VACUUM LEAK DETECTOR
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7.3.4 Testing the pump delivery pressure
The test of the delivery pressure of the pump is carried out in order to
determine if the vacuum source is capable of establishing the operat-
ing vacuum in the interstitial space.
(1) Attach the measuring gauge to the connection on three-way
valve 20 and turn the valve 90° (counterclockwise).
(2) The pump is usually not running at this moment, i.e., the pres-
sure sensor must be vented to start the pump.
(3) Turn three-way valve 21 90° (clockwise). The pressure sensor is
vented, the pump starts (and the alarm is triggered, acknowledge
if necessary).
(4) This unit passes the test if the suction height of the vacuum
pump is at least 40 mbar higher than the switching value “Pump
OFF” (i.e., the operational vacuum).
(5) Once the test is complete, return the valves to their original posi-
tions and remove the measuring gauge.
7.3.5 System tightness test
(1) The system tightness requirement is defined in Section 6.1.
Determine the test period for each interstitial space connected
(and/or the entire monitored system) (calculate or use test re-
ports prepared by SGB GmbH).
(2) Attach the measuring gauge to the connection on three-way
valve 21 and turn the valve 180°.
(3) Read off and record the starting vacuum and time. Wait for the
test period to elapse and determine the vacuum drop.
(4) The test is considered passed if the vacuum does not drop by
more than 1 mbar during the test period.
Of course, a multiple of the test period can also be measured; in
this case, the permissible vacuum drop is also a multiple.
(5) Once the test is complete, return the valves to their original posi-
tions and remove the measuring gauge.
7.3.6 Checking the excess pressure alarm (only for version with solenoid valve)
(1) Attach the excess pressure testing device to the connection on
three-way valve 21 and turn the valve 180°.
(2) Then turn three-way valve 21 90°.
(3) Apply pressure using the excess pressure testing device. First
the pump is switched on, then the alarm is triggered (red LED
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