2
INSTALLATION
8
OPTIWAVE-M 7400
www.krohne.com
10/2018 - 4007039501 - AD ATEX OPTIWAVE-M 7400 R01a
Connection and operation of the purging connection are the responsibility of the user. The
operator is also responsible for selection of a suitable fluid to purge the device.
Devices installed in a gas atmosphere
•
The purging fluid temperature must be less than the ignition temperature of the gas or
vapour atmosphere
•
The purging fluid temperature must be between the minimum and maximum limits for the
gasket (for more data, refer to the handbook) and the type of antenna (for more data, refer to
Ambient and process connection temperatures
on page 8)
2.3 Operating conditions
The allowable ambient temperature and related process connection temperature range for the
device depends on the temperature classes and maximum surface temperature marked on the
nameplate.
2.3.1 Ambient and process connection temperatures
The tables that follow are applicable in these conditions:
•
Device installation must agree with the instructions given in the handbook.
INFORMATION!
If delivered with the device, the purging connection is plugged with a 1/4 NPTF screw and
engaged on a minimum of 3
½
threads.
CAUTION!
If the 1/4 NPTF screw is removed from the purging connection, make sure that the installation
agrees with the Ex requirements for the purging system.
WARNING!
The gasket temperature must be in the approved limits. For more data, refer to "Pressure and
temperature ranges" in the Installation chapter of the handbook. The type of gasket and gasket
material must agree with the process.
WARNING!
The reference point for the process temperature is the flange facing of the device. In the tables
that follow, this reference point will be referred to as the "process connection temperature".
WARNING!
An explosive atmosphere is a mixture of air and flammable gases, vapour, mist or dust in
atmospheric conditions. If you do not use the device in these conditions (T
atm
= -20...+60
°
C and
p
atm
= 0.8...1.1 barg), do an analysis of the risk of ignition.
T
atm
= atmospheric temperature and p
atm
= atmospheric pressure.
WARNING!
Make sure that the maximum process connection temperature and maximum ambient
temperature are not more than the values given in the tables.
