6
Electrical connection
The signal is transmitted via a coaxial cable. On
the sensor side, the cable is assembled with a
TNC plug and, if necessary, equipped with pro-
tective caps. The other end of the cable is either
equipped with a measuring device plug or open
for the terminal connection in a stationary signal
evaluation device.
Connect the sensor
• Screw the TNC connector on the sensor and
tighten by hand.
• If the sensor is permanently installed, push the
protective cap (VIB 6.700 / VIB 6.710) over the
plug and hermetically seal the connection with
clamp rings (VIB 6.720 / VIB 6.721).
VIB 6.700
VIB 6.721
VIB 6.720
VIB 6.720
VIB 6.710
Lay the cable
• Have the electrical connection established by a
qualified electrician exclusively.
• Observe the regulations for setting up electrical
systems.
• Do not kink, pinch, knot, twist or mechanically
overload the cables.
• It is preferable to lay the cable in a cable duct or
protective tube.
• Use cable ties and Velcro fasteners to fix the ca-
bles in place.
• Do not lay cables parallel to power lines. Adhere
to the minimum spacing (> 1 m).
• Lay a loop with sufficient reserve traction ahead
of a cable gland.
• Label the cable ends to avoid getting them
mixed up
Extend the cable
• Observe the maximum cable lengths (see the
device installation manual).
• Use appropriate coaxial cables for extension
purposes.
• Connect the cable ends inside a protective ter-
minal housing.
• Mount the metallic protective terminal housing
so that it is electrically insulated. With regard to
installation
outside
the Ex-zone, lay the shield
wire of the incoming and outgoing line on the
protective terminal housing.
EMC protection
• Use triaxial cables in environments subject to a
strong electromagnetic load.
• Keep the coaxial cable a short distance from the
sensor.
• Connect the triaxial cable and the coaxial cable
in a protective terminal housing.
• Mount the protective terminal housing in the
vicinity of the sensor.
STRING No.
String No.
STRING No.
String No.
coaxial
triaxial
Prot. terminal housing
VIB 6.770/13
