you most flexibility in using 16plus-IM V2, it is at expense of accuracy & resolution. It is advantageous to use lowest range pressure sensor compatible with your intended maximum operating depth, because accuracy & resolution are proportional to pressure sensor's full scale range. For example, comparing 2000 psia (1400 m) & 6000 psia (4200 m) sensors:
|16P-IM.xBx0x||100 psia (60 m) Digiquartz pressure sensor with temperature compensation|
|16P-IM.xCx0x||200 psia (130 m) Digiquartz pressure sensor with temperature compensation|
|16P-IM.xDx0x||300 psia (200 m) Digiquartz pressure sensor with temperature compensation|
|16P-IM.xEx0x||400 psia (270 m) Digiquartz pressure sensor with temperature compensation|
|16P-IM.xFx0x||1000 psia (680 m) Digiquartz pressure sensor with temperature compensation|
|16P-IM.xGx0x||2000 psia (1,400 m) Digiquartz pressure sensor with temperature compensation|
|16P-IM.xHx0x||3000 psia (2,000 m) Digiquartz pressure sensor with temperature compensation|
|16P-IM.xIx0x||6000 psia (4,200 m) Digiquartz pressure sensor with temperature compensation|
|16P-IM.xJx0x||10,000 psia (6,800 m) Digiquartz pressure sensor with temperature compensation|
|16P-IM.xKx0x||15,000 psia (10,500 m) Digiquartz pressure sensor with temperature compensation|
|SBE 16plus-IM V2 Connector Selections — MUST SELECT ONE|
|16P-IM.xx10x||XSG/AG connectors on SeaCAT bulkhead connectors||
Wet-pluggable connectors may be mated in wet conditions. Their pins do not need to be dried before mating. By design, water on connector pins is forced out as connector is mated. However, they must not be mated or un-mated while submerged. Wet-pluggable connectors have a non-conducting guide pin to assist pin alignment & require less force to mate, making them easier to mate reliably under dark or cold conditions, compared to XSG/AG connectors. Like XSG/AG connectors, wet-pluggables need proper lubrication & require care during use to avoid trapping water in sockets.
|16P-IM.xx20x||Wet-pluggable (MCBH) connectors on SeaCAT bulkhead connectors|
|SBE 16plus-IM V2 Submersible Pump Selections — MUST SELECT ONE|
|16P-IM.xxx00||No pump||SBE 5M pump is intended for providing pumped conductivity only. Pump provides better conductivity response & anti-foulant protection than non-pumped configuration. SBE 5M pump with plastic housing is supplied for 16plus-IM V2 with 600 m housing; SBE 5M pump with titanium housing is supplied for 16plus-IM V2 with 7000 or 10,500 m housing.
Larger, more powerful SBE 5P or 5T is required if also planning to pump auxiliary sensors (such as dissolved oxygen, etc.). Operational characteristics of SBE 5P & 5T are identical. SBE 5P plastic pump is supplied for 16plus-IM V2 with 600 m housing; SBE 5T titanium pump is supplied for 16plus-IM V2 with 7000 or 10,500 m housing.
Pump bulkhead connector on 16plus-IM V2 is standard, so pump can be added in field without requiring any modifications to 16plus-IM V2. SBE 5M or 5P/5T selection includes pump (with same connector type as 16plus-IM V2), pump mount, & pump interface cable (cable compatible with connectors on 16plus-IM V2 and pump). See cable DN 30565 for XSG connectors, DN 32499 for wet-pluggable connectors.
|16P-IM.xxx01||Add SBE 5M pump for sensor flushing|
|16P-IM.xxx02||Add SBE 5P/5T pump for sensor flushing|
|SBE 16plus-IM V2 Mooring Wire Guide Size Selections (specify clamp to match O.D. of mooring wire jacket) — MUST SELECT ONE|
|50357.I||Wire guide and mounting clamp for 1/4 in. diameter mooring wire||
Cable fits loosely through IM coupling core / wire guide, & is clamped only at mounting clamp. This avoids putting through tension on end cap, which could pull off end cap. See document 67142. '.I' designation indicates that guide and clamp are to be installed on instrument at factory.
Thread for clamping to mooring cable:
Clamp Size Note: Mooring wire is typically specified by wire size, not by outer diameter (O.D.) of the mooring wire jacket. Verify the wire jacket O.D. before selecting the clamp size. The clamp size must be less than or equal to the wire jacket O.D. but larger than the wire diameter. For example, Mooring System Inc.’s specifications for 3x19 wire rope (in 2016) are as follows:
|50358.I||Wire guide and mounting clamp for 5/16 in. or 8 mm diameter mooring wire|
|50359.I||Wire guide and mounting clamp for 3/8 in. diameter mooring wire|
|50360.I||Wire guide and mounting clamp for 1/2 in. diameter mooring wire|
|50362.I||Wire guide and mounting clamp for 6 mm diameter mooring wire|
|50364.I||Wire guide and mounting clamp for 10 mm diameter mooring wire|
|50365.I||Wire guide and mounting clamp for 12 mm diameter mooring wire|
|50361.I||Wire guide and mounting clamp for 5/8 in. or 16 mm diameter mooring wire|
|SBE 16plus-IM V2 Dissolved Oxygen Sensor Options|
|16PIM-7g||SBE 63 Optical Dissolved Oxygen Sensor, with XSG connector, 600 m (cable & mount included, requires 16PIM-5f or -5b & 16P-IM.xx10)||SBE 63 is available in 7000 m titanium (16PIM-7e or -7f) or 600 m (16PIM-7g or -7h) housing, and its connector type (XSG or wet-pluggable) must match 16plus-IM V2 connector type.
SBE 63 is plumbed in line between conductivity sensor & pump; consequently, system requires more powerful SBE 5P plastic pump or SBE 5T titanium pump instead of SBE 5M pump . Operational characteristics of SBE 5P & 5T are identical.
All 16PIM-7 options include SBE 63, mount, & straight cable to connect sensor to 16plus-IM V2 bulkhead connector. If connecting 2 sensors to 1 bulkhead connector, extra charge to substitute Y-cable applies in addition to 16p-7_ price.
Additional sensors not listed here — fluorometers, transmissometers, turbidity meters, PAR sensors, etc. from third party manufacturers — are compatible with 16plus-IM V2. These sensors can be purchased from Sea-Bird & integrated with 16plus-IM V2 at our factory, or you can purchase mount kits & cables from Sea-Bird & perform integration yourself. See Third Party portion of price list.
|16PIM-7h||SBE 63 Optical Dissolved Oxygen Sensor with Wet-pluggable connector, 600 m (cable & mount included, requires 16PIM-5h or -5d & 16P-IM.xx20)|
|16PIM-7e||SBE 63 Optical Dissolved Oxygen Sensor with XSG connector, 7000 m housing with 5000 m mount (cable & mount included, requires 16PIM-5b & 16P-IM.xx10)|
|16PIM-7f||SBE 63 Optical Dissolved Oxygen Sensor with Wet-pluggable connector, 7000 m housing with 7000 m mount (cable & mount included, requires 16PIM-5d & 16P-IM.xx20)|
|16PIM-7i||SBE 63 Optical Dissolved Oxygen Sensor with XSG connector, 7000 m housing with 5000 m mount (cable & mount included, requires 16PIM-5b & 16P-IM.xx10)|
|16PIM-7j||SBE 63 Optical Dissolved Oxygen Sensor with Wet-pluggable connector, 7000 m housing with 7000 m mount (cable & mount included, requires 16PIM-5d & 16P-IM.xx20)|
|SBE 16plus-IM V2 Spares & Accessories|
|801542||AF24173 Anti-Foulant Device pair (spare, bagged, labeled for shipping)||Anti-foulant devices fit into anti-foulant device cups at each end of conductivity cell. Anti-foulant devices included with standard shipment; these are spares.
Useful life varies, depending on several factors. We recommend that customers consider more frequent replacement when high biological activity & strong current flow (greater dilution of anti-foulant concentration) are present. Moored instruments in high growth & strong dilution environments have been known to obtain a few months of quality data, while drifters that operate in non-photic, less turbid deep ocean environments may achieve years of quality data. Experience may be strongest determining factor in specific deployment environments.
|Anti-foulant cap without hose barb, black||Cap without hose barb is used for:
|Anti-Foulant cap with hose barb, black||Barbed cap is used for:
|80291||9-cell series alkaline battery pack (solder connected)||Batteries are easily accessed by unscrewing battery end cap. 16plus-IM V2 comes standard with 9 D cell alkaline batteries (nominal 14 Ah), but can be powered with Electrochem lithium batteries for more power intensive / longer deployments.
|801483||Battery pack assembly kit for 80547 9 D 10.8v/42Ah Lithium pack with instructions, cells not included (DN 67143)|
|801479||Battery pack assembly kit for 80540 3 DD 10.8v/30Ah Lithium pack with instructions, cells not included (DN 67144)|
|50323||SBE 16plus-IM V2 Spares Kit (XSG/AG connectors) - Complete support kit containing spare connectors, dummy plugs, Triton X-100, o-ring lubricant, & other mechanical spares & maintenance items.||Order appropriate spares kit for connector type on 16plus-IM V2:|
|50324||SBE 16plus-IM V2 Spares Kit (Wet-pluggable connectors) - Complete support kit containing spare connectors, dummy plugs, Triton X-100, o-ring lubricant, & other mechanical spares & maintenance items.|
|17133||Pump cable, RMG-2FS to RMG-2FS, 1.1 m (DN 30565)||Connects pump to 2-pin connector on 16plus-IM V2 end cap.|
|171503||Pump cable, Wet-pluggable connectors, MCIL-2FS to MCIL-2FS, 1.1 m (DN 32499)|
|Seacat/Searam battery endcap handle (DN 20220)|
|Seacat/Searam battery endcap lifting eye (DN 20217)|
|231787||Seacat connector guard, titanium (DN 21910)|
|Universal plumbing kit (includes pump air release valve, Y-fitting, & tubing) - Application Note 64-1||Application Note 64-1 details installation of plumbing for SBE 43 & pump on a CTD.|
|Cell filler/storage device with hose barbs (Application Note 34)||For cleaning conductivity cell after each use & storing instrument between uses. See document 67043 & Application Note 2D: Instructions for Care and Cleaning of Conductivity Cells.|
|various||Plumbing||For assorted sizes of Tygon tubing, see SBE 5M or 5T Configuration.|
|For Surface Inductive Modem (SIM), Inductive Modem Module (IMM), and Inductive Cable Coupler (ICC), see separate listings.|
Many cables, mount kits, and spare parts can be ordered online.
- 801880 To computer COM port from internal RS-232 connector for fast upload (digital firmware version > 2.2), DN 33447
- 171887 To computer COM port (from Surface Inductive Modem), (replaces 801373, DN 32431)
- 801583 To computer COM port (from Inductive Modem Module), 0.25 m, DN 33049
- 17133 To SBE 5M, 5T, or 5P (RMG connectors), 1.12 m, DN 30565
- 171503 To SBE 5M, 5T, or 5P (Wet-pluggable connectors), 1.12 m, DN 32499
- 172447 To SBE 43 (RMG/AG connectors), 1.1 m, DN 32496
- 172448 To SBE 43 (Wet-pluggable connectors), 1.1 m, DN 32654
- 17088 To SBE 63 (RMG connectors), 1.1 m, DN 30567
- 171792 To SBE 63 (Wet-pluggable connectors), 1.1 m, DN 32810
- 17610 To Biospherical QSP-200L or QSP-2300L (from AG connector), 2 m, DN 30701
- 17602 To Chelsea AquaTracka or AlphaTracka (from AG connector), 1.2 m, DN 31253
- 17361 To D&A OBS-3 (from AG connector), 0.76 m, DN 30954
- 172130 To D&A OBS-3+ (from AG connector), High & Low range, 1 m, DN 33080
- 172131 To D&A OBS-3+ (from Wet-pluggable connector), High & Low range, 1 m, DN 33081
- 172109 To D&A OBS-3+ (from AG connector), Low range (1X), 1 m, DN 33058
- 172111 To D&A OBS-3+ (from Wet-pluggable connector), Low range (1X), 1 m, DN 33060
- 172110 To D&A OBS-3+ (from AG connector), High range (4X), 1 m, DN 33059
- 172112 To D&A OBS-3+ (from Wet-pluggable connector), High range (4X), 1 m, DN 33061
- 171099 To Seapoint fluorometer or turbidity meter (1X) (from AG connector), 1.1 m, DN 32073
- 171147 To Seapoint fluorometer or turbidity meter (3X/5X) (from AG connector), 1.1 m, DN 32101
- 172221 To Seapoint fluorometer or turbidity meter (10X/20X) (from AG connector), 1.1 m, DN 31933
- 171845 To Seapoint fluorometer or turbidity meter (30X/100X) (from AG connector), 1.1 m, DN 31924
- 171908 To Turner Cyclops-7 (1X) (from AG connector), 1.1 m, DN 32910
- 171907 To Turner Cyclops-7 (10X) (fromAG connector), 1.1 m), DN 32909
- 171909 To Turner Cyclops-7 (100X) (from AG connector), 1.1 m, DN 32911
- 171418 To Turner SCUFA (from AG connector), 1.1 m, DN 32417
- 17876 To WET Labs C-Star or WETStar with old-style 4-pin connector (from AG connector), 1.1 m, DN 31725
- 171953 To WET Labs ECO-AFL, ECO-FL, C-Star, or WETStar with new-style 6-pin connector (from AG connector), 1.1 m, DN 32491
- 172437 To WET Labs ECO-AFL, ECO-FL, C-Star, or WETStar with new-style 6-pin connector (from Wet-pluggable connector), 1.1 m, DN 32853
- 171869 To WET Labs ECO-FL-NTUS or ECO-FL-NTU(RT) (from AG connector), 1.1 m, DN 32812
- 172285 To WET Labs ECO-FL-NTUS or ECO-FL-NTU(RT) (from Wet-pluggable connector), 1.1 m, DN 32846
- 172880 To WET Labs Triplet or Triplet-W (from AG connector), 1.1 m, DN 33673
- 172815 To WET Labs Triplet or Triplet-W (from Wet-pluggable connector), 1.1 m, DN 33622
To Mooring cable (document 67142 for all sizes)
- 50357 SBE 16plus-IM or 16plus-IM V2 Cable Clamp Kit, 1/4-inch diameter
- 50358 SBE 16plus-IM or 16plus-IM V2 Cable Clamp Kit, 5/16-inch or 8-mm diameter
- 50359 SBE 16plus-IM or 16plus-IM V2 Cable Clamp Kit, 3/8-inch diameter
- 50360 SBE 16plus-IM or 16plus-IM V2 Cable Clamp Kit, 1/2-inch diameter
- 50361 SBE 16plus-IM or 16plus-IM V2 Cable Clamp Kit, 5/8-inch or 16-mm diameter
- 50362 SBE 16plus-IM or 16plus-IM V2 Cable Clamp Kit, 6-mm diameter
- 50364 SBE 16plus-IM or 16plus-IM V2 Cable Clamp Kit, 10-mm diameter
- 50365 SBE 16plus-IM or 16plus-IM V2 Cable Clamp Kit, 12-mm diameter
Clamp Size Note: Mooring wire is typically specified by wire size, not by outer diameter (O.D.) of the mooring wire jacket. Verify the wire jacket O.D. before selecting the clamp size. The clamp size must be less than or equal to the wire jacket O.D. but larger than the wire diameter. For example, Mooring System Inc.’s specifications for 3x19 wire rope (in 2016) are as follows:
|Wire Diameter||Jacket Diameter||Recommended Sea-Bird Clamp|
|3/16 inch (5.0 mm)||0.255 inch (6.5 mm)||1/4 inch|
|1/4 inch (6.5 mm)||0.330 inch (8.4 mm)||5/16 inch|
|5/16 inch (8.0 mm)||0.392 inch (9.9 mm)||3/8 inch|
|3/8 inch (9.5 mm)||0.453 inch (11.5 mm)||10 mm (0.394 inch)|
|7/16 inch (11.1 mm)||0.5 inch (12.7 mm)||1/2 inch|
- 801483 9D (10.8 V / 42 AH) lithium battery pack kit (document 67143) — see notes below.
- 801479 3DD (10.8 V / 30 AH) lithium battery pack kit (document 67144) — see notes below.
1. Batteries not included.
2. Lithium battery packs cannot be used with a 16plus, 16plus-IM, 16plus V2, or 16plus-IM V2 that is integrated with SBE 5T or 5P pump, because of current limitations. They can be used with an instrument with no pump, or with an SBE 5M pump.
Hardware, O-ring, & Mounting Kits
- 60021 Battery end cap hardware & O-ring kit for SBE 16/16plus/16plus-IM/16plus V2/16plus-IM V2, 17plus, 19/19plus/19plus V2, 25, 26/26plus, 53, 54, 55, or AFM (document 67042)
- 50274 O-ring kit for SBE 16plus, 16plus-IM, 16plus V2, 16plus-IM V2, 19plus, or 19plus V2 (document 67102)
- 50273 Hardware kit for SBE 16plus, 16plus-IM, 16plus V2, 16plus-IM V2, 19plus, or 19plus V2 (document 67103)
- 90087 CTD plumbing kit (document 67108)
- varies Cable clamp kit for SBE 37-IM, 37-IMP, 16plus-IM, 16plus-IM V2, 44, or UIMM (document 67142)
- 50323 Seaspares kit for SBE 16plus-IM or 16plus-IM V2 with XSG/AG connectors (hardware, O-rings, dummy plugs, connectors, etc.) (document 67132)
- 50324 Seaspares kit for SBE 16plus-IM or 16plus-IM V2 with wet-pluggable connectors (hardware, O-rings, dummy plugs, connectors, etc.) (document 67133)
- 801542 AF24173 Anti-Foulant Device (pair, bagged, labeled for shipping)
- 233186 High-head pressure port plug for muddy/biologically productive environments (for instrument with Druck pressure sensor) (Application Note 84)
Compare Moored / Time Series Recording Instruments
(C, T, P)
|SBE 16plus V2 SeaCAT C-T (P) Recorder||C, T, P*||6 A/D; 1 RS-232||64 Mb||RS-232||Optional pump|
|SBE 16plus SeaCAT C-T (P) Recorder
||C, T, P*||4 A/D; optional RS-232 or PAR||8 Mb||RS-232 or -485||Replaced by SBE 16plus V2 in 2008|
|SBE 16 SeaCAT C-T (P) Recorder
||C, T, P*||4 A/D||1 Mb||RS-232||Replaced by SBE 16plus in 2001|
|SBE 16plus-IM V2 SeaCAT C-T (P) Recorder||C, T, P*||6 A/D; 1 RS-232||64 Mb||Inductive Modem||Optional pump|
|SBE 16plus-IM SeaCAT C-T (P) Recorder
||C, T, P*||4 A/D; optional RS-232 or PAR||8 Mb||Inductive Modem||Replaced by SBE 16plus-IM V2 in 2008|
|SBE 19plus V2 SeaCAT Profiler CTD||C, T, P||6 A/D;
|64 Mb||RS-232||Programmable mode — profiling or moored|
|SBE 19plus SeaCAT Profiler CTD
||C, T, P||4 A/D; optional PAR||8 Mb||RS-232||Replaced by SBE 19plus V2 in 2008|
|SBE 19 SeaCAT Profiler CTD
||C, T, P||4 A/D||1 - 8 Mb||RS-232||Replaced by SBE 19plus in 2001|
|SBE 37-SM MicroCAT C-T (P) Recorder||C, T, P*||8 Mb||RS-232 or -485|
|SBE 37-SMP MicroCAT C-T (P) Recorder||C, T, P*||8 Mb||RS-232, RS-485, or SDI-12||Integral pump|
|SBE 37-SMP-IDO MicroCAT C-T-DO (P) Recorder||C, T, P*||Integrated DO||8 Mb||RS-232 or -485||Integral pump; Replaced by SBE 37-SMP-ODO in 2014|
|SBE 37-SMP-ODO MicroCAT C-T-DO (P) Recorder||C, T, P*||Integrated Optical DO||8 Mb||RS-232, RS-485, or SDI-12||Integral pump|
|HydroCAT C-T-(DO)-(P) Recorder||C, T, P*||Integrated Optical DO*||8 Mb||RS-232 & SDI-12||Integral pump; for Coastal applications to 350 m|
|C, T, P*||Integrated pH, Optical DO*, Chlorophyll*, Turbidity*||16 Mb||RS-232 & SDI-12||Integral pump; for Coastal applications to 350 m|
|SeapHOx Ocean C-T-DO-pH (P) Recorder||C, T, P*||Integrated Optical DO, pH||8 Mb||RS-232||37-SMP-ODO with SeaFET pH sensor; to 50 m|
|Deep SeapHOx Ocean C-T-DO-pH (P) Recorder||C, T, P*||Integrated Optical DO, pH||8 Mb||RS-232||37-SMP-ODO with Deep SeaFET pH sensor; to 2000 m|
|SBE 37-IM MicroCAT C-T (P) Recorder||C, T, P*||8 Mb||Inductive modem|
|SBE 37-IMP MicroCAT C-T (P) Recorder||C, T, P*||8 Mb||Inductive modem||Integral pump|
|SBE 37-IMP-IDO MicroCAT C-T-DO (P) Recorder||C, T, P*||Integrated DO||8 Mb||Inductive modem||Integral pump; Replaced by SBE 37-IMP-ODO in 2014|
|SBE 37-IMP-ODO MicroCAT C-T-DO (P) Recorder||C, T, P*||Integrated Optical DO||8 Mb||Inductive modem||Integral pump|
|SBE 37-SI MicroCAT C-T (P) Recorder||C, T, P*||8 Mb||RS-232 or -485|
|SBE 37-SIP MicroCAT C-T (P) Recorder||C, T, P*||8 Mb||RS-232 or -485||Integral pump|
|C, T, P*||Integrated DO||8 Mb||RS-232 or -485||Integral pump|
|SBE 39plus Temperature (P) Recorder||T, P*||64 Mb||Optional||USB & RS-232||Optional|
|SBE 39 Temperature (P) Recorder
||T, P*||32 Mb||Optional||RS-232||Optional||Replaced by SBE 39plus in 2014|
|SBE 39plus-IM Temperature (P) Recorder||T, P*||64 Mb||Inductive Modem & USB|
|SBE 39-IM Temperature (P) Recorder||T, P*||32 Mb||Inductive modem||Replaced by SBE 39plus-IM in 2016|
|SBE 56 Temperature Logger||T||64 Mb||USB|
|SBE 26plus Seagauge Wave & Tide Recorder||T, P||C optional||32 Mb||RS-232||
(tides, waves, & wave statistics)
|Wave & tide recorder|
|SBE 26 Seagauge Wave & Tide Recorder
||T, P||C optional||8 Mb||RS-232||Replaced by SBE 26plus in 2004|
|SBE 53 BPR Bottom Pressure Recorder||T, P||C optional||32 Mb||RS-232||Bottom pressure recorder|
|SBE 54 Tsunameter Tsunami Pressure Sensor||T, P||128 Mb||Optional||RS-232||Tsunami pressure sensor|
C = conductivity, T = temperature, P = pressure, DO = dissolved oxygen
Compare Inductive Modem Instruments
(C, T, P)
|SBE 16plus-IM V2 SeaCAT C-T (P) Recorder||C, T, P*||6 A/D; 1 RS-232||64 Mb||Optional pump|
|SBE 16plus-IM SeaCAT C-T (P) Recorder
||C, T, P*||4 A/D; optional RS-232 or PAR||8 Mb||Replaced by SBE 16plus-IM V2 in 2008|
|SBE 37-IM MicroCAT C-T (P) Recorder||C, T, P*||8 Mb|
|SBE 37-IMP MicroCAT C-T (P) Recorder||C, T, P*||8 Mb||Integral pump|
|SBE 37-IMP-IDO MicroCAT C-T-ODO (P) Recorder||C, T, P*||Integrated DO||8 Mb||Integral pump; Replaced by SBE 37-IMP-ODO in 2014|
|SBE 37-IMP-ODO MicroCAT C-T-ODO (P) Recorder||C, T, P*||Integrated Optical DO||8 Mb||Integral pump|
|SBE 39plus-IM Temperature (P) Recorder||T, P*||64 Mb||Includes internal USB connector for fast data upload|
|SBE 39-IM Temperature (P) Recorder||T, P*||32 Mb||Replaced by SBE 39plus-IM in 2016|
|SBE 44 Underwater Inductive Modem (UIM)||1 RS-232||30 Kb buffer||Integrates sensor with standard serial interface (current meter, Doppler profiler, etc.) to inductive modem telemetry system|
|Underwater Inductive Modem Module (UIMM)||1 RS-232||16 Kb Sample Data Memory||Integrates sensor with standard serial interface (current meter, Doppler profiler, etc.) to inductive modem telemetry system; more flexible and economical than SBE 44|
C = conductivity, T = temperature, P = pressure, DO = dissolved oxygen