2
INSTALLATION
12
OPTIWAVE X400
www.krohne.com
06/2021 - 4006413503 - AD NEPSI OPTIWAVE x400 R03 en
2.2.3 Optional purging system
This option is applicable to:
•
devices that have horn antennas, and
•
explosive gas and explosive dust atmospheres
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 an explosive gas atmosphere
•
The purging fluid temperature must be less than the ignition temperature of the explosive
gas or explosive vapour atmosphere
Devices installed in an explosive dust atmosphere
•
Dust clouds:
Dust clouds:
Dust clouds:
Dust clouds: The purging fluid temperature must be less than 2/3 of the ignition temperature
•
Dust layers (thickness <5 mm / 0.2
Dust layers (thickness <5 mm / 0.2
Dust layers (thickness <5 mm / 0.2
Dust layers (thickness <5 mm / 0.2
¨
):
):
):
): The difference between the purging fluid temperature
and the ignition temperature must be more than +75
°
C
Figure 2-3: Purging system
1
NPTF purging connection
INFORMATION!
If delivered with the device, the purging connection is plugged with a 1/4 NPTF or 1/8 NPTF
screw and engaged on a minimum of 3
½
threads.
CAUTION!
If the 1/4 NPTF or 1/8 NPTF screw is removed from the purging connection, make sure that the
installation agrees with the Ex requirements for the purging system.
WARNING!
If the two conditions are applicable, then use the worst condition.
For data about dust layers thicker than 5 mm / 0.2
¨
, refer to General notes on page 10
. The
installation must agree with Chinese Law and NEPSI regulations.
