Underwater Inductive Modem Module (UIMM)

Underwater Inductive Modem Module (UIMM)

Quick way for system integrators and instrument/sensor manufacturers to adapt new or pre-existing RS-232 instruments, such as acoustic current meters, Doppler profilers, optical sensors, etc., for integration with real-time moorings using Sea-Bird’s Inductive Modem (IM) telemetry.

The Underwater Inductive Modem Module (UIMM) provides a quick way for system integrators and instrument/sensor manufacturers to adapt new or pre-existing RS-232 instruments, such as acoustic current meters, Doppler profilers, optical sensors, etc., for integration with real-time moorings using Sea-Bird’s Inductive Modem (IM) telemetry (see Application Note 92: Real-Time Oceanography with Inductive Moorings and the Inductive Modem Module (IMM) for detailed system description). The UIMM is simply an Inductive Modem Module (IMM) housed in a pressure case and incorporating an integral inductive coupler and cable clamp. It is designed to be cable-connected to an RS-232 serial instrument, and then clamped to the jacketed mooring wire. The UIMM can also be used as a substitute for an IMM (housed inside a buoy) and an Inductive Cable Coupler (ICC); it receives inductive communications from other underwater IM devices and sends the data via RS-232 to the surface buoy (or bottom junction in a cabled observatory).

The IMM is user-configured via RS-232 to send and receive commands to control the serial instrument and receive or retrieve data. Through its 4-pin connector, the UIMM communicates with the RS-232 instrument and consumes a small amount of power from it.

FEATURES

  • Integrates RS-232 instruments to Sea-Bird’s Inductive Modem (IM) telemetry system.
  • Requires small amount of power from serial instrument (no internal batteries).
  • 350 m plastic or 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.
  • UIMM interfaces to a serial instrument at 300, 600, 1200, 2400, 4800, 9600, or 19200 baud, while transmitting data at 1200 baud over the IM line.

Typical Ocean Mooring
(other configurations available)

MOORING SCHEMATIC

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 UIMM. The UIMM interprets the commands, relays commands to the serial instrument, and transmits replies from the instrument to the IMM/SIM. In typical surface buoys, the jacketed mooring wire is connected 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 IM-enabled instrument and below the point where the wire is grounded.

OPTIONS

  • Plastic (350 m) or titanium (7000 m) housing.
  • Wire guide and mounting clamp in one of 9 sizes.

 

 

 

 

 

 

 

Power Consumption External power required: 6 - 30 VDC
Quiescent current: 300 microWatt *
Operating current: 15 milliWatt *
* Power draw higher for input voltages>19 VDC; consult factory.
Sensor Interface RS-232.
Sensor baud rate 300, 600, 1200, 2400, 4800, 9600, or 19200 (IM telemetry rate 1200 baud).
Memory for Sensor Data 16 KByte (40 stored samples maximum)
Housing, Depth Rating, & Weight Plastic, 350 m; Weight (with mounting guide and mooring clamp) 1.1 kg in air, 0.45 kg in water
Titanium, 7000 m.

   

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

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 . Housing
UIMM . 1 – 350 m (plastic)
    2 – 7000 m (titanium)

Example: UIMM.1 is a UIMM with 350 m housing. See table below for description of each selection:

PART # DESCRIPTION NOTES
UIMM

Underwater Inductive Modem Module (UIMM) — Converts RS-232 telemetry from a variety of instruments (e.g., current meters, Doppler profilers, etc.) to inductive telemetry, for use with other Sea-Bird  inductive telemetry system instruments and components. No internal batteries. Includes 4-pin Wet-pluggable bulkhead connector (MCBH), mounting clamp for jacketed wire rope, data/power cable (801263), & complete documentation.

Communicating with 1 or more UIMMs requires use of Sea-Bird Surface Inductive Modem (SIM) or Inductive Modem Module (IMM), which provides serial interface (RS-232 or RS-485) between user’s computer & up to 100 IM instruments coupled to single cable. Alternatively, a second UIMM can substitute for IMM or SIM and Inductive Cable Coupler (ICC).

Purchase SIM / IMM & optional ICC separately.

UIMM provides a more flexible interface than SBE 44 Underwater Inductive Modem, 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.

UIMM Housing Selections MUST SELECT ONE
UIMM.1 350 m plastic housing

 

UIMM.2 7000 m titanium housing
UIMM Mooring Wire Guide Size Selections (Specify clamp to match O.D. of mooring wire jacket) — MUST SELECT ONE
UIMM-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:

  • UIMM-1a (1/4 in. diameter): 1/4-28 UNF
  • UIMM-1b (5/16 in. diameter): 5/16-24 UNF
  • UIMM-1c (3/8 in. diameter): 3/8-24 UNF
  • UIMM-1d (1/2 in. diameter): 9/16-12 UNC
  • UIMM-1e (6 mm diameter): 1/4-20 UNF
  • UIMM-1f (8 mm diameter): 5/16-24 UNF
  • UIMM-1g (10 mm diameter): 7/16 -14 UNF
  • UIMM-1h (12 mm diameter): 1/2-13 UNF
  • UIMM-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
UIMM-1b Wire guide & mounting clamp for 5/16 in. diameter mooring wire
UIMM-1c Wire guide & mounting clamp for 3/8 in. diameter mooring wire
UIMM-1d Wire guide & mounting clamp for 1/2 in. diameter mooring wire
UIMM-1e Wire guide & mounting clamp for 6 mm diameter mooring wire
UIMM-1f Wire guide & mounting clamp for 8 mm diameter mooring wire
UIMM-1g Wire guide & mounting clamp for 10 mm diameter mooring wire
UIMM-1h Wire guide & mounting clamp for 12 mm diameter mooring wire
UIMM-1i Wire guide & mounting clamp for 16 mm (5/8 in.) diameter mooring wire
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

  • 801263 To computer COM port with 9V connector, 2.4 m, DN 32490

Mount Kits

To Mooring cable (document 67142 for all sizes)

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

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.