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PH MONITOR
pH Electrode Calibration
2-9317-600-00-0 Aquastorm™ Series Options Guide 8-161
Response Time/
Stability
Response time and stability are affected by the glass surface of the pH electrode,
the reference junction, and reference solution. Rating is 95% response in ≤ three
(3) seconds for glass bulb type electrodes and 95% response ≤ five (5) seconds
for flat glass type electrodes.
Conditions that may cause mV fluctuations from the stable ±3 mV:
• Electrode coating
• Excessive flowrates grater than 1.22 M/sec (4 ft./sec.)
• Ground fault
To detect/correct ground faults:
• Remove electrode from application and test in a beaker using pH 4, 7, and 10
buffers or use a beaker of the process solution. If normal operation performed
in the beaker, but application stability is not achieved, suspect a ground fault.
• Use instrumentation with isolated inputs and outputs.
• Ground solution
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