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1.
Put the system in its deployment position, either vertical or horizontal.
2.
Use the software to set the pressure offset to 0.0.
3.
Collect data and show the pressure sensor output in decibars.
4.
Compare the pressure sensor output to a good quality barometer at the same
elevation.
5.
Calculate the offset. Offset = barometer value - 9plus output.
6.
Enter this value in the .xmlcon or .con file.
Example offset correction:
Absolute pressure as measured by a barometer = 1010.5 mbar. 1010.5 × 0.01=
10.1050 dbars.
Pressure value from the sensor = -2.5 dbars.
Seasave software output value (gauge pressure) = 14.7 psi.
The software converts psia to decibars: Decibars = (psia - 14.7) × 0.
Convert the 9plus from gauge to absolute: add 14.7 psia:
-2.5 dbars + (14.7 psi × 0.689476dbar/psia) = -2.5 + 10.13 - 7.635 dbars.
Offset = 10.1050 - 7.635 = 2.47 dbars. Enter this value in the .xmlcon or .con file.
Use a dead-weight pressure generator to calculate slop and offset values
1.
Remove the nylon fitting from the 9plus. There is silicon oil in the fitting and some
may spill.
2.
Use a fitting with an O-ring face seal such as Swagelok 200-1-OR as a connector.
The bore in the end flange is 5/16-24 straight thread.
3.
Use the software to set the pressure slope to 1.0 and the pressure offset to 0.0 in
the .xmlcom or .con files.
4.
Use different pressures with the dead-weight pressure generator and collect data with
the 9plus. Show the output in decibars.
5.
Do a linear regression on the data to calculate slope and offset.
6.
Enter the calculated values in the .xmlcon or .con configuration file.
7.
Fill the pressure port fitting with silicon oil from the manufacturer-supplied kit.
7.9.3 Temperature
The main cause of calibration drift in temperature sensors is the age of the thermistor
element. This drift is usually a few thousandths of a degree during the first year, and less
after that. Environmental conditions have little effect on temperature sensors.
7.10 Spare parts and accessories
23302C
SBE 25 stainless steel protective cage, no mounts
50586
SBE 25 stainless steel protective cage, 23301C, with standard sensor mounts for 3F, 4C, 5, ECO,
Seapoint, for vertical deployment
50586.H
SBE 25 stainless steel protective cage, 23301C, with standard sensor mounts for 3F, 4C, 5, ECO,
Seapoint, for horizontal deployment. Mounted in SBE 32 CTD extension stand
50671
Mount kit, 25plus housing to 25-type cage, 23303
801206
Data I/O cable, 2.4 m, DN 32366
801421
Data I/O cable, 20 m shielded, DN 32789
20200.0
USB-to-serial port adapter, FTDI UC232R-10
50508
SBE 25plus support kit—has spare communications cables, C, T sensor cable, pump-data Y-cable,
connectors, dummy plugs, maintenance supplies and other mechanical spares
171883
Y-cable, pump-data I/O, DN 32896
Maintenance
39
Содержание SBE 25plus
Страница 2: ......
Страница 6: ...SBE 25plus quick start guide 4 ...
Страница 12: ...Figure 4 SBE 32 Figure 5 SBE 36 Overview 10 ...
Страница 14: ...Figure 8 SBE 55 Overview 12 ...
Страница 22: ...Set up sensor and verify operation 20 ...
Страница 60: ...Serial sensor integration 58 ...
Страница 64: ...General information 62 ...
Страница 65: ......