PRESSURE LEAK DETECTOR
DLR-GS ..
06/08/2020
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The pressure leak detector DLR-GS monitors both walls of the dou-
ble-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.
Inert gas, air from a pressure gas bottle or from a pressure gas sys-
tem can be used as leak detection media. If air is used, it must be
dried to a relative humidity of less than 10%.
The current pressure is shown on the display in mbar/bar or PSI
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:
Values of less than 150 mbar or less than 2.18 PSI will not be dis-
played.
Values of up to 990 mbar will be displayed in mbar and without
decimal.
Values from 1 bar are displayed in bar with two decimals and from
10 bar with one decimal.
Values in PSI are displayed with one or two decimals.
4.2 Normal Operating Condition
The normal operating condition is achieved during the initial operation
through pressure buildup to the operating pressure, generally with a
mobile pressure tank.
The existing pressure in the interstitial space is monitored with a pres-
sure sensor in the leak detector. Any minor leaks will lead to a fall in
pressure. The result of this is that the requirements for the impermea-
bility of the interstitial space(s) and the connection(s) must be set very
high to assure trouble free operation for one year.
4.3 Function in Case of Leaks
If there is a leak in the inner or outer wall, gas will leak from the inter-
stitial space. The pressure drops.
An optical and audible alarm will be triggered when the alarm pres-
sure is reached, which will open the voltage-free contacts.
Optionally, an additional relay can be used to establish voltage-free
contacts when the specified “Refilling required” pressure is not
reached. The pressure value for “Refilling required” is approx. 1 bar
above the "Alarm ON” switching value.
4.4 Overpressure
Valve
An overpressure valve is not provided in the leak detector, but it can
be installed if the application requires it. (Please consult with the man-
ufacturer).
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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