VACUUM LEAK DETECTOR VL ..
4
- 4 -
2.5. Tanks with pressures up to 5 bar (in liquid leak case)
G
roup
Type of tank
Installa-
tion ex-
ample
Suitable
leak de-
tector
type
Use limits
L
Vertical cylindrical tanks with double bottom (leak
detection lining), leak detector connected at the bot-
tom (e.g. GFK tanks or tanks according to DIN
4119)
L
– 01
VL 255
Tank height:
25 m
M
As L, but suction and measuring pipe as joint pipe
leading from the tank (with node point)
M
– 01
N
As L, but with several (parallel) pipes leading from
the tank. Interstitial space divided into segments.
2.6. Tanks with superimposed pressures up to 10 bar
G
roup
Type of tank
Installation ex-
ample
Suitable leak
detector type
Use limits
O
Versions as under 2.4, in as far as overlay
pressures up to 10 bar are permissible in
the respective tank.
As 2.4, but
with
solenoid valve(s):
O
– 01
VL 34 E
to
VL 570 E
See 2.4
3. Functional description
3.1. Normal operation
The vacuum leak detector is connected to the interstitial space via the suction and measuring
line, possibly also via the connection line(s). The vacuum generated by the pump is measured
and controlled by a pressure sensor.
When the operating vacuum (pump OFF) has been reached, the pump is switched off. Due to
slight, unavoidable leaks in the leak detection system, the vacuum begins to fall slowly. When
the swi
tching value for “pump ON” has been reached, the pump is switched on and the intersti-
tial space evacuated until the operating vacuum (pump OFF) has been reached again.
During normal operation the vacuum moves between the switching value pump OFF and the
switching value pump ON, with the pump running for a short time and then switching off for a
longer time, depending on the tightness and temperature fluctuations in the complete system.
3.2. Air leak
If an air leak occurs (in the outer or inner wall, above the liquid level) the vacuum pump switch-
es on in order to re-establish the operating pressure. If the air flow leaking into the pipe exceeds
the limited feed flow of the pump, the pump remains on continuously.
Содержание VL 230
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Страница 22: ...Ex 73 73 73 101 101 101 68 03 43 27 97 17 12 2002 A 01 60 102 76 30 21 61 20 H max...
Страница 23: ...Ex 73 73 73 68 03 43 27 97 17 12 2002 B 01 H max H max 21 20 71 36 69 01 01 2 09 H max...
Страница 24: ...Ex 73 101 43 03 68 33 17 12 2002 D 01 H max 27 21 20 71 69 01 09 H max...
Страница 25: ...Ex 73 43 03 68 17 12 2002 E 01 H max 27 21 20 71 69 01 09 H max...
Страница 26: ...Ex 17 12 2002 H 01 27 43 03 68 93 89 101 73 27 27 27 21 20 71 69 01 09...
Страница 30: ...18 01 2002 L 01 27 02 82 101 73 33 68 43 03 Ex 21 20 71 69 01 09...
Страница 31: ...18 01 2002 M 01 73 Ex 21 20 71 69 01 09 95 96 74 02 43 03 68 27 27 L max max 1 m...
Страница 32: ...Ex 73 101 68 03 43 27 18 12 2002 O 01 21 20 71 36 69 01 01 2 09 27 33 44 p 10 bar...
Страница 33: ...21 02 2017 SL 853 600 2 6 4 5 3 11 12 1 AC DC 105 106 102 71 01 69 24 1 24 3 59 09 76 17 60 Rp...
Страница 35: ...22 84 85 85 22 52 98 98 0 Kl 1 0 17 12 2002 P 115 392 21 21 20 20 90 90...
Страница 43: ...15 07 2008 W 01 27 02 82 101 111 112 73 33 68 43 03 Ex 21 20 71 69 01 09 50 150 C...
Страница 44: ...Ex 73 101 112 68 43 97 15 07 2008 W 02 21 44 20 71 36 69 01 01 2 09 50 150 C...
Страница 48: ...8 200 260 300 T 140 220 28 06 2005 Dimension Drilling...
