Specifications

3
SBE 37 (all models)
The SBE 37 is able to directly output data that is already converted to engineering units (pressure in decibars), using
calibration coefficients that are programmed into the instrument. The SBE 37 does not use a .con file.
Follow this procedure to correct the pressure:
1. With the SBE 37 in the air, place it in the orientation it will have when deployed.
2. In SEATERM, set the pressure offset to 0.0 and pressure sensor output to decibars. *
3. Acquire data. *
4. Calculate offset = (0  instrument reading).
5. Enter the calculated offset in the SBE 37 in SEATERM. *
Offset Correction Example:
Pressure displayed at elevation is -1.655 db. Offset = 0  (-1.655) = + 1.655 db
Enter offset in the SBE 37.
* NOTE: Commands for setting pressure offset, setting output format, and acquiring data vary:
Instrument
Pressure Offset
Command
Output Format
Command
Command to
Acquire Data
SBE 37-IM and 37-IMP, and
RS-485 version of
SBE 37-SM, 37-SMP, 37-SI, and 37-SIP
#iiPOFFSET=
#iiFORMAT=1 or
#iiFORMAT=2
#iiTP (measures and
outputs pressure 30 times)
RS-232 version of
SBE 37-SM, 37-SMP, 37-SI, and 37-SIP
POFFSET=
FORMAT=1 or
FORMAT=2
TP (measures and outputs
pressure 100 times)
SBE 50
The SBE 50 is able to directly output data that is already converted to engineering units (psia, decibars, or depth in feet
or meters), using calibration coefficients that are programmed into the instrument. The SBE 50 does not use a .con file.
Follow this procedure to correct the pressure:
1. With the SBE 50 in the air, place it in the orientation it will have when deployed.
2. In SEATERM, set the pressure offset to 0.0 (POFFSET=0) and set the output format to the desired format
(OUTPUTFORMAT=).
3. Acquire data using the TS command a number of times.
4. Calculate offset = (0  instrument reading).
5. Enter the calculated offset in the SBE 50 (use POFFSET= in SEATERM). The offset must be entered in units
consistent with OUTPUTFORMAT=. For example, if the output format is decibars (OUTPUTFORMAT=2),
enter the offset in decibars.
Offset Correction Example:
Pressure displayed at elevation with OUTPUTFORMAT=2 (db) is -1.655 db. Offset = 0  (-1.655) = + 1.655 db
Enter offset in the SBE 50.
