VACUUM LEAK DETECTOR
VLXE ..
31/10/2019
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6. Commissioning
(1) Do not perform the start-up until the points from section 5 "Instal-
lation" have been fulfilled.
(2) If a leak detector is put into operation on a tank or a pipe which is
already in operation, then special protection measures need to
be taken (e.g. checking that the leak detector and/or interstitial
space is free of gas). Further measures may be required depend-
ing upon the local conditions and should be assessed by quali-
fied personnel.
(3) Used to evacuate an external vacuum pump, must be designed
for
explosion protection
(Important: Note temperature class and
explosion protection group!).
6.1 Tightness test
The leak tightness of the interstitial space must be established before
commissioning.
The underpressure should be created with an external vacuum pump.
The test is to be considered as having been passed, if the vacuum
does not fall by more than one mbar during a testing period (in
minutes) of the monitoring period volume, divided by 10.
Example: 800 liters interstitial space volume
resulting in: 800/10 = 80
resulting in: 80 minutes of testing for max. 1 mbar vacuum loss.
6.2 Commissioning of the leak detector
(1) The leak tightness of the interstitial space is a prerequisite for
start-up.
(2) Switch on power.
(3) Check that the signal lamps for "Operation" and "Alarm" light and
that the audible alarm signal sounds. Switch off audible alarm if
necessary.
The vacuum pump starts immediately and builds up the under-
pressure in the monitored system, insofar as the interstitial space
has not previously been evacuated.
(4) Connect test measuring instrument to the spout of the three-way
valve 21 and rotate the tap by 180°.
IMPORTANT NOTE: There may be explosive steam-air mixtures
inside the (test tap/connection lines). Suitable protective
measures should be taken (e.g. use diaphragm seal or an au-
thorized pressure measuring instrument).
(5) The underpressure build-up can be monitored via the connected
measuring instrument.
(6) If the underpressure builds up too slowly, an installation pump
can be connected to the spout of the three-way valve 20.
Rotate tap by 180° and switch on the installation pump.
Commissioning
21
20
21
20