Hach-Lange 1200-S sc - Manual (Page 25)

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Section 7 Faults, causes, rectification
7.1 Error messages
Possible sensor errors are displayed by the controller.
7.2 Warnings
Possible warning messages are displayed by the controller.
Table 1: Error messages
Error displayed Cause Rectification
*****
No communication with the
controller
Check the connection to the controller
Check the cable to the controller
Check the 12 V power supply
SENSOR MISSING
FFFFFFFFFFFFF No communication with the
controller
Check the connection to the controller
Check the cable to the controller
Check the 12 V power supply
TEMP TOO LOW Measured temperature < –5 °C
Ensure that the medium temperature is > –5 °C.
Check whether the internal resistance of the Pt 100 is
approx. 99 Ohm.
TEMP TOO HIGH Measured temperature > +100 °C
Ensure that the medium temperature is < +100 °C.
Check whether the internal resistance of the Pt 100 is
approx. 138.5 Ohm.
pH TOO LOW pH is lower than –2 pH
Check the sensor for leaks.
Change the electrode.
Change the board.
pH TOO HIGH pH is higher than +14 pH
Check the sensor for leaks.
Change the electrode.
Change the board.
mV TOO LOW mV is lower than –1500 mV
Check the sensor for leaks.
Change the electrode.
Change the board.
mV TOO HIGH mV is higher than +1500 mV
Check the sensor for leaks.
Change the electrode.
Change the board.
Table 2: Warnings
Error displayed Cause Rectification
CAL TOO OLD
The last calibration was more than x days ago.
(Setting from the sensor setup) Calibrate the sensor.
Set the calibration interval in the sensor setup.
HUMIDITY BAG The desiccant bag is more than 1000 days old. Please contact service.
REF IMP. LOW Impedance of Reference electrode too low Please contact service.
REF IMP. HGH Impedance of Reference electrode too high Please contact service.
GLASS IMP. LOW Impedance of Glass electrode too low Please contact service.
GLASS IMP. HGH Impedance of Glass electrode too high Please contact service.