SGB VLXE Ex M Series, Documentation

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VACUUM LEAK DETECTOR VLXE .. Ex M and VLXE .. Ex MMV
28/07/2020
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6. Commissioning
(1) Only perform commissioning once the steps in Section 5 “As-
sembly” have been completed.
(2) If a leak detector is operated on a interstitial space that is already
in operation, special protective measures must be taken (for ex-
ample, testing for gas freedom in the leak detector and/or the in-
terstitial space). Additional measures may be necessary depend-
ing on the local conditions and must be assessed by qualified
personnel.
(3) If an external vacuum pump is used to evacuate, this shall be
carried out with explosion protection (Warning: be aware of
temperature code and EX group!).
6.1 Tightness test
Prior to commissioning, ensure the leak-tightness of the interstitial
space.
The vacuum build-up (generally approx. 500 mbar) should be execut-
ed using an external vacuum pump.
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" indicator lights 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 VLXE .. Ex MMV is used as per Section 3.5.1 f) and
3.5.2, 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 measuring gauge to connection on the three-way valve 21
in order to turn the valve 180°,
CAUTION: Explosive vapor-air mixtures can exist in the interior
(of the test cock/connection line). Sufficient safety measures
should be met (e.g. insert a diaphragm seal or a relevant, ap-
proved pressure measuring instrument).
(5) The vacuum build-up can be monitored via the connected meas-
uring gauge.
Commissioning
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