VEGA VEGASON 54V…56V - Manual (Page 39)

VEGASON 54V … 56V 39
Electrical connection
5 Electrical connection
5.1 Connection and connection
cable
Safety information
As a rule, do the work in the complete ab-
sence of voltage. Always switch off the power
supply before you carry out connecting work
on the ultrasonic sensors. Protect yourself
and the instruments, especially when using
sensors which do not operate with low volt-
age.
Qualified personnel
Instruments which are not operated with
protective low voltage or DC voltage must
only be connected by qualified personnel.
Connection
A standard two or four-wire cable (sensors
with separate supply) with max. 2.5 mm
2 can
be used for connection. Please note that the
connection cables are specified for the ex-
pected operating temperatures in your sys-
tems. The cable must have an outer diameter
of 5 … 9 mm or 3.6 … 8.6 mm, to ensure the
seal effect of the cable entry.
Transducer cable
When wiring the transducer cable, avoid
strong bending of the cable. This is a special
cable which will otherwise be damaged.
Make sure that the cable will not be damaged
during operation. The screened transducer
cables transmit a signal with a voltage of
approx. 1 kV. In Ex areas, a cable damage
can be dangerous.
Earth conductor terminal
The electronics housing of the sensors has a
protective insulation. The earth conductor
terminal and the earth terminal in the electron-
ics housing are galvanically connected with
the metallic transducer diaphragm.
On sensors in version B, the earth conductor
terminal is galvanically connected to the
transducer diaphragm via the transducer
tube when the sensor is completely mounted.
On version C and D, the connection is made
via the cable screen of the transducer cable
and the transducer tube.