Brochure/specifications in pdf format Manual Reference Sheet Configuration options & accessories
DESCRIPTION
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The SBE 16plus-IM V2 (Version 2) SEACAT is a high-accuracy conductivity and temperature recorder (pressure is optional) with built-in Inductive Modem. The V2 is the most versatile successor in the line of SEACAT Recorders begun with the original SBE 16 SEACAT in 1987.
Compared to the previous SBE 16plus-IM, the 16plus-IM V2 incorporates an electronics upgrade and additional features. The V2 has two additional (six total) differentially amplified A/D input channels, FLASH memory is increased from 8 to 64 MB, and one RS-232 data input channel is added. Data can be output in XML as well as ASCII and HEX formats.
The inductive modem provides reliable, low-cost, real-time data transmission using plastic-coated wire rope (typically 3 x 19 galvanized steel) as both the transmission line and mooring tension member. IM instruments clamp anywhere along the rugged mooring wire. Expensive and potentially unreliable multi-conductor electrical cables with fixed position underwater connectors are not required. IM moorings are easily reconfigured for changing deployments (positions can be changed or instruments added or removed), by sliding and re-clamping sensors on the cable. Inductive modem systems are much less expensive and more power-efficient than acoustic modems, and offer reliable communication over greater distances.
In a typical real-time surface mooring, a Surface Inductive Modem (SIM) housed in the buoy communicates with the underwater IM instruments and is interfaced to a computer or data logger via an RS-232 serial port. The computer or data logger (not supplied by Sea-Bird) is programmed to poll each IM instrument on the mooring for its data, assemble all the instrument data into files, and send the files to a telemetry transmitter (satellite link, cell phone, RF modem, etc.). The 16plus-IM V2 simultaneously saves it data in memory for upload after recovery, providing a backup against lost data in the event real-time telemetry is interrupted.
The SBE 16plus-IM V2 uses the same temperature and conductivity sensors (and optional silicon strain gauge or Digiquartz® pressure sensors) proven in 10,000 SEACATs and MicroCATs. Calibration coefficients are stored in memory, permitting data output in ASCII engineering units (degrees C, Siemens/m, decibars, salinity [PSU], sound velocity [m/sec.], etc.). The sample interval, ranging from 10 to 14,400 seconds, is user-programmable in 1-second increments. Between samples, the 16plus-IM V2 powers down, drawing only 140 microamps. Alkaline D-cells provide power for approximately 290,000 samples of C and T, depending on the sampling and telemetry schedule. Six differentially amplified A/D input channels and one RS-232 channel provide conditioned power (500 ma) for, and obtain data from, optional auxiliary sensors (oxygen, turbidity, fluorescence, etc.).
COMMUNICATIONS AND INTERFACING
Both ends of the jacketed (insulated) wire rope connecting the buoy to its anchor are grounded to seawater via metal connection terminals (eyes) swaged to its steel core. This completes a conductive loop through the wire rope and the water. An Inductive Cable Coupler (ICC) serves as a coupling transformer similar to the one built into the SBE 16plus-IM V2, but clamped to the jacketed mooring wire just under the buoy, and connects to the SIM (SIM and ICC available separately). Commands and data are transmitted half-duplex between the SIM and 16plus-IM V2 using DPSK (differential-phase-shift-keyed) telemetry. DPSK telemetry provides a high degree of immunity from "fish bite" or other cable degradation and provides a maximum transmission distance of 8000 meters between the SIM and an underwater IM instrument. Lab diagnostics, setup, and data extraction are performed by looping an insulated wire through the inductive core on the 16plus-IM V2 and connecting the wire ends to the SIM.
Upon receipt of a wake-up command, the SIM sends a tone for 2 seconds, waking all IMs on the cable. Each 16plus-IM V2 has a programmable address (0 -99). A 16plus-IM V2 only replies to a command containing its individual ID. After replying, it returns to listening mode, waiting for commands. A global power-off command returns all IM instruments to standby (sleep) state. The 16plus-IM V2 automatically returns to sleep state if there is no line activity for 2 minutes.
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CONFIGURATION, OPTIONS, AND ACCESSORIES
A standard SBE 16plus-IM V2 is supplied with plastic housing for depths to 600 meters, 64 Mbyte FLASH RAM memory, alkaline batteries, glass-reinforced epoxy bulkhead connectors, and expendable anti-foulant devices.
Options and accessories include:
Titanium housing for depths to 7000 meters
Semi-conductor strain gauge pressure sensor or Digiquartz® pressure sensor
Wet-pluggable MCBH series connectors
SBE 5M pump (conductivity only); SBE 5P / 5T pump for pumped conductivity and pumped auxiliary sensor(s)
Auxiliary sensors for oxygen (SBE 43 DO Sensor), fluorescence, turbidity, etc. (consult factory)
Battery pack kit for lithium batteries (lithium batteries not supplied by Sea-Bird)
SOFTWARE
The SBE 16plus-IM is supplied with a powerful Windows 2000/XP software package, SEASOFT©-Win32, which includes programs for communication and data retrieval, and data processing (filtering, aligning, averaging) and plotting of CTD and auxiliary sensor data and derived variables.
SPECIFICATIONS
Dimensions in millimeters (inches)
| Measurement Range | Initial Accuracy | Typical Stability | Resolution | |
| Conductivity (S/m) | 0 - 9 | 0.0005 |
0.0003 S/m/month |
0.00005 typical |
| Temperature (°C) | -5 to +35 | 0.005 |
0.0002 °C/month |
0.0001 |
| Pressure (optional) -- Strain-Gauge | 0 to 20 / 100 / 350 / 600 / 1000 / 2000/ 3500 / 7000 meters | 0.1% of full scale range | 0.01% of full scale range/year | 0.002% of full scale range |
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Pressure (optional) -- Quartz |
0 to 20 / 60 / 130 / 200 / 270 / 680 / 1400 / 2000 / 4200 / 7000 / 10500 meters | 0.02% of full scale range | 0.025% of full scale range/year | Depends on sample integration time; consult factory |
Memory: 64 Mbyte non-volatile FLASH memory
Data Storage:| Recorded Parameter | Bytes/Sample |
| T + C | 6 |
| Pressure -- strain-gauge or Quartz | 5 |
| each external voltage | 2 |
| auxiliary RS-232 sensor | sensor dependent |
| date and time | 4 |
Real-Time Clock: 32,768 Hz TCXO accurate to ±1 minute/year
Internal Batteries: 9 alkaline D-cells
Battery Endurance 1:
CT only: 290,000 samples
CTD only: 200,000 samples
CTD & 5M pump: 110,000 samples
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With Duracell MN 1300 cells. Dependent on sampling scheme.
Auxiliary Voltage Sensors:
Auxiliary power out: up to 500 mA at 10.5 - 11 VDC
A/D resolution: 14 bits
Input range: 0 - 5 VDC
Depth Rating, Housing, and Weight:
| Depth Rating | Housing Material | Weight in air | Weight in water |
| 600 m (1950 ft) | acetal copolymer plastic | 9 kg (20 lbs) | 4 kg (9 lbs) |
| 7000 m (22,900 ft) | 3AL-2.5V titanium | 17 kg (38 lbs) | 12 kg (27 lbs) |
ADDITIONAL INFORMATION / LINKS:
Documentation -- manual, photos, technical papers, application notes, etc.
Sales Information -- options, accessories, cables, mount kits, spares, etc.
Links to Other Instruments of Interest
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Sea-Bird Home Phone: (+1) 425-643-9866 Fax: (+1) 425-643-9954 E-mail: seabird@seabird.com
