Hach-Lange CLT10 sc - Manual (Page 17)

Table 1 Event log (continued)
Event Description
ResetCL2CalHist The CL2 calibration history was reset.
ResetpH CalHist The pH calibration history was reset.
ResetTemp CalHist The temperature calibration history was reset.
ResetAllSensorsCalHist All sensor calibration history was reset.
ResetCL2Sensor The CL2 calibration data (sensor days, calibration history and calibration data)
was reset to the default.
ResetpHSensor The pH calibration data (sensor days, calibration history and calibration data)
was reset to the default.
ResetTempSensor The temperature calibration data (sensor days, calibration history and
calibration data) was reset to the default.
ResetAllSensors All sensor calibration data (sensor days, calibration history and calibration data)
was reset to the default.
Flow Detection The state of the proximity sensor has changed (sufficient or not sufficient flow).
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.
Table 2 Error list for the sensor
Error Description Resolution
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. Calibrate the chlorine sensor and/or pH
sensor.
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%).
Do sensor maintenance and then repeat the
calibration, or replace the sensor. Refer to the
chlorine sensor manual for more information.
CL MAINT REQD Chlorine sensor maintenance is required.
The offset is too high (more than ±50 mV).
Do sensor maintenance and then repeat the
calibration, or replace the sensor. Refer to the
chlorine sensor manual for more information.
PH TOO LOW The pH value is less than 0 pH. Calibrate or replace the pH sensor.
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. Clean the pH sensor, then repeat the
calibration with a fresh buffer or sample, or
replace the sensor.
PH OFFSET FAIL The offset is outside of ±60 mV. Clean the pH sensor and then repeat the
calibration with a fresh buffer or sample, or
replace the sensor.
PH OFFSET FAIL The offset is outside of ±60 mV. 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