Hach Chlorine Sensor User Manual page 21

key and select Sensor Diag, Warning List. A list of possible warnings is
shown below.
Table 3 Warning list for the sensor
Warning Description
CL CAL A chlorine and/or pH calibration is
RECD recommended.
The chlorine and/or pH measurement
has changed enough to cause a Cal
Watch warning alarm to occur. Refer
to the sensor manuals for more
information.
CL CAL A chlorine calibration is recommended.
RECD
Chlorine calibration data is not
available (sensor with default
calibration data).
CL CAL TO The Sensor Days value for the
DO chlorine sensor is greater than the Cal
Reminder value.
CL MAINT Chlorine sensor maintenance is
RECD recommended.
The slope is 30 to 45% of default or
the slope is 250 to 300% of default.
The default slope is 100 mV/ppm
(100%).
CL MAINT Chlorine sensor maintenance is
RECD recommended.
The offset is -50 mV to 45 mV or the
offset is 45 mV to 50 mV.
Event log
The controller provides one event log for each sensor. The event log
stores a variety of events that occur on the devices such as calibrations
done, calibration options changed, etc. A list of possible events is shown
below. The event log can be read out in a CSV format. For instructions
on downloading the logs, refer to the controller user manual.
Resolution Event
Calibrate the chlorine Power On
sensor and/or pH
Flash Failure
sensor.
1pointChemZeroCL2_Start Start of one-point chemical zero calibration for
1pointChemZeroCL2_End
Calibrate the chlorine
sensor. 1pointElecZeroCL2_Start
1pointElecZeroCL2_End
Calibrate the chlorine
sensor.
1pointProcessConc_Start
1pointProcessConc _End
Do sensor
maintenance and then
2pointChemCL2_Start
repeat the calibration,
or replace the sensor.
2pointChemCL2_End
2pointElecCL2_Start
2pointElecCL2_End
Do sensor
maintenance and then CL2CalSetDefault
repeat the calibration,
AllCalSetDefault
or replace the sensor.
CL2CalOptionChanged
SensorConfChanged
ResetCL2CalHist
ResetAllSensorsCalHist
Table 4 Event log
Description
The power was turned on.
The external flash has failed or is corrupted.
chlorine
End of one-point chemical zero calibration for
chlorine
Start of one-point electrical zero calibration for
chlorine
End of one-point electrical zero calibration for
chlorine
Start of one-point process concentration for chlorine
End of one-point process concentration for chlorine
Start of two-point chemical calibration for chlorine
End of two-point chemical calibration for chlorine
Start of two-point electrical calibration for chlorine
End of two-point electrical calibration for chlorine
The chlorine calibration was reset to the default.
All sensor calibration data was reset to the default.
The chlorine calibration option was changed.
The sensor configuration was changed.
The CL2 calibration history was reset.
All sensor calibration history was reset.
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