Problem
Solution
The sensor readings
show "Range" when
the measurement is
not within the
measurment range
or the value is not
calculated correctly.
1.
Examine the optical path for a blockage. Clean the measuring windows. Refer to
on page 15.
2.
Make sure that all of the measured parameters are within the measurement range.
Refer to
on page 3.
3.
If Nitrite and Nitrate are measured, make sure that the difference between the Nitrite
and Nitrate values is not higher than a factor of ×20. If the difference between the
values is too high, the probe cannot correctly calculate the concentration for the two
parameters.
4.
Make sure that settings for factor and offset are correct. Refer to
on page 14.
5.
Identify if the expected measuring value is detectable with the installed optical path
length.
6.
Measure the optical path length of the sensor. Make sure that the correct length is set
in the controller settings. Refer to the controller documentation for more information.
7.
Identify if a long-term averaging is set in the analog output card menu.
If none of the steps gives a solution to the problem, contact the technical support.
The compressed air
cleaning does not
work.
1.
Examine the compressed air hoses and wiring for damage. Replace components if
there are damage.
2.
Make sure that the relay wiring is correct. Refer to the controller documentation.
3.
Examine the settings of the cleaning interval in the NX7500 configuration. Refer to
on page 13.
4.
Examine the controller settings for the cleaning. Refer to the controller
documentation.
5.
Identify if there is a nozzle blockage at the probe. Remove the 90° hose connector
and carefully clean the nozzle with a needle from the rear side. Make sure that the
measuring windows are not damaged. Clean the 90° connector before re-assembly.
Replacement parts and accessories
W A R N I N G
Personal injury hazard. Use of non-approved parts may cause personal injury, damage to the
instrument or equipment malfunction. The replacement parts in this section are approved by the
manufacturer.
Note: Product and Article numbers may vary for some selling regions. Contact the appropriate distributor or refer to
the company website for contact information.
Replacement parts
Description
Item no.
Hanging ring, 5 mm (0.2 in.)
LZY668
90° connection at sensor, compressed air hose
LXZ529.99.00003
O-ring and screw set, flow cell, includes hexagon key
LXZ529.99.00004
Fitting set for flow cell
LXZ529.99.00005
Compression ring, flow cell (2x)
LXZ529.99.00006
Panel with screws, flow cell
LXZ529.99.00007
English
17