24/10/2018
PRESSURE LEAK DETECTOR
DLR-G ..
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7.3.3 Testing the switching values
(1) If several interstitial spaces are connected via a manifold system,
close all shut-off cocks on the manifold except for the shut-off
cock for the interstitial space to be tested.
(2) Insert a manometer into the test coupling.
(3) Open the test valve at the end of the interstitial space included in
the test pointing away from the leak detector.
(4) Check the switching values for "Automatic refilling" or "Refilling
required" (the yellow signal lamp lights up) and for "Alarm ON".
Record the values.
(5) Close the test valve.
(6) Operating mode "C":
During the pressure build-up (automatic
filling), check the switching values for "Alarm OFF" and "Refilling
OFF" (activate "Filling" if necessary). Record the values.
Operating mode "I":
Connect pressure cylinder according to
section 5.3 (5.4 and 6.1). Activate "Filling". During the pressure
build-up, check the switching values for "Alarm OFF" and "Refill-
ing (here: Filling) OFF". Record the values. Remove the pressure
cylinder.
(7) The test is considered passed if the values specified in section
3.3 have been satisfied.
(8) Disconnect the measuring gauge.
(9) Open all shut-off cocks in the connection line(s).
7.3.4 Tightness test following commissioning or correction of malfunctions
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(1) Insert measuring gauge into the test coupling. The measuring
gauge will display the current pressure.
(2) The tightness test is approved for one year of trouble-free opera-
tion if the following conditions have been met:
Operating mode "C":
The test time per 100 liters of interstitial space volume is 8
minutes. A pressure drop of 1 mbar is permitted within this speci-
fied test time. If a pressure drop of 1 mbar cannot be measured,
multiplication of the pressure drop will result in the same multipli-
cation of the test time.
Example:
Interstitial space volume: 1500 liters;
Test time (with measurable pressure drop of 1 mbar):
1500 / 100 x 8 = 120 minutes
Test time (with measurable pressure drop of 10 mbar):
120 x 10 = 1200 minutes (
20 hours)
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This section assumes that the operating pressure has been built up in the interstitial space and the pressure has been
compensated.
Functional Check and Maintenance
