15 Fault Finding
76
♦
Where extension cables have been used, try connecting the sensor directly to
the instrument.
♦
Check the sensor using a hand held meter.
The Sensor Reading Is Incorrect
♦
Check the temperature compensation mode. If the compensation is set to
“Manual” check that the fixed temperature is at the correct level. If the
compensation is “Automatic” check that the temperature reading on the main
display is correct.
♦
Use another instrument to check the sensor.
♦
Check that the sensor gives sensible readings in air (100%) and Sodium
Sulphite Solution (0%)
♦
Check the Pressure and Salinity Compensation values
♦
Check that no error messages are being displayed.
The Temperature Reading Is Incorrect
♦ Check that the temperature sensor is correctly attached.
♦ Check that the temperature sensor type is correctly selected in the
“Configuration” menu.
♦
Where practical check the temperature sensor resistance against the table in
Appendix F.
♦
Check the user calibration.
Current Output is Incorrect or Noisy
♦
Check that the maximum load for the current loop has not been exceeded.
(1000Ω)
♦
Check that the terminals have been wired correctly .
♦
Check that the cable screen is attached to Earth at one end, and that the
cable does not pass too close to a power cable. Check that the current output
has been configured properly.
♦
Check the user calibration.
Pressure Input is Incorrect or Noisy
♦
Check that the maximum load for the current loop has not been exceeded.
♦
Check that the terminals have been wired correctly and that the cable screen
is attached to Earth at one end. Make sure that the cable does not pass too
close to a power cable.
♦
Check that the Pressure Input has been configured properly. Try performing a
user calibration.
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