OVERPRESSURE LEAK DETECTOR
DLR-2
18/01/2002 Ihr Partner für Leckanzeigetechnik
Sicherungsgerätebau GmbH, Siegen
- 3 -
4. Functional description
The overpressure leak detector DLR-2 monitors both walls of pipework for leaks. The monitor-
ing pressure is so high that leaks in the inner or outer wall are indicated by a fall in pressure.
An inert gas (usually nitrogen from gas bottles
) is used as the leak detection medium.
4.1. Switching values of the leak detector
Device type
Max. nom. pressure
p
Alarm
p
Soll
DLR-2/11
up to 11 bar
pre-adjusted by the manu-
facturer:
4.0
+0.4
/
-0.0
8.0
+0.0
/
-0.4
DLR-2/22
up to 22 bar
pre-adjusted by the manu-
facturer:
11.0
+0.4
/
-0.0
16.0
+0.0
/
-0.4
4.2. Normal
operation
The status of normal operation is achieved during the putting into operation process by building
up pressure on top of the nominal pressure, usually by means of a mobile pressure tank.
The pressure in the interstitial space is monitored by a pressure switch in the leak detector. Any
leaks lead to a fall in pressure. This means that extremely high demands are made on the air-
tightness of the interstitial space(s) and the connection pipe(s) in order to guarantee one year of
trouble-free operation.
4.3. Air or liquid leak
If there is a leak in the inner or outer pipe, inert gas escapes from the interstitial space. The
pressure falls.
If the pressure falls below the alarm pressure the optical and acoustic alarms are triggered.
4.4. Overpressure
valve
An overpressure valve has not been provided for in the leak detector, but it can be used if the
particular application makes it necessary. (Please contact the manufacturer).
4
or from a nitrogen supply network within the company (with suitable pressure reducer in place).
