WIKA operating instructions RTD and TC, intrinsically safe designs
3345267.08 06/2011 GB/D
37
GB
Corrosion Composition of the medium not
as expected or modied or wrong
thermowell material selected
Analyse medium and then select a
more-suitable material or replace
thermowell regularly
Signal interference
Stray currents caused by electric
elds or earth loops
Use screened connecting cables,
increase in the distance to motors and
power lines
Earth circuits Eliminate potentials, use galvanically
isolated transmitter supply isolators or
transmitters
CAUTION!
If deciencies cannot be eliminated by means of the measures listed above, shut
down the instrument immediately, and ensure that pressure and/or signal are no
longer present, and secure the instrument from being put back into operation
inadvertently. In this case, contact the manufacturer.
Should a return be necessary, please observe the information in chapter
"12.2 Returns".
12. Dismounting, return and disposal
WARNING!
Residual media in dismounted instruments can result in a risk to persons, the
environment and equipment. Take sucient precautionary measures.
12.1 Dismounting
WARNING!
Risk of burns!
Let the instrument cool down suciently before dismounting it! When dismounting it,
there is a risk that dangerously hot pressure media may escape.
Connections must only be opened when the instrument is depressurised and has cooled down.
The thermometer or the measuring insert can be removed from the thermowell. The thermowell
itself should only be removed from the process once it is in a depressurised state. For
thermometers without thermowell, the system must have been depressurised, cooled down and
be free of hazardous materials.
11. Faults / 12. Dismounting, return and disposal
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