Error List - Hach CLF10sc User Manual

Event
ResetCL2CalHist
ResetpH CalHist
ResetTemp CalHist
ResetAllSensorsCalHist
ResetCL2Sensor
ResetpHSensor
ResetTempSensor
ResetAllSensors
Flow Detection

Error list

Errors may occur for various reasons. The sensor reading on the measurement screen flashes. All
outputs are held when specified in the controller menu. To show the sensor errors, push the MENU
key and select Sensor Diag, Error List. A list of possible errors is shown below.
Error Description
CL CAL REQD A chlorine calibration and/or pH calibration
is required.
The chlorine and/or pH measurement has
changed enough to cause a Cal Watch
alarm to occur. Refer to the chlorine sensor
manual for more information.
CL MAINT REQD Chlorine sensor maintenance is required.
The slope is less than 30% or more than
300% of the default.
The default slope is 100 mV/ppm (100%).
CL MAINT REQD Chlorine sensor maintenance is required.
The offset is too high (more than ±50 mV).
PH TOO LOW The pH value is less than 0 pH.
PH TOO HIGH The pH value is more than 14 pH.
PH SLOPE FAIL The slope is outside of the -45 to -65 mV/pH
range.
PH OFFSET FAIL The offset is outside of ±60 mV.
PH OFFSET FAIL The offset is outside of ±60 mV.
Table 1 Event log (continued)
Description
The CL2 calibration history was reset.
The pH calibration history was reset.
The temperature calibration history was reset.
All sensor calibration history was reset.
The CL2 calibration data (sensor days, calibration history and calibration data)
was reset to the default.
The pH calibration data (sensor days, calibration history and calibration data)
was reset to the default.
The temperature calibration data (sensor days, calibration history and
calibration data) was reset to the default.
All sensor calibration data (sensor days, calibration history and calibration data)
was reset to the default.
The state of the proximity sensor has changed (sufficient or not sufficient flow).
Table 2 Error list for the sensor
Resolution
Calibrate the chlorine sensor and/or pH
sensor.
Do sensor maintenance and then repeat the
calibration, or replace the sensor. Refer to the
chlorine sensor manual for more information.
Do sensor maintenance and then repeat the
calibration, or replace the sensor. Refer to the
chlorine sensor manual for more information.
Calibrate or replace the pH sensor.
Clean the pH sensor, then repeat the
calibration with a fresh buffer or sample, or
replace the sensor.
Clean the pH sensor and then repeat the
calibration with a fresh buffer or sample, or
replace the sensor.
Clean the pH sensor and replace the salt
bridge and standard cell solution. Repeat the
calibration with a fresh buffer or sample, or
replace the sensor.
English 17