PRESSURE LEAK DETECTOR DLR-P ..
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7.3.3 Testing the switching values
(1) Attach measuring gauge to connection on three-way valve 21
and turn valve 180°.
(2) For pipelines in accordance with 5.8.1 and 5.8.2:
Close the shut-off valves on the manifold except for the interstitial
space on which the test is being performed.
Open the test valve (end pointing away from the leak detector) on
this interstitial space.
For pipelines in accordance with 5.8.3 and 5.8.4:
Turn three-way valve 20 90° (UZS), the system is ventilated.
(3)
Check switching values ”Pump ON” and ”Alarm ON” (with visual
and audible, if available). Record the values.
(4)
Press the “mute” button if necessary.
(5) Return three-way valve 20 to its original position or close test
valve and test 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 valves that were closed prior to the test.
(8) Return three-way valve to the operating position and remove the
measuring gauge.
7.3.4 Testing the overpressure valve and pump delivery head
(1) Attach measuring gauge to connection on three-way valve 20
and turn valve 90° (GUZS).
(2)
The pump is usually not running at this moment, i.e. the pressure sen-
sor must be vented to start the pump
.
(3) Turn three-way valve 21 90° (UZS). The pressure sensor is vent-
ed, the pump starts (and the alarm is triggered, acknowledge if
necessary).
(4) This test is considered passed if the pressure does not increase
beyond the value listed in the table in section 3.3, column
P
ÜDV1
.
(5) Turn three-way valve 21 90° (GUZS). The pump stops and the
pressure drops to the closing pressure of the overpressure valve.
The measured closing pressure should not be below the meas-
ured value for Pump Off.
(6) Once the test is complete, return valves to their original positions
and remove the measuring gauge.
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Functional Check and Maintenance