Page
22
ML442 | v5k
Expo Technologies UK
T: +44 (0) 20 8398 8011
Expo Technologies US
T: +1 (440) 247 5314
Expo Technologies China
T: +86 532 8906 9858
Is the tube
between the RLV
tapping and flow
sensor air tight?
Is the PE strong
enough?
Is the Purge
Flow Sensor out
of calibration or
faulty?
Purging indicator will not
turn "Yellow" during
Purging.
Call Expo
Is the supply
pipe to the air
inlet as least
12mm I.D?
Is there
excessive
leakage from
the PE?
Is the air supply
pressure
incorrect?
No
Check the air
supply pressure
at the inlet to the
MiniPurge is
stable between
4 - 8 Barg /
60 - 115 psi
Yes
Replace pipe
work
No
Yes
Any significant
leakage must be
corrected. Check
for leaks down
the cables or
conduit. Ensure
leakage does not
exceed 60
Nl/min (2 cfm)
Yes
No
No
The standard
requires that the
PE is tested to
1.5 times the
Relief Valve
opening
pressure e.g. 15
mbarg for many
systems. Has
this been done?
No
The basic operation of the Purge Flow
Sensor can be checked by unscrewing the
60mm diameter diaphragm housing and, by
using a rubber pad, e.g. an eraser, block
the 12mm threaded hole in the top of the
valve module. The valve should operate
and the indicator turn amber. If this is
correct, the sensor diaphragm needs
recalibrating or replacing.
Yes
Ensure fitting nuts
are tightened and
that the tube is
not damaged.
Check and repair
as necessary.
No
Yes
Yes
