Wika TR12-M Manual do Utilizador descarregar pdf (Página 22)

14064370.01 08/2013 GB/D

WIKA operating instructions models TR12, TC1222

8. Faults

Faults Causes Measures

No signal/

line break

Mechanical load too high or overtem-

perature

Replacement of the sensor or the meas-

uring insert with a suitable version

Erroneous measured

values

Sensor drift caused by overtemperature

Replacement of the sensor or the meas-

uring insert with a suitable version

Sensor drift caused by chemical attack

Use of a suitable thermowell

Erroneous measured

values (too low)

Entry of moisture into cable or measur-

ing insert

Replacement of the sensor or the

measuring insert with a suitable version

Erroneous measured

values and response

times too long

Wrong mounting geometry, for example

mounting depth too deep or heat

dissipation too high

The temperature-sensitive area of the

sensor must be inside the medium

Deposits on the sensor or thermowell

Remove deposits

Erroneous measured

values (of thermocouples)

Parasitic voltages (thermal voltages,

galvanic voltage) or wrong equalisation

line

Use a suitable equalisation line

Measurement signal -

“comes and goes”

Cable break in connecting cable or

loose contact caused by mechanical

overload

Replacement of the sensor or

measuring insert with a suitable design,

for example tted with strain relief or a

thicker conductor cross-section

Corrosion Composition of the medium not

as expected or modied 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 of screened connecting cables,

increase in the distance to motors and

power lines

Earth circuits Elimination of potentials, use of

galvanically isolated transmitter supply

isolators or transmitters

CAUTION!

If faults 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.

If a return is needed, follow the instructions given in chapter 9.2 “Return”.

8. Faults

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