Hach-Lange CLT10 sc - Manual (Page 18)

Table 2 Error list for the sensor (continued)
Error Description Resolution
TEMP TOO LOW The temperature is less than 0 °C. Calibrate the temperature or replace the pH
sensor.
TEMP TOO HIGH The temperature is more than 100 °C.
TEMP FAIL The offset is higher than 5.0 °C or lower
than -5.0 °C. Calibrate the temperature or replace the pH
sensor.
NO FLOW The flow level is too low. Increase the flow.
Warning list
A warning does not affect the operation of menus, relays and outputs. A warning icon flashes and a
message is shown on the bottom of the measurement screen. To show the sensor warnings, push
the MENU key and select Sensor Diag, Warning List. A list of possible warnings is shown below.
Table 3 Warning list for the sensor
Warning Description Resolution
CL CAL RECD A chlorine and/or pH calibration is 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. Calibrate the chlorine sensor
and/or pH sensor.
CL CAL RECD A chlorine calibration is recommended.
Chlorine calibration data is not available (sensor with
default calibration data). Calibrate the chlorine sensor.
PH CAL RECD A pH calibration is recommended.
pH calibration data is not available (sensor with default
calibration data). Calibrate the pH sensor.
TEMP CAL RECD A temperature calibration is recommended.
Temperature calibration data is not available (sensor
with default calibration data). Calibrate the temperature.
CL CAL TO DO The Sensor Days value for the chlorine sensor is
greater than the Cal Reminder value. Calibrate the chlorine sensor.
PH CAL TO DO The Sensor Days value for the pH sensor is greater
than the Cal Reminder value. Calibrate the pH sensor.
TEMP CAL TO DO The Sensor Days value for the temperature sensor is
greater than the Cal Reminder value.
Calibrate the temperature.
CL MAINT RECD Chlorine sensor maintenance is 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%). Do sensor maintenance and then
repeat the calibration, or replace
the sensor.
CL MAINT RECD Chlorine sensor maintenance is recommended.
The offset is -50 mV to 45 mV or the offset is 45 mV to
50 mV. Do sensor maintenance and then
repeat the calibration, or replace
the sensor.
PH MAINT RECD pH sensor maintenance is recommended.
The slope is outside of the -50 to -61 mV/pH range. Clean the pH sensor, then repeat
the calibration with a fresh buffer
or sample, or replace the sensor.
PH MAINT RECD pH sensor maintenance is recommended.
The offset is outside of ±45 mV but within ±60 mV. Clean the sensor and then repeat
the calibration, or replace the
sensor.
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