Campbell CS526 Instrukcja Obsługi Pobierz pdf (Strona 14)

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.

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Campbell CS526 Instrukcja Obsługi Strona 14