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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Note: We do not publish prices on the website.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 Sea-Bird (seabird@seabird.com or 425-643-9866) for pricing.

Part # Description Notes
37SI MicroCAT C & T (pressure optional) Sensor with Serial Interface - Includes 7000 m titanium housing, RS-232C interface, data/power interface cable 801385 , AF24173 Anti-Foulant Devices, SEASOFT software, & complete documentation (data/power cable may be deleted for credit). 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 6 MicroCAT models. 37-SI MicroCAT includes:
  • Serial Interface (RS-232 standard, RS-485 optional)

Note that 37-SI does not include memory or internal batteries. See 37-SM for comparable instrument with memory & 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 Substitute 250 meter plastic housing (credit) Substituting plastic housing for standard 7000 meter 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 mount clamp wire size to match O.D. of wire jacket)
37SI-4a Plastic brackets to provide through-bolt mounting to a flat surface See document 67096 for mechanical details.
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 67094 for mechanical details.

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.) mooring wire
SBE 37-SI Wet-Pluggable Connector Option
37SI-5 Substitute Wet-pluggable (MCBH) I/O connector for Standard (XSG) connector (includes data I/O cable)


Standard Connector (Impulse XSG)

 Wet-pluggable connector (MCBH) -- photo not available
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 I/O cable compatible with wet-pluggable data I/O connector.
SBE 37-SI Accessories & Spares
801542 AF24173 Anti-Foulant Device (pair, bagged, labeled for shipping) (replaces PN 801347) 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.
50087.1 Cell filling, cleaning, & storage device kit with (2) anti-foulant device caps with hose barbs for 37-SI, 37-SM, or 37-IM MicroCATs 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)!
801376 Data/Power interface cable, RMG-4FS to DB-9S & 9V battery snap connector, 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.
801263 Data/Power interface cable, MCIL-4FS to DB-9S & 9V battery snap connector, 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, MCIL-4FS to DB-9S & red/black twisted wire leads, 2.4 m (DN 32366)
20163 USB to 232 Serial (DB-9P) Adapter, IOGear GUC232A (connects portable computers with USB adapters 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.

 

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Last modified: 10 Apr 2007

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