Campbell CS526 Manual Pagina 14

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CS526 ISFET pH Probe
TABLE 9-1. Calibration Standards
pH CSI Part Number
4 25587
7 25586
10 25588
Frequency of calibration depends on the level of accuracy required and the
coating / fouling nature of the measured samples.
10. Troubleshooting
The most common causes for erroneous pH data include:
poor sensor connections to the datalogger
damaged cables
scratched chip
Problem:
Output signal is at its maximum value.
Possible reason:
o Probe is not in fluid.
o Chip is polluted.
o Diaphragm is polluted.
o Chip is scratched.
Suggestion:
o Put probe in fluid.
o Clean probe using soapy water method.
o Probe cannot be fixed if chip is scratched.
Problem:
Probe response is very slow.
Possible reason:
o Diaphragm is chipped or polluted.
Suggestion:
o Clean probe with soapy water method.
Problem:
Probe signal is drifting.
Possible reason:
o Diaphragm can be dried out.
o Chip is scratched.
Suggestion:
o Soak probe for 10 minutes in saturated KC1 solution (CSI PN
16349).
o Probe cannot be fixed.
8
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