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

37-SM MicroCAT includes:

• Serial interface (RS-232 standard, RS-485 optional)
• Memory (current firmware version [ > 3.0] has 8 MB memory instead of 2 MB)

Photos of standard shipment.

See SBE 16plus V2 SeaCAT for instrument with auxiliary sensor input capability.

Cable fits loosely through wire guide, & is clamped only at mounting clamp. See document 67094.

Thread for clamping to mooring cable:

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

Standard Connector (Impulse XSG)

Wet-pluggable Connector (MCBH)

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 our standard (Impulse XSG/RMG) connectors. Like standard connectors, wet-pluggables need proper lubrication & require care during use to avoid trapping water in sockets.

• 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 37SM-7 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-SM.

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).