SBE 37-IM MicroCAT C-T (Pressure optional) Recorder
Configuration Details

37-IM MicroCAT includes:

• Inductive modem interface
• Memory (current firmware version [ > 3.0] has 8 MB memory instead of 2 MB)

Photos of standard shipment.

Communicating with 1 or more 37-IMs requires use of Sea-Bird Surface Inductive Modem (SIM), which provides serial interface (RS-232 or RS-485) between user’s computer & up to 100 IM instruments coupled to single cable. Purchase SIM & optional Inductive Cable Coupler (ICC) separately.

Also see:

• SBE 39-IM for temperature and optional pressure recorder with inductive modem interface.
• SBE 16plus-IM V2 SeaCAT for CTD with inductive modem interface and auxiliary sensor input capability.
• SBE 44 Underwater Inductive Modem or Underwater Inductive Modem Module (UIMM) to integrate an RS-232 sensor with Sea-Bird's inductive modem telemetry system.

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

Thread for clamping to mooring cable:

• 37IM-1a (1/4 in. diameter): 1/4-28 UNF
• 37IM-1b (5/16 in. diameter): 5/16-24 UNF
• 37IM-1c (3/8 in. diameter): 3/8-24 UNF
• 37IM-1d (1/2 in. diameter): 9/16-12 UNC
• 37IM-1e (6 mm diameter): 1/4-20 UNF
• 37IM-1f (8 mm diameter): 5/16-24 UNF
• 37IM-1g (10 mm diameter): 7/16 -14 UNF
• 37IM-1h (12 mm diameter): 1/2-13 UNF
• 37IM-1i (16 mm, 5/8 in. diameter): 5/8-18 UNF

Pressure sensor is installed in end cap, & is not field replaceable / swappable. While highest pressure rating gives you most flexibility in using 37-IM, 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 --

• 2000 m sensor:
  initial accuracy = 2 m (= 0.1% * 2000 m),
  resolution = 0.04 m (= 0.002% * 2000 m)
• 7000 m sensor:
  initial accuracy = 7 m (= 0.1% * 7000 m),
  resolution = 0.14 m (= 0.002% * 7000 m)

• Injection molded case with HPX resin plastic body, recessed wheels, automatic pressure equalization valve, hinged push-button latches, fold-down padded handle, & O-ring seal. Meets airline luggage regulations.
• Inner dimensions:
  29 x 18 x 10.5 inches (74 x 46 x 27 cm).
• Outer dimensions:
  31.3 x 20.4 x 12.2 inches (80 x 52 x 31 cm).

Price for 37IM-4 reflects a credit for deletion of our standard wood crate.

In July 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 37-IM.

801797 shown with 50441 batteries installed

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

• Cleaning instructions require use of syringe & tubing assembly at intake end of conductivity cell (requiring 1 barbed cap).
• Storage instructions require looping Tygon tubing from end to end of conductivity cell (requiring 2 barbed caps).

• Injection molded case with HPX resin plastic body, recessed wheels, automatic pressure equalization valve, hinged push-button latches, fold-down padded handle, & O-ring seal. Meets airline luggage regulations.
• Inner dimensions:
  29 x 18 x 10.5 inches (74 x 46 x 27 cm).
• Outer dimensions:
  31.3 x 20.4 x 12.2 inches (80 x 52 x 31 cm).