PRESSURE LEAK DETECTOR
DLR-G ..
24/10/2018
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(3) Check the test valve at the end of the interstitial space pointing
away from the leak detector for tightness and contamination, and
clean it, if necessary
(4) Checking the free passage of air in the interstitial space (section
7.3.2)
(5) Testing the switching values (section 7.3.3)
(6) Tightness test following commissioning or correction of malfunc-
tions (section 7.3.4)
(7) Tightness test as part of the annual functional check (section
7.3.5)
(8) Creating the operating condition (section 7.3.6)
(9) A qualified person must complete a test report, confirming func-
tional and operational safety.
7.3.2 Checking the free passage of air in the interstitial space
Checking the free passage of air ensures that an interstitial space is
connected to the leak detector and that the interstitial space has suffi-
cient passage to cause an air leak to trigger an alarm.
If several interstitial spaces are connected in parallel, each one of
them must be checked for passage.
(1) Insert measuring gauge into the test coupling. The current pres-
sure in the interstitial space will be displayed.
(2) Open the test valve for the first connected interstitial space.
(3) Check whether the measuring gauge registers a pressure drop.
(4) Close the test valve.
(5) Repeat process from paragraph (2) to (4) for each additional test
valve of the interstitial space(s) connected to this leak detector.
With operating mode "C", if automatic refilling is activated during
this process, perform the filling process and then continue the
test.
(6) With operating mode "I", the pressure drop due to the test must
be compensated as follows:
a) Connect pressure cylinder according to section 5.3 (5.4 and
6.1)
b) Activate "Filling".
c) Pressure build-up to operating pressure. Check the pressure
on the pressure reducer during the filling process (test pres-
sure may not be exceeded) and adjust, if necessary.
d) Once the filling process has been completed, close the shut-
off valve on the pressure reducer and disconnect the meas-
uring gauge and the pressure cylinder.
Functional Check and Maintenance
