Section 7 Troubleshooting; Error Messages; Warnings - Hach NITRATAX plus sc User Manual

Section 7

7.1 Error messages

Error Displayed
NONE
MOIST
R < M
DEXT < 0.0
W. POS. UNKNOWN
W. BLOCKED
FLASH FAILURE
R TOO HIGH
Wiper sealing
Sensor is missing

7.2 Warnings

Warning displayed
NONE
EM TOO HIGH
CONC. TOO HIGH
CHECK CALIBR.
REPLACE PROFILE
SERVICE REQUIRED
REPLACE SEALS
SHAFTSEALS REPL.
Inspection necessary
Troubleshooting
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
From the Main Menu, select SENSOR STATUS and confirm to determine the cause of
the fault.
Table 1 Error messages
Solution
Check MOIST value on the SENSOR-SETUP menu
>TEST/MAINT>MAINT. PROC.> SIGNALS>MOIST
Remove sensor from the tank and call service
Call service
Complete a Zero point calibration
Check measuring path, complete a wiper test
Check measuring path, complete a wiper test
Call service
Call service
Call service, the wiper is deactivated
Prove connection
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
From the Main Menu, select SENSOR STATUS and confirm to determine the cause of
the fault.
Table 2 Warnings
Cause
Correct measuring operation
Turbidity, organic content or nitrate
concentration too high, measuring range
exceeded as a result
Nitrate concentration too high, as a result
measuring range exceeded
Test interval elapsed
Counter elapsed
Counter elapsed
Counter elapsed
Counter elapsed
Counter elapsed
Table 1.
—
Table 2.
Solution
Check measurement in the laboratory
Check measurement in the laboratory
Check calibration
Change wiper profile
Call service
Call service
Call service
Call service
—
29