7 | Installation and commissioning
D-LX 201/721
67
Purge air differential pressure (hPa)
Volume flow (Nm3/h)
Fig.7.20: Purge air flow through the sighting tube depending on the differential pressure
The numerical values relate to a sighting tube of 1 ¼“ in diameter and 500 mm in
length. If using sighting tubes with the same diameter and between 300 and 800 mm
in length, the change to the volume flow would be negligible, especially with low differ-
ential pressures.
NOTICE
A reliable supply of purge air must be ensured even when the system is stopped. The
purge air serves to protect the system fitted onto the burner. The purge air shields the
components from hot and/or aggressive gases and dust. If the purge air fails, the lens
may quickly become contaminated and the device may overheat due to a build-up of
heat and be destroyed.
The operator must therefore ensure that:
● The purge air supply is operating reliably and smoothly
● A failure is detected immediately
Connect the flame monitor and the purge air. To do so, attach the hose from the sys-
tem-side purge air blower to the designated purge air connection (½" inner thread) on
the pipe connection.
Fig.7.21: Purge air connection 1/2" screw connection with inner pipe thread
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