Hach CLF10sc User Manual page 18

Event
TempCalOptionChanged
SensorConfChanged
ResetCL2CalHist
ResetpH CalHist
ResetTemp CalHist
ResetAllSensorsCalHist
ResetCL2Sensor
ResetpHSensor
ResetTempSensor
ResetAllSensors
Flow Detection
7.2 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 Chlorine sensor maintenance is
REQD required.
The slope is less than 30% or more
than 300% of the default.
The default slope is 100 mV/ppm
(100%).
CL MAINT Chlorine sensor maintenance is
REQD 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.
18 English
Table 1 Event log (continued)
Description
The temperature calibration option was changed.
The sensor configuration was changed.
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.