KROHNE OPTIWAVE 7300C EN - Manual (Page 83)

SERVICE
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OPTIWAVE 7300 C
www.krohne.com 03/2014 - 4000172405 - HB OPTIWAVE 7300 R07 en
7.3 How to clean horn antennas under process conditions
If it is possible that there will be build-up, a purging option is available for horn antennas.
For more data, refer to the table that follows:
How to use the purge
7.4 How to replace device components
7.4.1 Service warranty
Maintenance is not necessary for most applications.
Servicing by the customer is limited by warranty to
• The removal and installation of the signal converter housing. For more data, refer to How to
turn or remove the signal converter on page 37.
• The removal and installation of the complete electronic module.
• The removal and installation of the terminal module.
• The removal and installation of the HMI cover.
This housing can be detached from the flange system under process conditions.
Use only authorized service staff to repair the device.
WARNING!
Purge the antenna with a dry gas or liquid that is applicable to the process.
CAUTION!
Purge the antenna at intervals to make sure that the inner surface of the antenna stays clean
and the device measures accurately.
Process conditions How to use the purge
The device is colder than other
elements in the process. It is
possible that there will be
condensation in the antenna.
Continuous use. Use low-pressure gas to remove condensation from
the antenna.
There is a risk of build-up in the
antenna
Purge at intervals. Use compressed air, nitrogen or another gas that
is applicable to the process up to 6 bar / 87 psi.
There is a build-up or risk of
build-up in the antenna
Purge at intervals. Use a liquid (hot water, solvent or another liquid
that is applicable to the process) to melt the liquid that has
crystallized on the antenna.