Vega VEGABAR 65 4 … 20 mA_HART Bedienungsanleitung PDF herunterladen (Seite 16)

Caution:

No greas

e should be used when screwing the NPT cable gland or

steel tube into the threaded insert. Standard grease can contain

additives that corrode the connection between threaded insert and

housing. This would inﬂuence the stability of the connection and the

tightness of the housing.

If screened cable is necessary, connect the cable screen on both ends

to ground potential. In the sensor, the screen must be connected

directly to the internal ground terminal. The ground terminal on the

outside of the housing must be connected to the potential equalisation

(low impedance).

If potential equalisation currents are expected, the connection on the

processing side must be made via a ceramic capacitor (e. g. 1 nF,

1500 V). The low frequency potential equalisation currents are thus

suppressed, but the protective eﬀect against high frequency interfer-

ence signals remains.

Take note of the corresponding installation regulations for Ex

appl

ications. In particular, make sure that no potential equalisation

currents ﬂow over the cable screen. In case of grounding on both sides

this can be achieved by the use of a capacitor or a separate potential

equalisation.

5.2 Connection procedure

Proceed as follows:

1 Unscrew the housing cover

2 If an indicating and adjustment module is installed, remove it by

turning it slightly to the left.

3 Loosen compression nut of the cable entry

4 Remove approx. 10 cm of the cable mantle, strip approx. 1 cm

insulation from the individual wires

5 Insert the cable through the cable gland into the sensor

6 Lift the opening levers of the terminals with a screwdriver (see

following illustration)

7 Insert the wire ends into the open terminals according to the wiring

plan

8 Press down the opening levers of the terminals, you will hear the

terminal spring closing

9 Check the hold of the wires in the terminals by lightly pulling on

them

10 Connect the screen to the internal ground terminal, connect the

outer ground terminal with potential equalisation

Cable screening and

grounding

Select connec-

tion cable for Ex

applications

Single/Double chamber

housing

16 VEGABAR 65 • 4 … 20 mA/HAR

5 Connecting to power supply

27531-EN-081209

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