SBE 44 Underwater Inductive Modem (UIM)

SBE 44 Underwater Inductive Modem (UIM)

Integrates RS-232 instruments to Inductive Modem (IM) telemetry system. Internal battery pack provides power to SBE 44 and can also power the RS-232 instrument.

The SBE 44 Underwater Inductive Modem makes it possible to integrate current meters, Doppler profilers, or other instruments having standard serial interfaces with MicroCATs and other instruments that communicate via Sea-Bird’s Inductive Modem (IM) telemetry. The SBE 44 is designed for long-duration deployments on moorings. It has a built-in inductive cable coupler (split toroid) and cable clamp, providing data communications without the need for electrical connections, and an easy and secure attachment to any point on a jacketed mooring wire. An underwater bulkhead connector on the end cap provides the serial data connection, a control line, and switched power out.

When the SBE 44 receives a command over the IM link containing its unique ID, it relays the command to the serial instrument and transmits the reply over the IM link. A buffer allows the SBE 44 to interface to serial instruments at 300 to 19200 baud while transmitting data at 1200 baud over the IM link. Programmable setup parameters include timeout values, control signal logic, and sensor response termination logic, allowing the SBE 44 to interface to a wide variety of instruments without requiring custom programming.

FEATURES

  • Integrates RS-232 instruments to Sea-Bird's Inductive Modem (IM) telemetry system.
  • Internal battery pack (can be powered externally) powers SBE 44, and can also power serial instrument.
  • 7000 m titanium housing.
  • Seasoft© V2 Windows software package (setup).
  • Sea-Bird's field-proven IM telemetry, with more than 3000 Sea-Bird IM instruments deployed since 1997.
  • Five-year limited warranty.

COMPONENTS

  • 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.
  • 30 Kbyte FIFO buffer allows SBE 44 to interface to a serial instrument at 300, 600, 1200, 2400, 4800, 9600, or 19200 baud while transmitting data at 1200 baud over the IM line.

MOORING SCHEMATICS

In a typical mooring, an Inductive Modem Module (IMM) or Surface Inductive Modem (SIM) housed in the buoy communicates with underwater IM instruments and is interfaced to a computer or data logger via an RS-232 serial port. The computer/data logger (not supplied by Sea-Bird) is programmed to poll each IM instrument on the mooring for its data, and send the data to a telemetry transmitter (satellite link, cell phone, RF modem, etc.). Communication between the computer/data logger and IMM/SIM is full-duplex RS-232C. Commands and data are transmitted half-duplex between the IMM/SIM and SBE 44. The SBE 44 interprets the commands, relays commands to the serial instrument, and transmits replies from the instrument to the IMM/SIM. There are two methods of connecting the IMM/SIM to the jacketed wire:


Direct Connection


Connection with ICC
In a direct connection (typical cable-to-shore applications), the bottom end of the wire is grounded to seawater, and the top end is insulated all the way to the connection to the IMM/SIM connection. A second wire from the IMM/SIM connects to seawater ground, completing the circuit. In typical surface buoys it may be preferable to connect the jacketed mooring wire to the buoy with a length of chain, grounding the wire to seawater at each end. An Inductive Cable Coupler (ICC) connects the IMM/SIM to the jacketed wire above the uppermost UIM and below the point where the wire is grounded.

OPTIONS

  • XSG or wet-pluggable MCBH connector.
  • Wire guide and mounting clamp in one of 9 sizes.
Power Supply & Consumption 10.6 Amp-hour (nominal) battery pack, derated to 8.8 Amp-hour (if not supplying power to serial instrument) or 5.7 Amp-hour (if supplying power to serial instrument).
Quiescent current: < 100 microAmps.
Operating current: 10 milliAmps.
Maximum current to serial instrument: 1.5 Amps.
Sensor Interface RS-232. Sensor baud rate 300, 600, 1200, 2400, 4800, 9600, or 19200 (IM telemetry rate 1200 baud).
Housing, Depth Rating, & Weight Titanium, 7000 m, 3.2 kg in air, 2.1 kg in water

 

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

For older SBE 44 product manuals, organized by instrument firmware version, click here.

SeatermĀ© is a terminal program for setup and data upload of a wide variety of older Sea-Bird instruments. Seaterm is part of our Seasoft V2 software suite.
Version 1.59 released October 10, 2007
Seaterm_Win32_V1_59.exe for Windows XP/Vista/7


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.

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:

  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.

Family . Connector
44 . 1 – AG
    2 – MCBH

Example: 44.1 is an SBE 44 with AG connector. See table below for description of each selection:

PART # DESCRIPTION NOTES
44

UNDERWATER INDUCTIVE MODEM - Converts RS-232 telemetry from a variety of instruments (e.g., current meter, tide gauge, ADCP, etc.) to inductive telemetry, for use with other Sea-Bird inductive telemetry system instruments and components. Includes titanium housing (7000 meter depth), 6-pin bulkhead connector, mounting clamp for jacketed wire rope, lithium battery (non-hazardous), test cable, Seasoft software, and complete documentation.

Communicating with 1 or more 44s requires use of Sea-Bird Surface Inductive Modem (SIM) or Inductive Modem Module (IMM), which provides serial interface between user’s computer & up to 100 IM instruments coupled to single cable. Purchase IMM/SIM & optional Inductive Cable Coupler (ICC) separately.

Underwater Inductive Modem Module (UIMM) provides a more flexible interface than SBE 44, and is an economical alternative to SBE 44 for RS-232 instruments that have an internal power supply or where you plan to power an RS-232 instrument with an external battery pack.

SBE 44 Connector Selections MUST SELECT ONE
44.1 AG bulkhead connector (includes AG test cable, PN 801434)

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.

XSG connector shown; photo of MCBH connector not available

44.2 Wet-pluggable (MCBH) bulkhead connector (includes Wet-pluggable test cable, PN 801450)
SBE 44 Mooring Clamp Wire Size Selections (Specify clamp to match O.D. of mooring wire jacket) — MUST SELECT ONE
44-1a Wire guide & mounting clamp for 1/4 in. diameter mooring wire

Cable fits loosely through IM coupling core / wire guide, & is clamped only at mounting clamp. See document 67142A.

Thread for clamping to mooring cable:

  • 44-1a (1/4 in. diameter): 1/4-28 UNF
  • 44-1b (5/16 in. diameter): 5/16-24 UNF
  • 44-1c (3/8 in. diameter): 3/8-24 UNF
  • 44-1d (1/2 in. diameter): 9/16-12 UNC
  • 44-1e (6 mm diameter): 1/4-20 UNF
  • 44-1f (8 mm diameter): 5/16-24 UNF
  • 44-1g (10 mm diameter): 7/16 -14 UNF
  • 44-1h (12 mm diameter): 1/2-13 UNF
  • 44-1i (16 mm, 5/8 in. diameter): 5/8-18 UNF

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
44-1b Wire guide & mounting clamp for 5/16 in. diameter mooring wire
44-1c Wire guide & mounting clamp for 3/8 in. diameter mooring wire
44-1d Wire guide & mounting clamp for 1/2 in. diameter mooring wire
44-1e Wire guide & mounting clamp for 6 mm diameter mooring wire
44-1f Wire guide & mounting clamp for 8 mm diameter mooring wire
44-1g Wire guide & mounting clamp for 10 mm diameter mooring wire
44-1h Wire guide & mounting clamp for 12 mm diameter mooring wire
44-1i Wire guide & mounting clamp for 16 mm (5/8 in.) diameter mooring wire
SBE 44 Spares & Accessories
50442 Red top battery holder (7V nominal, Version 1) (PN 801797) and twelve AA lithium cells (PN 50441), for SBE 37 (SM, SMP, IM, IMP with firmware version < 4.0) and SBE 44

One set of batteries is included with standard shipment; 50441 are spares. Batteries are easily accessed by removing 2 screws from connector end cap & pulling out end cap. Shipping restrictions apply for lithium batteries; see SBE 44 manual for details. Click here to buy Saft LS 14500 from Amazon.

In 2008, original battery pack was replaced with red top battery holder, which uses 12 AA lithium batteries instead of 50243.1 battery set. See MicroCAT Change Notice and Application Note 89 for details.

801797 is battery holder, without batteries.

Price for 50442, which includes both battery holder (801797) & batteries (50441), is less than price when ordering battery holder & batteries separately. Sea-Bird is helping to absorb some cost for new battery holders by providing a reduced price.

Note: Newer MicroCATs (SMP & IMP with firmware > 4.0, and all IDO & ODO MicroCATs) use a battery pack with a yellow cover plate; the wiring of that pack is different from this one, and cannot be used with SBE 44.


801797 shown with 50441 cells installed
(Note: Cells cannot be shipped installed in battery holder)


Cells packed in heat-sealed plastic (above),
then placed in bubble-wrap outer sleeve & strong packaging for shipment (below)

50441

SBE 37 & 44 lithium batteries (spare), package of twelve 3.6V AA cells (Saft LS 14500)

801797

Red top battery holder (7V nominal, Version 1) for use with twelve 3.6V AA lithium cells, for SBE 37 (SM, SMP, IM, IMP with firmware version < 4.0) & SBE 44

801434 2.4 m test cable, AG-206 to DB-9S (DN 32806) Connects SBE 44 to computer to test serial communication through SBE 44’s RS-232 bulkhead connector. Cable included with standard shipment if 44 with AG connector ordered; this is spare.
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.

Cables

  • 171887 To computer COM port (from Surface Inductive Modem), 3 m
  • 801583 To computer COM port (from Inductive Modem Module), 0.25 m, DN 33049
  • 801434 To computer COM port (from SBE 44 AG connector for serial instrument, for testing), 2.4 m, DN 32806
  • 801450 To computer COM port (from SBE 44 Wet-pluggable connector for serial instrument, for testing), 2.4 m, DN 32832

Mount Kits

Mounted to Mooring Cable (document 67142 for all sizes)

  • 50357  SBE 44 Cable Clamp Kit, 1/4-inch diameter
  • 50358  SBE 44 Cable Clamp Kit, 5/16-inch diameter
  • 50359  SBE 44 Cable Clamp Kit, 3/8-inch diameter
  • 50360  SBE 44 Cable Clamp Kit, 1/2-inch diameter
  • 50362  SBE 44 Cable Clamp Kit, 6-mm diameter
  • 50358  SBE 44 Cable Clamp Kit, 8-mm diameter
  • 50364  SBE 44 Cable Clamp Kit, 10-mm diameter
  • 50365  SBE 44 Cable Clamp Kit, 12-mm diameter
  • 50361  SBE 44 Cable Clamp Kit, 16-mm (5/8-inch) 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

 

Spare Parts

Batteries [see MicroCAT Change Notice and Application Note 89]

  • 50442 SBE 37 & 44 retrofit battery holder (801797) and twelve AA lithium cells (50441)
  • 801797 Retrofit battery holder for SBE 37 and SBE 44, for use with twelve 3.6V AA lithium cells
  • 50441 SBE 37 and 44 lithium batteries, package of twelve 3.6V AA cells (Saft LS 14500) - Click here to buy Saft LS 14500 from Amazon.

Hardware, O-ring, & Mounting Kits

  • 60033 Hardware & O-ring kit for SBE 37-IM, 37-IMP, or 44 (instruments delivered after 1999; compatible with obsolete 50243 batteries) (document 67052)
  • 60050 Hardware & O-ring kit for SBE 37-IM, 37-IMP, or 44 with titanium housing (instruments delivered after 1999; compatible with 50441 AA lithium batteries & 801797 retrofit battery holder) (document 67202)
  • 60054 Hardware & O-ring kit for SBE 37-IM, 37-IMP, or 44 with plastic housing (instruments delivered after 1999; compatible with 50441 AA lithium batteries & 801797 retrofit battery holder) (document 67207)
  • varies Cable clamp kit for SBE 37-IM, 37-IMP, 16plus-IM, 16plus-IM V2, 44, or UIMM (document 67142)

 

Compare Inductive Modem Instruments

SBE Measures
(C, T, P)
Auxiliary Sensors Memory Power Comments
Internal External
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
* = optional

Notes:
1. See Inductive Modem Module (IMM) or Surface Inductive Modem (SIM), and Inductive Cable Coupler (ICC) to complete your inductive modem system.
2. See Application Note 92: Real-Time Oceanography with Inductive Moorings and the Inductive Modem Module (IMM) for background information.
3. products are no longer in production. Follow the links above to the product page to retrieve manuals and application notes for these older products.