MicroCAT C and T (pressure optional) Sensor with Serial Interface - Includes 8 MB Flash memory, serial interface, data/power cable (cable may be deleted for credit), AF24173 Anti-Foulant Devices, Seasoft software, & complete documentation.
37-SI MicroCAT includes:
Note: 37-SI does not include internal batteries.
Compare features of the numerous SBE 37 MicroCAT models.
|SBE 37-SI Housing (depth) Selections — MUST SELECT ONE
||350 m plastic housing
||7000 m titanium housing
|SBE 37-SI Pressure Sensor Range (depth) Selections — MUST SELECT ONE
||No pressure sensor
||Pressure sensor is installed in end cap, & is not field replaceable / swappable. While highest pressure rating gives you most flexibility in using MicroCAT, 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)
||20 m strain gauge pressure sensor
||100 m strain gauge pressure sensor
||350 m strain gauge pressure sensor
||600 m strain gauge pressure sensor
||1000 m strain gauge pressure sensor
||2000 m strain gauge pressure sensor
||3500 m strain gauge pressure sensor
||7000 m strain gauge pressure sensor
|SBE 37-SI Connector Selections — MUST SELECT ONE
||XSG connector (includes data/power interface cable 801385)
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 XSG/AG connectors. Like XSG/AG connectors, wet-pluggables need proper lubrication & require care during use to avoid trapping water in sockets.
XSG connector on left, Wet-pluggable (MCBH) connector on right
||Wet-pluggable (MCBH) connector (includes data/power interface cable 801206)
|SBE 37-SI Communications Selections— MUST SELECT ONE
||RS-232 serial interface
||Note: Each interface version of 37-SI has a separate manual.
||RS-485 (half duplex ONLY) serial 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: Each interface version of 37-SI has a separate manual.
|SBE 37-SI Mooring Clamp Wire Size Options (Specify clamp to match O.D. of mooring wire jacket)
||Plastic brackets to provide through-bolt mounting to a flat surface
See document 67096. '.I' designation indicates that brackets are to be installed on instrument at factory.
||Wire guide & mounting clamp for 1/4 in. diameter mooring wire
Cable fits loosely through wire guide, & is clamped only at mounting clamp. See document 67094. (photo is of 37-SIP; 37-SI is similar). '.I' designation indicates that guide and clamp are to be installed on instrument at factory.
Thread for clamping to mooring cable:
- 1/4 in. diameter: 1/4-28 UNF
- 5/16 in./8 mm diameter: 5/16-24 UNF
- 3/8 in. diameter: 3/8-24 UNF
- 1/2 in. diameter: 9/16-12 UNC
- 5/8 in./16 mm diameter: 5/8-18 UNF
- 6 mm diameter: 1/4-20 UNF
- 10 mm diameter: 7/16 -14 UNF
- 12 mm diameter: 1/2-13 UNF
Clamp Size Note: Mooring wire is typically specified by wire size, not by outer diameter (O.D.) of the mooring wire jacket. Verify the wire jacket O.D. before selecting the clamp size. The clamp size must be less than or equal to the wire jacket O.D. but larger than the wire diameter. For example, Mooring System Inc.’s specifications for 3x19 wire rope (in 2016) are as follows:
||Recommended Sea-Bird Clamp
|3/16 inch (5.0 mm)
||0.255 inch (6.5 mm)
|1/4 inch (6.5 mm)
||0.330 inch (8.4 mm)
|5/16 inch (8.0 mm)
||0.392 inch (9.9 mm)
|3/8 inch (9.5 mm)
||0.453 inch (11.5 mm)
||10 mm (0.394 inch)
|7/16 inch (11.1 mm)
||0.5 inch (12.7 mm)
For mounting on a rope, verify the rope outer diameter, and select a clamp smaller than the rope O.D. to account for the rope compressibility (for example, for 5/16 inch rope, select a ¼ inch clamp; a 5/16 inch clamp will be too large).
||Wire guide & mounting clamp for 5/16 in. or 8 mm diameter mooring wire
||Wire guide & mounting clamp for 3/8 in. diameter mooring wire
||Wire guide & mounting clamp for 1/2 in. diameter mooring wire
||Wire guide & mounting clamp for 6 mm diameter mooring wire
||Wire guide & mounting clamp for 10 mm diameter mooring wire
||Wire guide & mounting clamp for 12 mm diameter mooring wire
||Wire guide & mounting clamp for 5/8 in. or 16 mm diameter mooring wire
|SBE 37-SI Spares & Accessories
||AF24173 Anti-Foulant Device pair (spare, 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.
||Anti-foulant cap without hose barb, black (for use with SBE 37 [SM, SMP, IM, IMP, SI, SIP] with firmware version < 4.0)
||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)!
||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.
Do not deploy MicroCAT with barbed anti-foulant device cap(s)!
- 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).
||Data/Power interface cable, RMG-4FS to DB-9S & 9V battery snap, 2.4 m (DN 32604)
||Some users prefer battery snap connector instead of red/black twisted wire leads. Order 801376 in place of 801385 if desired.
||Data/Power interface cable, Wet-Pluggable, MCIL-4FS to DB-9S & 9V battery snap, 2.4 m (DN 32490)
||Some users prefer battery snap connector instead of red/black twisted wire leads. Order 801263 in place of 801206 if desired.
||Data/Power interface cable, RMG-4FS to DB-9S & red/black twisted wire leads, 2.4 m(DN 32277)
||Included with standard shipment if 37SI.xx1x0 (XSG connector) selected; this is spare.
||Data/Power interface cable, Wet-Pluggable, MCIL-4FS to DB-9S & red/black twisted wire leads, 2.4 m(DN 32366)
||Included with standard shipment if 37SI.xx2x0 (MCBH connector) selected; this is spare.
||Data / Power interface cable, shielded, RMG-4FS to DB-9S & red/black twisted wire leads, 20 m(DN 32720)
||Longer, shielded cable for use if if 37SI.xx1x0 (XSG connector) selected.
||Data / Power interface cable, shielded, MCIL-4FS to DB-9S & red/black twisted wire leads, 20 m (DN 33404)
||Longer, shielded cable for use if if 37SI.xx2x0 (MCBH connector) selected.
||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.
||High-head pressure port plug for muddy/biologically productive environments (Application Note 84), for use with SBE 37 [SM, SMP, IM, IMP, SI, SIP] with firmware version < 4.0
||This pressure port plug extends beyond surface of instrument end cap, and has 4 horizontal vent holes connecting internally to a vertical vent hole. If you are deploying 37-SI in an orientation close to horizontal, with pressure port up, horizontal orientation of vent 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.
||Storm Shipping Case (iM2950) - holds up to 4 SBE 37SIs
Storm shipping case with custom foam inserts holds up to 4 MicroCATs that do not include dissolved oxygen — 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).