page 68 of 91 USB-QFLCII-14804/0
Level sensor
View of the inlet isolation valve with open inspection door
f) Check to see if the material is detected by the sensor.
If the level sensor
detects deposits, it will be indicated as a malfunction message sent to the
monitoring panel
. In addition, the LED ring will light up, indicating the
level sensor is detecting deposits.
• If the LED ring does not light up, the sensor has to be readjusted (see
section 9.15, Adjusting the level sensor).
• If the LED ring lights up, the sensor is adjusted correctly.
Potentiometer
LED
ring
Level sensor
g) Remove the material you placed onto the level sensor.
h) Close the inspection lid (see Section 9.4 Inspection lid opening and
closing):
9.14 Optional feature: Adjusting the level sensor (if
installed)
Factory settings of the
level sensor
DANGER
There is a risk that material deposits in the inlet isolation device might go
undetected if the level sensor is not properly adjusted!
This could lead to malfunction of the inlet isolation device if the flap blade does not
close properly in the event of an explosion. Explosion pressure/flame passage to
upstream system areas could be the result.
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