Hach NX7500 Manual Del Usuario página 12

Attach compressed air (not for flow cell operation)
Make sure that the air pressure is not more than 7 bar or damage to the valve can occur.
The probe has measuring windows with nano-coating and a compressed air cleaning system. Both
components are important to prevent particles in the optical path or fouling of the measuring
windows.
1. Use a 13 mm (0.5 in.) wrench to install the compressed air connector on the probe. Refer to
Figure 8.
2. Attach the compressed air tube to the compressed air connector. Refer to
3. For the compressed air line, install the High Output Airblast System (HOAB), the optional High
Pressure Air Cleaning System or a magnetic valve/external compressed air supply. Set the air
pressure between 3 and 6 bar. Make sure that the total length of the compressed air line is less
than 25 m (82 ft).
Note: Do not make a measurement during the cleaning interval. When compressed air supply is controlled by
the controller, measurement and cleaning are synchronized. Refer to
on page 13.
Note: Add a check valve in the compressed air line to prevent clogging in the compressed air connector.
Figure 8 Compressed air connection
1 Compressed air connector
2 Compressed air line
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N O T I C E
Set the automatic cleaning options
3 Optical windows
4 Optical path
Figure 8.