Maritime G6100 Operation Manual page 71

Water Monitoring System
The following signs indicate an electrode reaching its end of lifetime. The electrode must
be replaced whenever one of the below signs are identified:
• The pH/Temperature sensor is difficult to calibrate. Storing a calibration point
should take max 180 seconds. The electrode must be replaced if longer time is
required.
• The pH/Temperature sensor was calibrated successfully, but the output drifts within
15 minutes after the calibration. To test drift please immerge the sensor in e.g. clean
tap water – note the initial displayed pH value – leave the sensor in the water for
15 minutes - then note the displayed value after 15 minutes.
• The pH/Temperature sensor gives a fixed output of around pH 7
• The pH/Temperature sensor gives no output.
• The glass tip of the electrode is damaged.
• Water has entered the electrical connection of the electrode.
• If the pH sensor flashes every second, the calibration is not accepted.
Changing of the Electrode is easily done by following the maintenance instruction
MI6100-0007.
Note
It is recommended to keep an electrode in stock as a spare part.
Ver.5.0 – Revision March 2022
Calculate drift:
Drift = "Initial value" ÷ "15-minute value"
Max drift allowed is +/-0.2 pH units
Page 71 of 110