SGB VLXE Ex M Series, Documentation

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28/07/2020
VACUUM LEAK DETECTOR VLXE .. Ex M and VLXE .. Ex MMV - 13 -
4. Design and Function
Design
Interior view, with:
18
Denotation flame arrester
20 Three-way valve in suction line
21 Three-way valve in the measuring line
60 Vacuum pump
75 Display board
139 Keypad
147
Pressure-resistant housing with control
165 Separating barrier
169 Data bus module (BM-i)
4.2 Normal operating condition
The vacuum leak detector is connected to the interstitial space via
suction, measuring and connection line(s). The vacuum generated by
the pump is measured and controlled by a pressure sensor.
When the operating vacuum is reached (Pump OFF), the pump shuts
off. The vacuum slowly drops due to slight, unavoidable leaks in the
leak detector system. When the Pump ON switching value is reached,
the pump turns on and the interstitial space is evacuated until the op-
erating vacuum is reached (Pump OFF).
In normal operating condition, the vacuum swings between the Pump
OFF and Pump ON switching values, with short periods when the
pump is run and longer standstills, depending on the tightness and
temperature fluctuations of the entire unit.
Design and Function
75
20
21
165
144
18
60
139
169