20/05/2020
VACUUM LEAK DETECTOR
VLR ..
and
VLR .. MV
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on), and if the pressure continues to increase, the excess pres-
sure alarm is triggered (yellow LED flashes).
(4) With the excess pressure alarm, the pump is switched off and the
solenoid valve closes.
(5) Relieve excess pressure by detaching the excess pressure test-
ing device. The excess pressure alarm stops and the pump runs;
the solenoid valve opens.
(6) Once the test is complete, return the valves to their original posi-
tions and remove the measuring gauge.
7.3.7 Checking the additional pressure switch in conjunction with VLR .. MV
(1) Connect the testing device as per Section 7.3.5 and complete
steps (1) to (5).
(2) Close the shut-off cock on the interstitial space side.
(3) Connect an external pressure booster to connection 82 and open
the relevant valve.
(4) Pressure build-up until activation of the pressure switch (probe
alarm is triggered and the solenoid valve switches).
(5) Check the corresponding alarm(s).
(6) Relieve pressure; probe alarm stops and the solenoid valve
switches.
(7) Close the shut-off cock at 82 and remove the pressure booster.
(8) Open the shut-off cock on the interstitial space side, move three-
way valves 20 and 21 into the operating position, and remove
testing device
7.3.8 Checking the probe (only VLR .. with additional probe)
(1) Bring the probe into the alarm state. Depending on the probe ver-
sion, either by pressing a test button (“WHG probes”), by turning
the housing (float), or by removing it and dipping it in test liquid.
Note: If the probe is checked by removing it, the stop valves must
be closed to maintain the vacuum in the interstitial space. Open
again after the test!
(2) Check the probe alarm as per Section 4.6.1 and the switching of
the solenoid valve.
(3) Establish the probe operating condition again; the probe alarm
stops and the solenoid valve opens.
7.3.9 Achieving the operating condition
(1) Test whether all pneumatic connections have been established
correctly.
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Functional Check and Maintenance