WIKA RTD User Manual

3345267.08 06/2011 GB/D
36 WIKA operating instructions RTD and TC, intrinsically safe designs
GB
10. Maintenance and cleaning
10.1 Maintenance
These thermometers are maintenance-free.
Repairs must only be carried out by the manufacturer.
10.2 Cleaning
CAUTION!
■
Clean the instrument with a moist cloth. This applies in particular to thermometers
with a housing made of plastic and cable probes with plastic-insulated connection
lead, to ensure that any risk of electrostatic discharge is avoided.
■
Electrical connections must not come into contact with moisture.
■
Wash or clean the dismounted instrument before returning it, in order to protect
sta and the environment from exposure to residual media.
■
Residual media in dismounted instruments can result in a risk to persons, the
environment and equipment. Take sucient precautionary measures.
For information on returning the instrument, see chapter "12.2 Returns".
11. Faults
Faults Causes Measures
No signal/ line break Mechanical load too high or
overtemperature
Replace probe or measuring insert with
a suitable design
Erroneous measured
values
Sensor drift caused by
overtemperature
Replace probe or measuring insert with
a suitable design
Sensor drift caused by chemical
attack
Use a design with thermowell
Erroneous measured
values (too low)
Entry of moisture into cable or
measuring insert
Replace probe or measuring insert with
a suitable design
Erroneous measured
values and response
times too long
Wrong mounting geometry, for
example mounting depth too
deep or heat dissipation too high
Temperature-sensitive area of the
sensor must be inside the medium, and
surfaces must be isolated.
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
Replace probe or measuring insert
with a suitable design, for example
equipped with a strain relief or a thicker
conductor cross-section
10. Maintenance and cleaning / 11. Faults

WIKA RTD Specifications

General

Brand	WIKA
Model	RTD
Category	Measuring Instruments
Language	English