PRESSURE LEAK DETECTOR DLR-P ..
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The pressure leak detector DLR-P monitors both walls of the double-
walled system for leaks. The monitoring pressure during operation is
higher than any pressure on the inner or outer wall, so that leaks will
be indicated by a pressure drop.
Air is used as leak detection medium. It is dried to a relative humidity
of less than 10 % by the dry filter in the vacuum line.
Used dry filter
fillings must be regenerated or exchanged.
The current pressure is shown on the display in mbar/bar or PSI
4
:
o
Values of less than 150 mbar or less than 2.18 PSI will not be dis-
played.
o
Values of up to 990 mbar will be displayed in mbar and without
decimal.
o
Values from 1 bar are displayed in bar with two decimals and from
10 bar with one decimal.
o
Values in PSI are displayed with one or two decimals.
4.2
Normal Operating Condition
The pressure leak detector is connected with the interstitial space(s)
through the connection line(s). The excess pressure generated by the
pump is measured and controlled by a pressure sensor.
When the operating pressure is reached (Pump OFF), the pump
shuts off. The pressure drops off slowly due to unavoidable leaks in
the leak detector system. When the ”Pump ON” switching value is
reached, the pump will be turned on and the operating pressure will
be built up again.
Depending on the grade of tightness of the entire unit, the overpres-
sure moves between the switching value Refilling OFF and the
switching value Refilling ON.
4.3
Function in Case of Leaks
If there is a leak in the inner or outer wall, air will leak from the inter-
stitial space. The pressure will fall until the overpressure pump is
turned on to reestablish the operating pressure. If the volume flow
that is flowing out due to the leak is larger than the (limited) feed ca-
pacity of the pump, the pressure in the system will fall and the pump
will work in constant mode.
An enlargement of the leak will lead to further falling of pressure until
the alarm pressure is reached. This triggers the visual, audible and
potential-free alarms.
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The change of the bar and PSI settings is performed at the factory. This change can also be performed on site following
coordination with the manufacturer.
Design and Function