Replacement Parts And Accessories - Hach NX7500 Manual Del Usuario

Problem
The sensor readings
show "Range" when
the measurement is
not within the
measurment range
or the value is not
calculated correctly.
The compressed air
cleaning does not
work.

Replacement parts and accessories

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
Hanging ring, 5 mm (0.2 in.)
90° connection at sensor, compressed air hose
O-ring and screw set, flow cell, includes hexagon key
Fitting set for flow cell
Compression ring, flow cell (2x)
Panel with screws, flow cell
Solution
1. Examine the optical path for a blockage. Clean the measuring windows. Refer to
Clean the measuring window
2. Make sure that all of the measured parameters are within the measurement range.
Refer to Specifications
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.
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
Configure the probe
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.
on page 15.
on page 3.
on page 13.
W A R N I N G
Calibrate the sensor
Item no.
LZY668
LXZ529.99.00003
LXZ529.99.00004
LXZ529.99.00005
LXZ529.99.00006
LXZ529.99.00007
English 17