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SBE 37-SI MicroCAT C-T (Pressure optional) Sensor
Configuration Details

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Brochure/specifications     Manual (RS-232 or RS-485)   Reference Sheet (RS-232 or RS-485)

Note: We do not publish prices on the website. Please contact us [seabird@seabird.com or (+1) 425-643-9866] for pricing.

Part # Description Notes
37SI MicroCAT C & T (pressure optional) Sensor with Serial Interface - Includes 7000 m titanium housing, 8 MB Flash memory, RS-232C interface, data/power interface cable 801385 (cable may be deleted for credit), AF24173 Anti-Foulant Devices, SEASOFT software, & complete documentation. Quantity orders will be packed several instruments to a box & each box will contain one manual & one software CD-ROM. Single packing, with a manual & CD-ROM in each box, will be provided on request. There are numerous SBE 37 MicroCAT models (SM, SMP, SMP-IDO, SI, SIP, SIP-IDO, IM, IMP, & IMP-IDO -- click here for comparison of features).

37-SI MicroCAT includes:

  • Serial Interface (RS-232 standard, RS-485 optional)
  • Memory -- (current firmware version [ > 3.0] has 8 MB FLASH memory)
    Note: firmware version < 3.0 did not have memory

Note that 37-SI does not include internal batteries. See 37-SM for comparable instrument with internal batteries.

For photos of standard shipment, click here.
SBE 37-SI Pressure Sensor Range (Depth) Options
37SI-1a 20 m strain gauge pressure sensor Pressure sensor is installed in end cap, & is not field replaceable / swappable. While highest pressure rating gives you most flexibility in using 37-SI, 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)
37SI-1b 100 m strain gauge pressure sensor
37SI-1c 350 m strain gauge pressure sensor
37SI-1h 600 m strain gauge pressure sensor
37SI-1d 1000 m strain gauge pressure sensor
37SI-1e 2000 m strain gauge pressure sensor
37SI-1f 3500 m strain gauge pressure sensor
37SI-1g 7000 m strain gauge pressure sensor
SBE 37-SI ShallowCAT Option -- Plastic (PET-P) Housing with 250 meter depth rating
37SI-2 250 m plastic housing instead of standard titanium housing (CREDIT) Substituting plastic housing for standard 7000 m titanium housing provides lower cost option for shallow deployments.
SBE 37-SI Alternate Serial Interface Option
37SI-3 RS-485 (half duplex ONLY) serial interface (replaces RS-232 interface) Two-wire, RS-485 interface provides communication with individual 37-SI or with all 37-SIs attached to RS-485 interface. This allows for coordination of sampling among many instruments. However, note that half-duplex communication is one-direction at a time (i.e., you cannot send commands & receive data at same time).
Note that RS-232 & RS-485 versions of 37-SI have separate manuals; see manual links at top of page.
SBE 37-SI Mounting Bracket Options (Specify clamp size to match O.D. of wire jacket)
37SI-4a Plastic brackets to provide through-bolt mounting to a flat surface See document 67096B.
37SI-4b Wire guide & mounting clamp for 1/4 in. diameter mooring wire Cable fits loosely through wire guide, & is clamped only at mounting. See document 67094F.

Thread for clamping to mooring cable:

  • 37SI-1b (1/4 in. diameter): 1/4-28 UNF
  • 37SI-1c (5/16 in. diameter): 5/16-24 UNF
  • 37SI-1d (3/8 in. diameter): 3/8-24 UNF
  • 37SI-1e (1/2 in. diameter): 9/16-12 UNC
  • 37SI-1f (6 mm diameter): 1/4-20 UNF
  • 37SI-1g (8 mm diameter): 5/16-24 UNF
  • 37SI-1h (10 mm diameter): 7/16 -14 UNF
  • 37SI-1i (12 mm diameter): 1/2-13 UNF
  • 37SI-1j (16 mm, 5/8 in. diameter): 5/8-18 UNF
37SI-4c Wire guide & mounting clamp for 5/16 in. diameter mooring wire
37SI-4d Wire guide & mounting clamp for 3/8 in. diameter mooring wire
37SI-4e Wire guide & mounting clamp for 1/2 in. diameter mooring wire
37SI-4f Wire guide & mounting clamp for 6 mm diameter mooring wire
37SI-4g Wire guide & mounting clamp for 8 mm diameter mooring wire
37SI-4h Wire guide & mounting clamp for 10 mm diameter mooring wire
37SI-4i Wire guide & mounting clamp for 12 mm diameter mooring wire
37SI-4j Wire guide & mounting clamp for 16 mm (5/8 in.) diameter mooring wire
SBE 37-SI Wet-Pluggable Connector Option
37SI-5 Wet-pluggable (MCBH) I/O connector instead of Standard (XSG) connector (includes data/power cable)

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.

37SI-5 includes data/power cable compatible with wet-pluggable data/power connector.
SBE 37-SI Storm Shipping Case Option -- holds up to 4 SBE 37-SIs
37SI-6 Storm shipping case (iM2950) instead of standard wood crate -- holds up to 4 SBE 37-SIs Storm shipping case with custom foam inserts holds up to 4 MicroCATs of any type (except IDO MicroCATs) -- IMP, IM, SMP, SM, SIP, SI.
  • 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 37SI-6 reflects a credit for deletion of our standard wood crate.
SBE 37-SI Spares & Accessories
801542 AF24173 Anti-Foulant Device (pair, bagged, labeled for shipping) Anti-foulant devices fit into anti-foulant device cups at each end of conductivity cell. Anti-foulant devices included with standard shipment; these are spares.
Useful life varies, depending on several factors. We recommend that customers consider more frequent replacement when high biological activity & strong current flow (greater dilution of anti-foulant concentration) are present. Moored instruments in high growth & strong dilution environments have been known to obtain a few months of quality data, while drifters that operate in non-photic, less turbid deep ocean environments may achieve years of quality data. Experience may be strongest determining factor in specific deployment environments.
233540 Anti-foulant cap without hose barb, black This cap, without a hose barb, is a spare, and is intended for use during deployment.
Note: Do not deploy MicroCAT with barbed anti-foulant device cap(s)!
50087.1 Cell filler/storage device with hose barbs (Application Note 34) This kit includes a syringe & tubing assembly, & 2 anti-foulant device caps with hose barbs. Remove installed anti-foulant device cap(s) & replace them with caps with hose barbs for cleaning & storage only.
  • 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).
Do not deploy MicroCAT with barbed anti-foulant device cap(s)!
233186 High-head pressure port plug for muddy/biologically productive environments This pressure port plug extends beyond surface of instrument end cap, and has 4 horizontal vent holes connecting internally to a vertical vent hole. Horizontal orientation of external holes prevents deposit of sediment inside pressure port. Each of the 4 vent holes is larger than single vent hole in standard pressure port plug, significantly reducing possibility that biological growth will cover all holes. See Application Note 84: Using Instruments with Druck Pressure Sensors in Muddy or Biologically Productive Environments.
801376 Data/Power interface cable, RMG-4FS to DB-9S & 9V battery snap, 2.4 m (DN 32604) 801376 -- Some users prefer battery snap connector instead of red/black twisted wire leads. Order 801376 in place of 801385 if desired.

801263 -- Some users prefer battery snap connector instead of red/black twisted wire leads. If 37SI-5 (wet-pluggable connector) specified, order 801263 in place of 801206 if desired.

801385 -- Included with standard shipment; this is spare.

801206 -- Included with standard shipment if 37SI-5 (wet-pluggable connector) specified; this is spare.

801378 -- Longer (20 m), shielded cable.
801263 Data/Power interface cable, Wet-Pluggable, MCIL-4FS to DB-9S & 9V battery snap, 2.4 m (DN 32490)
801385 Data/Power interface cable, RMG-4FS to DB-9S & red/black twisted wire leads, 2.4 m (DN 32277)
801206 Data/Power interface cable, Wet-Pluggable, MCIL-4FS to DB-9S & red/black twisted wire leads, 2.4 m (DN 32366)
801378 Data / Power interface cable, shielded, RMG-4FS to DB-9S & red/black twisted wire leads, 20 m (DN 32720)
20200 USB to Serial Port Adapter, FTDI UC232R-10 (connects computers with USB ports to RS-232 instruments) Many newer PCs & laptop computers have USB port(s) instead of RS-232 serial port(s). USB serial adapter plugs into USB port, & allows a serial device to be connected through adapter. Multi-port adapters are available from other companies; see Application Note 68.
31632 Storm shipping case (iM2950) -- holds up to 4 SBE 37-SIs Storm shipping case with custom foam inserts holds up to 4 MicroCATs of any type (except IDO MicroCATs) -- IMP, IM, SMP, SM, SIP, SI.
  • 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).

 

Product configuration options listing for all products

Additional cables, mount kits, and spares may be found at: Cables, Mount kits for Sea-Bird sensors, Mount kits for Third Party sensors, Spare parts

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Last modified: 04 Mar 2011

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