SBE 4 Conductivity Sensor

Frequency-output conductivity sensor, for use on SBE 25 and 25plus Sealogger and SBE 9plus profiling CTDs or for fixed-site applications. (SBE 4C shown; SBE 4M does not include Quick disconnect)

The SBE 4 conductivity sensor is a modular, self-contained instrument that measures conductivity from 0 to 7 S/m, covering the full range of lake and oceanic applications. The sensor has electrically isolated power circuits and optically coupled outputs to eliminate any possibility of noise and corrosion caused by ground loops. Interfacing is also simplified by the square-wave variable frequency output signal (nominally 2.5 to 7.5 kHz, corresponding to 0 to 7 S/m). The sensor offers improved temperature compensation, smaller fit residuals, and faster turn-on stabilization times.

Because of the SBE 4’s low noise characteristics, hybrid frequency measuring techniques (used in Sea-Bird’s CTD instruments) provide rapid sampling with very high temporal and spatial resolution. The SBE 4 is ideally suited for obtaining vertical data with lowered systems or horizontal data with towed systems. Because of its small size, it is especially useful for moorings, portable CTD systems, or through-the-ice work.

The SBE 4C is a primary sensor for the SBE 9plus, 25, and 25plus profiling CTDs; it has a quick-disconnect fitting to simplify plumbing to the CTD pump. The SBE 4M, intended for long-term moored deployments, is supplied without the quick-disconnect fitting.

FEATURES

  • Cylindrical flow-through borosilicate glass cell with three internal platinum electrodes. The electrode arrangement offers distinct advantages over inductive or open external field cells. Because the outer electrodes are connected, electric fields are confined inside the cell, making the measured resistance (and instrument calibration) independent of calibration bath size or proximity to protective cages or other objects. The cell resistance controls the output frequency of a Wien Bridge oscillator circuit. A unique Sea-Bird design feature introduces a fixed conductivity offset, permitting the SBE 4 to measure conductivity down to 0 for fresh water work.
  • Built-in acquisition circuits and frequency outputs; allows for calibration as separate modules.
  • Each sensor calibrated over the range of 2.6 to 6 S/m in a computer-controlled bath, using natural seawater; a water sample at each point is compared to IAPSO seawater using a Guildline AutoSal.
  • 3400 or 6800 m aluminum, or 10,500 m titanium housing.
  • Five-year limited warranty.

OPTIONS

  • SBE 4C for profiling applications to 6800 or 10,500 m, or SBE 4M for moored applications to 3400 or 10,500 m.
  • Aluminum (3400 or 6800 m) or titanium (10,500 m) housing.
  • XSG or wet-pluggable MCBH connector.

CALIBRATION EQUATION

A least-squares fitting technique (including a zero conductivity point in air) yields calibration coefficients for use in the following equation:

Conductivity [S/m] = ( g + hf 2 + if 3+ jf 4 ) / 10 (1 + dt + ep)

where f is instrument frequency [kHz], t is temperature [°C], p is pressure [decibars], and d is thermal coefficient of expansion (3.25 x 10 -06) and e is bulk compressibility (-9.57 x 10 -08) of the borosilicate cell. The resulting coefficients g, h, i, and j are listed on the calibration certificate. Residuals are typically less than 0.0002 S/m.

Example Calibration Data (sensor serial number 2020, 30 May 1997)

Practical Salinity Scale 1978: C(35,15,0) = 4.2914 [S/m]

g = -1.05697877e+01    h = 1.42707291e+00    i = -4.32023820e-03    j = 4.53455585e-04

Bath Temperature
(°C 68)
Bath Salinity
(ppt)
Bath Conductivity
(S/m)
Instrument Frequency
(kHz)
Instrument Conductivity
(S/m)
Residual
[Instrument - Bath]
(S/m)
0.0000 0.0000 0.0000 2.72957 0.0000 0.0000
1.3428 35.2722 2.80855 5.22318 2.80850 -0.00005
1.0942 35.2724 3.01943 5.36370 3.01947 0.00004
15.2226 35.2731 4.34337 6.17207 4.34338 0.00001
18.6914 35.2731 4.69132 6.36724 4.69135 0.00003
29.0800 35.2708 5.77613 6.93974 5.77603 -0.00010
32.6309 35.2657 6.15878 7.13053 6.15885 0.00007

 

Performance

Measurement Range 0.0 to 7.0 S/m
Initial Accuracy 1 ± 0.0003 S/m
Stability 2 0.0003 S/m/month
Resolution 3 0.00004 S/m at 24 Hz
Response Time 4 0.060 sec (pumped)
Settling Time < 0.7 sec to within 0.0001 S/m

1 Typical specifications, referenced to NIST-traceable calibration.
2 Not applicable in areas of high biofouling activity or highly contaminated waters, or if Application Note 2D procedures are not followed.
3 Achieved with SBE 911plus CTD. In custom applications, resolution depends on frequency measuring technique.
4 Time to reach 63% of final value following a step change in conductivity.

Electrical

Input Power 6 - 24 VDC; 18 mA at 6V, 12 mA at 10 - 24 V
Output Signal 1 V square wave capacitively coupled

 

Mechanical

6061-T6 Aluminum housing Depth rating: 3400 m; Weight: 0.7 kg in air; 0.3 kg in water
7075-T6 Aluminum housing Depth rating: 6800 m; Weight: 0.7 kg in air; 0.3 kg in water
6Al-4V Titanium housing Depth rating: 10,500 m; Weight: 1.1 kg in air; 0.7 kg in water

 

 

The list below includes (as applicable) the current product brochure, manual, and quick guide; software manual(s); and application notes.

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, Oour 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.

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.

How often do I need to have my instrument and/or auxiliary sensors recalibrated? Can I recalibrate them myself?

General recommendations:

  • 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.

Profiling CTDs:

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 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.

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.

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 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:

  1. Thoroughly clean the connector with water, followed by alcohol.
  2. 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.

Replacing Connectors:

  • 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 storing sensors at low temperatures, and deploying at low temperatures or in frazil or pancake ice?

General

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.

Conductivity Cell

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.

Temperature Sensor

In general, neither the accuracy of the temperature measurement nor the survival of the temperature sensor will be affected by ice.

Oxygen Sensor

For the SBE 43 and SBE 63 Dissolved Oxygen sensor, avoid prolonged exposure to freezing temperature, including during shipment. Do not store the 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.

What is the function of the zinc anode on some instruments?

A zinc anode attracts corrosion and prevents aluminum from corroding until all the zinc is eaten up. Sea-Bird uses zinc anodes on an instrument if it has an aluminum housing and/or end cap. Instruments with titanium or plastic housings and end caps (for example, SBE 37 MicroCAT) do not require an anode.

Check the anode(s) periodically to verify that it is securely fastened and has not been eaten away.

Order SBE 4C (for use with a profiling CTD) or SBE 4M (for use on a mooring).

Family Model . Housing Connector Miscellaneous (factory use)
04 C – Quick Connect . 1 - 3400 m (aluminum; 4M only) 1 – XSG x
  M – Moored   2 – 6800 m (aluminum; 4C only) 2 – MCBH  
      3 – 10,500 m (titanium)    

Example: 04C.21x is an SBE 4C with 6800 m housing and XSG connector. See table below for description of each selection:

PART # DESCRIPTION NOTES
4C CTD CONDUCTIVITY SENSOR - Modular sensor (square wave output and isolated electronics), range 0 - 7 S/m, used with pumped CTDs. Includes complete documentation. SBE 4C is standard conductivity sensor supplied with SBE 9plus, 25, or 25plus CTD. Because it is typically used with a CTD, it is shipped with a Quick disconnect installed, making attachment to CTD plumbing quick & easy.
SBE 4C is shipped with Tygon tubing looped end-to-end around conductivity cell, to prevent dust & dirt from entering cell. SBE 4C is shipped dry to prevent conductivity cell damage from freezing.
See SBE 4M below for conductivity sensor without Quick disconnect.
SBE 4C Housing (depth rating) Selections — MUST SELECT ONE
4C.2xx Aluminum housing, 6800 meter depth rating  
4C.3xx Titanium housing, 10,500 meter depth rating  
SBE 4C Connector Selections — MUST SELECT ONE
04C.x1x XSG connector

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.

    

04C.x2x Wet-pluggable (MCBH) connector
SBE 4C Spares & Accessories (items available for purchase online by U.S. customers are marked with a 'Buy Now' link)
17086 SBE 4 (Cond) or SBE 3 (Temp) to SBE 9plus/25 interface cable, RMG-3FS to RMG-3FS, 0.63 m (DN 30566) Cable for connecting SBE 3plus or 3F Temperature Sensor or SBE 4C Conductivity Sensor to SBE 9plus, 25, or 25plus CTD. Connector type must match sensor and CTD.
171669 SBE 4 (Cond) or SBE 3 (Temp) to SBE 9plus/25 interface cable, MCIL-3FS to MCIL-3FS, 0.7 m (DN 32671)
50083.1 Aluminum TC Sensor Mounting Kit for SBE 9plus For mounting SBE 3plus or 3F Temperature Sensor and SBE 4C Conductivity Sensor on SBE 9plus, 25, or 25plus CTD.
90085
Buy Now
TC duct & plumbing kit for user installation (includes documentation) See Application Note 15: TC Duct Assembly and Plumbing Installation for details.
23557
Buy Now
Quick disconnect connector, for 7/16" diameter tubing (connects to conductivity cell) 23557 mounts to tube fitting & connects to end of SBE 4C conductivity cell. When used with 23555 (below), provides quick disconnect for removing plumbing from conductivity cell (used on SBE 9plus, 25, or 25plus CTD).
23555
Buy Now
Quick disconnect connector, for 1/2" diameter tubing (inserts into Tygon tubing) 23555 snaps onto 23557 & attaches to Tygon tube plumbing, providing quick disconnect for removing plumbing from SBE 4C conductivity cell (used on SBE 9plus, 25, or 25plus CTD).

 

 

PART # DESCRIPTION NOTES
4M MOORED CONDUCTIVITY SENSOR - Modular sensor (square wave output and isolated electronics), range 0 - 7 S/m. Includes complete documentation. Supplied without quick disconnect fittings.

SBE 4M is shipped with Tygon tubing looped end-to-end around conductivity cell, to prevent dust & dirt from entering cell. SBE 4M is shipped dry to prevent conductivity cell damage from freezing.
See SBE 4C above for conductivity sensor with a Quick disconnect feature, intended for easy attachment to plumbing in SBE 9plus, 25, or 25plus CTD.

SBE 4M Housing (depth rating) Selections — MUST SELECT ONE
04M.1xx Aluminum housing, 3400 meter depth rating  
04M.3xx Titanium housing, 10,500 meter depth rating  
SBE 4M Connector Selections — MUST SELECT ONE
04M.x1x XSG connector

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.

    

04M.x2x Wet-pluggable (MCBH) connector
SBE 4M Spares & Accessories (items available for purchase online by U.S. customers are marked with a 'Buy Now' link)
50315
Buy Now
Anti-foul holder kit - installs on SBE 4, & SeaCATs (not SeaCATplus) to allow use of AF24173 in place of obsolete 24012 Anti-Foulant Devices. Order AF24173 separately.

50315 provides fittings (2) to hold AF24173 Anti-Foulant Devices at each end of conductivity cell. See Application Note 70: Installing Anti-Foulant Device Mount Kit on SBE 4, 16, 19, and 21 Conductivity Cells.

  • SBE 4Ms shipped with optional Anti-Foulant Devices for moored applications before 2002 used a smaller anti-foulant device inside Tygon tubing that attached to end of conductivity cell, & did not include 50315. For those SBE 4Ms, order 50315 & 801542 first time you need new Anti-Foulant Devices. Once you have 50315, order 801542 AF24173 Anti-Foulant Devices as needed.
  • SBE 4Ms shipped with optional Anti-Foulant Devices for moored applications after 2002 include 50315 installed on SBE 4M. Order 801542 AF24173 Anti-Foulant Devices as needed.

 

801542 AF24173 Anti-Foulant Device pair (spare, bagged, labeled for shipping)
50286
Buy Now
SBE 4 mounting bracket for SBE 26/26plus/53

SBE 4M can be used to provide optional conductivity for SBE 26 / 26plus Wave & Tide Recorder or SBE 53 BPR Bottom Pressure Recorder. 50286 mounts SBE 4M on 26/26plus/53. 17695 provides interface if instruments have RMG connectors; 171752 provides interface if instruments have wet-pluggable connectors.

  • SBE 4M, mounting bracket, & interface cable are included with 26plus if 26plus is ordered with option 26p-3c.
  • SBE 4M, mounting bracket, & interface cable are included with SBE 53 if SBE 53 is ordered with option 53-3a.
17695 SBE 4 to SBE 26/26plus/53 interface cable (RMG-3FS to RMG-3FS), 0.3 m (DN 30566)
171752 SBE 4 to SBE 26/26plus/53 interface cable, Wet-pluggable (MCIL-3FS to MCIL-3FS), 0.3 m (DN 32671)

 

Many cables, mount kits, and spare parts can be ordered online.

Cables

  • 17086 To SBE 9plus, 25, or 25plus (RMG connectors), 0.64 m, DN 30566
  • 171669 To SBE 9plus, 25, or 25plus (Wet-pluggable connectors), 0.76 m, DN 32671
  • 17029, 3-pin pigtail cable (RMG-3FS with lock sleeve), 0.5 m, DN 30580
  • 17030, 3-pin pigtail cable (RMG-3FS with lock sleeve), 2.4 m, DN 30580
  • 171638, 3-pin pigtail cable, Wet-pluggable (MCIL-3FS with MCDSL-F), 2.4 m, DN 32646

Mount Kits

  • To SBE 9plus (vertical only)
    50083 Aluminum Mount Kit (contains 50084 and 50085)
    50084 Aluminum TC Sensor Mount Block Assembly
    50085 Aluminum TC Sensor Mount Bar Assembly
  • To SBE 9plus Aluminum (vertical or horizontal)
    50083.1 Aluminum Mount Kit (contains 50084.1 and 50085.1)
    50084.1 Aluminum TC Sensor Mount Block Assembly
    50085.1 Aluminum TC Sensor Mount Bar Assembly
  • To SBE 9plus Titanium (vertical or horizontal)
    50131 Titanium TC Sensor Mount Kit (contains 50132 and 50084.2)
    50132 Titanium TC Sensor Mount Bar Assembly
    50084.2 Titanium TC Sensor Mount Block Assembly
  • To SBE 25 or 25plus
    23306 TC Mount Block (DN 20314), and
    23385 Retainer Strap (DN 20382)
  • To SBE 26, 26plus, or 53
    50286 SBE 4 Mounting Bracket
  • To SBE 32C
    50216  Multi-sensor mount kit to mount SBE 3, 4, and 5 (document 67013)

Spare Parts

  • 801542 AF24173 Anti-Foulant Device (pair, bagged, labeled for shipping)
  • 50315 Anti-foul holder kit -- installs on SBE 4 & SeaCATs (not SeaCATplus) to allow use of AF24173 in place of obsolete 24012 Anti-Foulant Devices. Order AF24173 separately. (see Application Note 70)
  • 50033 O-ring kit for SBE 4 (document 67067)
  • 50246 O-ring kit for SBE 4 Quick Disconnect
  • 23548 Zinc anode ring for end cap