Hach NT3100sc Manual Del Usuario página 22

Figure 10 Prepare the probe
Section 7 Troubleshooting
Message
System error
Measurement failed
NO3 is too high
NO3 is too low
NO2 is too high
NO2 is too low
NOx is too high
NOx is too low
Unstable
measurement
(sc200/sc1000:
UNSTABLE)
Matrix calibration
22 English
Table 5 Error messages
Possible cause
There is a problem with the
electronic components.
The sample signal is too low.
The temperature is not stable or is
out of range.
The hardware or electronics are
defective.
The nitrate (NO ) concentration is
3
more than the maximum limit.
The nitrate (NO ) concentration is
3
less than the minimum limit.
The nitrite (NO ) concentration is
2
more than the maximum limit.
The nitrite (NO ) concentration is
2
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.
A matrix calibration is necessary.
Solution
Contact technical support.
Contact technical support.
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).
Complete a matrix calibration. First delete all
existing calibration points when the probe is
moved to a different environment or the matrix
changes significantly.