PRESSURE LEAK DETECTOR DLR-P ..
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4.4
Overpressure Valve
The overpressure valve installed in the pressure line protects the in-
terstitial space against impermissibly high pressures (exceeding the
test pressure). Such pressure increases can be caused by outside
factors or a hot filling. In the latter case, it is recommended that the
manufacturer be contacted.
With sufficient pressure resistance of the interstitial space, the over-
pressure valve can be omitted if so agreed between the manufacturer
of the pipe/fitting and SGB.
4.5
Dry filter
A dry filter is needed to dry the incoming ambient air to the point
where condensation does not occur in the interstitial space.
For interstitial spaces underground, the minimum requirement is a
TF 200; larger ones can also be used.
Type
Max. volume (liters) of the interstitial space with
TF 200
TF 400
TF 600
TF 1200
DLR-P 1.1
400
750
1150
2600
DLR-P 1.5
300
650
800
1850
DLR-P 2.0
DLR-P 2.3
250
480
700
1600
DLR-P 2.5
DLR-P 3.0
230
450
600
1400
DLR-P 3.5
150
250
400
950
DLR-P 4.5
4.6
Displays and Controls
4.6.1 Display
Signal
lamps
Operating
Condition
Alarm
condition
Alarm, audible
alarm
acknowledged
Malfunction
OPERA-
TION:
green
ON
ON
ON
ON
ALARM:
red
OFF
ON
BLINKING
ON
LED
yellow
Not used or, if dry filter monitoring is connected, yellow and red flash
alternately.
Design and Function