Hach NT3100sc Manuel D'utilisation page 22

Message
NO3 is too high
NO3 is too low
NOx is too high
NOx is too low
Unstable measurement
(sc200/sc1000:
UNSTABLE)
Wiper failed
Flash lamp failed
Humidity
Temperature is out of
range
Message
Humidity
Temperature is out of
range
Wiper replacement
Shaft seals
Seals
22 English
Table 4 Error messages (continued)
Possible cause
The nitrate (NO ) concentration is
3
more than the maximum limit.
The nitrate (NO ) concentration is
3
less than the minimum limit.
The nitrate (NOx) concentration is
more than the maximum limit.
The nitrate (NOx) concentration is
less than the minimum limit.
The particles in the medium cause the
measurement to change continuously.
The wiper is blocked.
The wiper position is not detected.
The wiper is defective.
The flash lamp or flash lamp control is
defective.
There is too much humidity in the
sensor.
The temperature in the sensor is too
high.
Table 5 Warning and reminders
Possible cause
The humidity in the sensor is high.
The temperature in the sensor is too
high.
The time interval for servicing the wiper
blade has expired.
The time interval for servicing the shaft
seals has expired.
The time interval for servicing the seals
has expired.
Solution
Measure the concentration of a grab sample.
Check the measurement path and clean if
necessary.
Calibrate the sensor.
Check the sensor location and if necessary,
measure with filtration (bypass, flow through
cell).
Examine the measuring path and clean if
necessary.
Do a wiper test.
Contact technical support.
Contact technical support.
Remove the probe from the basin or flow-
through unit. Examine the humidity value in
Diagnostics/Test > Signals.
Contact technical support.
Check the temperature in Diagnostics/Test >
Signals.
Check the environmental conditions.
Cool the sensor.
Try a different installation location.
Contact technical support.
Solution
Remove the probe from the basin or flow-
through unit. Examine the humidity value in
Diagnostics/Test > Signals.
Check the temperature in Diagnostics/Test >
Signals.
Check the environmental conditions.
Cool the sensor.
Try a different installation location.
Contact technical support.
Replace the wiper blade.
Contact technical support.
Contact technical support.