Hach-Lange NITRATAX sc - Manual (Page 31)

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Section 7 Troubleshooting
7.1 Error messages
When the sensor is experiencing an error condition, the sensor reading on the
measurement screen will flash and the relays an analog outputs associated with this
sensor will be held. Errors are defined in
Table 1 .
From the Main Menu, select SENSOR STATUS and confirm to determine the cause of
the fault.
7.2 Warnings
A sensor warning will leave all menus, relays and outputs functioning normally, but will
cause a warning icon to flash.
Warnings may be used to trigger a relay and users can set warning levels to define the
severity. Warnings are defined in
Table 2 .
From the Main Menu, select SENSOR STATUS and confirm to determine the cause of
the fault.
Table 1 Error messages
Error Displayed Solution
NONE —
MOIST
Check MOIST value on the SENSOR-SETUP menu
>TEST/MAINT>MAINT. PROC.> SIGNALS>MOIST
Remove sensor from the tank and call service
R < M Call service
DEXT < 0.0 Complete a Zero point calibration
W. POS. UNKNOWN Check measuring path, complete a wiper test
W. BLOCKED Check measuring path, complete a wiper test
FLASH FAILURE Call service
R TOO HIGH Call service
Wiper sealing Call service, the wiper is deactivated
Sensor is missing Prove connection
Table 2 Warnings
Warning displayed Cause Solution
NONE Correct measuring operation —
EM TOO HIGH
Turbidity, organic content or nitrate
concentration too high, measuring range
exceeded as a result
Check measurement in the laboratory
CONC. TOO HIGH
Nitrate concentration too high, as a result
measuring range exceeded
Check measurement in the laboratory
CHECK CALIBR. Test interval elapsed Check calibration
REPLACE PROFILE Counter elapsed Change wiper profile
SERVICE REQUIRED Counter elapsed Call service
REPLACE SEALS Counter elapsed Call service
SHAFTSEALS REPL. Counter elapsed Call service
Inspection necessary Counter elapsed Call service