VEGA VEGACAL 65 For connection to a signal conditioning instrument - Manual (Page 23)

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