3 exchanging the electronics module – VEGA VEGACAL 65 For connection to a signal conditioning instrument User Manual

Page 23

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23

7 Maintenance and fault rectification

VEGACAL 65 • For connection to a signal conditioning instrument

30320-EN-130917

Error

Cause

Rectification

Current signal

>22 mA

Short-circuit

due to bridging

by conductive

buildup between

process fitting and

electrode

Remove buildup - if necessary, mount

a protective tube

Shortcircuit in the

probe, e.g. be-

cause of moisture

in the housing

Remove the electronics module.

Check the resistance between the

marked plug connections. See the fol-

lowing instructions.

Electronics mod-

ule defective

Exchange the instrument or send it in

for repair

Remove the electronics module. Check the resistance between the

two plug connections.
There must no longer be a connection (high impedance). If there is

still a connection - exchange the instrument or return it for repair

1 2

3

Fig. 13: Check the resistance in the probe
1 Shielding

2 Probe

3 Ground potential

In Ex applications, the regulations for the wiring of intrinsically safe

circuits must be observed.

Depending on the reason for the fault and the measures taken, the

steps described in chapter "Set up" may have to be carried out again.

7.3 Exchanging the electronics module

If the electronics module is defective, it can be replaced by the user.
In Ex applications only one instrument and one electronics module

with respective Ex approval may be used.
If there is no electronics module available on site, one can be ordered

from the VEGA agency serving you.

Check the resistance in

the probe

Reaction after fault recti-

fication

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