Pulse Instruments EP2100, Instruction Manual, Page: 125 / 134

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Incorrect cable length or wire gauge setting Set to the correct values
Faulty electrode Replace electrode
8.1.2 Electrodeless Conductivity Sensors
The calibration will fail if the adjustment to the gain is outside of 0.2 to 10, or the offset is outside of -10,000 to
10,000.
Possible Cause Corrective Action
Dirty sensor Clean sensor
Improper wiring of sensor to controller Correct wiring
Sensor placed too close to container walls Relocate sensor
Sensor placed in the direct path of electrical current flow Relocate sensor
Incorrect temperature reading or setting Ensure that the temperature is accurate
Incorrect cable length or wire gauge setting Set to the correct values
Faulty sensor Replace sensor
8.1.3 pH Sensors
The calibration will fail if the adjustment to the gain is outside of 0.2 to 1.2, or if the calculated offset is outside of
-140 to 140.
Possible Cause Corrective Action
Dirty electrode Clean electrode
Improper wiring of sensor to controller Correct wiring
Incorrect temperature reading or setting Ensure that the temperature is accurate
Incorrect cable length or wire gauge setting Set to the correct values
Faulty electrode Replace electrode
Faulty preamplifier Replace preamplifier
8.1.4 ORP Sensors
The calibration will fail if the adjustment to the gain is outside of 0.5 to 1.5, or if the calculated offset is outside of
-300 to 300.
Possible Cause Corrective Action
Dirty electrode Clean electrode
Improper wiring of sensor to controller Correct wiring
Faulty electrode Replace electrode
Faulty preamplifier Replace preamplifier
8.1.5 Disinfection Sensors
The calibration will fail if the adjustment to the gain is outside of 0.2 to 10.0, or if the calculated offset is outside
of -40 to 40.
Possible Cause Corrective Action
Insufficient conditioning Wait for the appropriate amount of time before attempting a calibration.
Insufficient sample flow Increase flow rate to between 30 and 100 liter per hour.
Air bubbles on membrane Dislodge bubbles. Adjust flow rate higher if necessary.
Air bubbles in electrolyte Refill membrane cap with electrolyte.
Dirty membrane Clean membrane
Loose membrane cap Tighten membrane cap.