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

37-IMP MicroCAT includes:

• Inductive modem interface
• Memory
• internal, integral Pump -- Pump provides improved conductivity response & improved anti-foul protection over 37-IM.

Photos of standard shipment.

Communicating with 1 or more 37-IMPs 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 & optional pressure recorder with inductive modem interface.
• SBE 16plus-IM V2 SeaCAT for CTD with inductive modem interface & 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.

Thread for clamping to mooring cable:

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

Pressure sensor is installed in end cap (behind mount clamp), & is not field replaceable / swappable. While highest pressure rating gives you most flexibility in using 37-IMP, 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 37IMP-4 reflects a credit for deletion of our standard wood crate.

One set of batteries is included with standard shipment; 50441 are spares. Batteries are easily accessed by removing 2 screws from modem end cap & pulling out end cap. Shipping restrictions apply for lithium batteries; see SBE 37-IMP manual for details.

801863 is battery holder, without batteries. Battery holder is included with standard shipment; this is a spare.

NOTE: Older MicroCATs use a battery pack with a red cover plate; wiring of that pack is different from this one, & cannot be used with 37-IMP MicroCATs with firmware version > 4.0.

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 & 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 use a battery pack with a yellow cover plate; wiring of that pack is different from this one, & cannot be used with 37-IMP MicroCATs with firmware version < 4.0.

• 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).