
20/05/2020
VACUUM LEAK DETECTOR
VLR ..
and
VLR .. MV
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7.3.2 Testing the switching values with the interstitial space
(1) Attach the measuring gauge to the connection on three-way
valve 21 and turn the valve 180°.
(2) Open the test valve at the end opposite the leak detector; if there
are multiple pipe interstitial spaces, the leak detector-side shut-
off cocks of the interstitial spaces not included in the test can be
closed.
(3) Check switching values “Pump ON” and “Alarm ON” (with visual
and audible alarm, if available). Record the values.
(4) Activate the “Sound off” key, if necessary.
(5) Return three-way valve 20 to its original position or close the test
valve and check the switching values “Alarm OFF” and “Pump
OFF”. Record the values.
(6) The unit passes the test if the measured switching values fall
within the specified tolerance.
(7) Open any shut-off cocks that were closed prior to the test.
(8) Return the three-way valves to the operating position and remove
the measuring gauge.
7.3.3 Testing the switching values with the testing device (see Section “Accessories”)
(1) Connect the testing device to the two tube ends on each of the
free connections of three-way valves 20 and 21.
(2) Connect the measuring gauge to the T-piece of the testing de-
vice.
(3) Close the needle valve of the testing device.
(4) Turn three-way valve 20 90° (counterclockwise) and three-way
valve 21 90° (clockwise) so that the interstitial space is discon-
nected.
The interstitial space volume is now simulated by the test tank.
(5) The operational vacuum is now established in the test tank.
(6) Ventilate slowly using the needle valve; check switching values
“Pump ON” and “Alarm ON” (visual and audible, if necessary).
Record the values.
(7) Press the “Audible alarm” button if necessary.
(8) Slowly close the needle valve and check switching values “Alarm
OFF” and “Pump OFF”.
(9) The unit passes the test if the measured switching values fall
within the specified tolerance.
(10) Turn back three-way valves 20 and 21 and remove the testing
device.
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Functional Check and Maintenance