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MODEL FCL-1056 SECTION 9.0
TROUBLESHOOTING
Warning message Explanation Section
Sensor No Solution Gnd pH sensor may be miswired. 9.4.1
Sensor Need Factory Cal The sensor board was not calibrated at the factory. 9.4.2
Sensor Out of Range The pH measurement is invalid. 9.4.3
Sensor Negative Reading The chlorine reading is less than -0.5 ppm. 9.4.4
Sensor RTD Sense Open RTD sensor line is broken or not connected 9.4.5
Sensor Temperature High Temperature is greater than 155ºC (311ºF) 9.4.6
Sensor Temperature Low Temperature is less than -20ºC (-4ºF) 9.4.6
Broken Glass Disabled Advisory only (applies to pH sensor only) 9.4.7
9.4.1 Sensor No Solution Gnd
This message implies that the pH sensor is miswired. Check sensor wiring.
9.4.2 Sensor Need Factory Cal
The sensor board was improperly calibrated at the factory. Call the factory for assistance.
9.4.3 Sensor Out of Range
This warning message applies to the pH sensor only. It appears when the raw signal from the pH sensor is greatly
outside the range expected for a properly operating sensor.
1. Confirm that the pH sensor is plugged into the VP cable labeled pH sensor.
2. Check wiring in the analyzer.
3. Replace the pH sensor.
9.4.4 Sensor Negative Reading
The message applies to the chlorine sensor only. The analyzer converts the raw sensor current to ppm chlorine
by subtracting the zero current from the raw current and multiplying the result by a conversion factor. If the zero
current is larger than the raw current, the result will be negative.
1. Check the zero current. It should be less than about 10 nA. If it is greater than 10 nA, repeat the zero step.
2. If the zero current is in the correct range, the negative reading might be the result of the raw current or the
sensitivity being too low. A properly operating sensor should generate between 250 and 350 nA for every
1 ppm free chlorine at pH 8. Recalibrate the sensor. If necessary, clean or replace the membrane and check
the fill solution.
3. Replace the sensor.
9.4.5 Sensor RTD Sense Open
The analyzer measures temperature using a three-wire RTD. See Figure 9.4. The in and return leads are used to
measure the resistance of the RTD. The third lead, called the sense line, is connected to the return lead at the
sensor. The sense line allows the analyzer to correct for the resistance of the in and return leads and to compen-
sate for changes in lead resistance caused by changes in ambient temperature.
1. Check sensor wiring, particularly the red, white, and white/red RTD leads.
2. Disconnect the sense and return leads and measure the resistance between them. It should be less than 1Ω.
3. Even though the sense line is open, the sensor is still usable. Use a wire jumper to connect the sense and
return terminals on the sensor terminal strip. The temperature reading will no longer be corrected for the lead
resistance, nor will the analyzer be able to compensate for changes in ambient temperature. The error could
be several ºC.
4. Replace the sensor.
9.4 TROUBLESHOOTING WHEN A WARNING MESSAGE IS SHOWING