Honeywell RM640, Handbook

Page: 122 / 184

7
SERVICE
122
RM640
www.honeywellprocess.com 34-VF-25-131 iss.1 GLO Feb 2019 US
7.1.3 How to clean the top surface of the device
Obey these instructions:
• Keep the thread of the terminal compartment cover clean.
• If dirt collects on the device, clean it. Wipe the plastic sun cover with a damp cloth.
7.1.4 How to clean horn antennas under process conditions
If it is possible that there will be build-up or condensation, purging options are available for
Metallic Horn antennas. Purge the antenna at intervals to make sure that the inner surface of
the antenna stays clean and the device measures accurately. For more data about dimensions,
refer to
Dimensions and weights
on page 141 (Purging option).
For more data, refer to the table that follows:
CAUTION!
Use multi-purpose grease that is applicable for the operating temperature range of the O-ring
with the properties that follow:
•
Operating temperature range of -40...+130 ° C / -40...+266 ° F without a negative effect on the
lubrication of the O-ring
•
Without silicone
•
The bonding properties must be satisfactory
•
Lithium-saponified
•
Water-resistant
• Agrees with the O-ring material
WARNING!
Do not let more than 5 mm / 0.2
¨
of dust collect on the top surface of the device. This is a
possible source of ignition in a potentially explosive atmosphere.
DANGER!
Risk of electrostatic discharge from the gray plastic sun cover.
WARNING!
Purge the antenna with a dry gas 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.