20/05/2020
VACUUM LEAK DETECTOR
VLR ..
and
VLR .. MV
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6. Commissioning
(1) Only perform commissioning once the steps in Section 5 “Mount-
ing” have been completed.
(2) If a leak detector is operated on an interstitial space that is al-
ready in operation, special protective measures must be taken
(for example, checking that there is no liquid in the interstitial
space). Additional measures may be necessary depending on
the local conditions and must be assessed by qualified person-
nel.
6.1 Tightness
Test
Prior to commissioning, ensure the leak-tightness of the interstitial
space.
The vacuum build-up (depending on the pressure level of the leak de-
tector) should be executed using an external vacuum pump.
The starting vacuum for the tightness test should not be below the
operating pressure of the leak detector (value for Pump OFF).
The test is generally considered passed if the vacuum does not drop
by more than 1 mbar within a test period (in minutes) calculated from
the interstitial space volume divided by 10.
E.g.: The test period for an interstitial space volume of 800 liters is:
800/10 = 80 minutes. Within this test period, the vacuum must not fall
below 1 mbar.
6.2 Commissioning the Leak Detector
(1) Tightness of the interstitial space prior to commissioning is as-
sumed.
(2) Connect voltage supply.
(3) Ascertain lighting of “Operation” and “Alarm” signal lamps and
sounding of the audible alarm. If necessary, turn off audible
alarm signal.
The vacuum pump starts immediately and builds up the vacuum
in the monitored system (if the interstitial space has not already
been evacuated).
Note: If the VLR .. MV is used, it must be ensured that the probe
contacts (9/10) are bridged and a solenoid valve (24 V DC) is
connected to terminals 7 and 8.
(4) Attach the measuring gauge to the connection on three-way
valve 21 in order to turn the valve 180°.
(5) The vacuum build-up can be monitored via the connected meas-
uring gauge.
(6) If the vacuum build-up is too slow, an assembly pump can be at-
tached to the connection on three-way valve 20.
Commissioning
21
20
21
20