M.:
Date: Feb. 98
Page: 17
Vacuum Leak Detector
VL - H9
SGB
Sicherungsgerätebau
GmbH
57076 Siegen
No. in the leak detector
Designation in ZME
Meaning
Potential free contact
1 A1
Alarm contact
Potential free contact
2 A2
Alarm contact
Mains N
3 N
Voltage supply
Mains L
4 L1
Voltage supply
5 PE
Earth conductor
Table 4: Connection leak detector
(7) Each channel occupied by a leak detector must be activated via the relevant coding bridge in the
central signalling unit (compare 6.5 no. (3)).
6.7 Installation of the connection line between leakage probe FDL30 and signalling unit VL-
H9/ME-MV-LS
(1) Requirements of the line:
Colour of the outer sheath:
blue (intrinsically safe circuit)
No. of wires:
2 (the wires should be distinguishable)
Max. specific resistance:
25
Ω
Cross section:
0.75 - 1.5 mm²
(2) The connection line between the leakage probe and the signalling unit must be firmly installed.
Plug-in or switch-type connections are not permitted.
(3) In the signalling unit, connection is made to the blue terminals provided for this purpose.
No. in the leakage probe
Designation in ME
Meaning
1 -
-
intrinsically safe -
2 +
+
intrinsically safe +
Table 5: Connection leakage probe
Where a shielded cable is used, the shield is only connected to the earth terminal in the leakage
probe.
(4) If the connection line is laid underground in a sheath-pipe, the inlet and the outlet of the sheath-
pipe must be closed in a gastight manner, in order to prevent explosive vapours from being
'carried over'.
23 von 50
