WIKA operating instructions RTD and TC, intrinsically safe designs
3345267.08 06/2011 GB/D
13
GB
4. Design and function
4.1 Description
These thermometers (resistance thermometers and thermocouples) detect temperatures in
processes.
Depending on their design, these thermometers are suitable for low, medium and high process
requirements in hazardous areas.
Insulated measuring point
The model TRxx or model TCxx thermometers consist of a welded tube, a mineral-insulated
sheathed cable or ceramic-insulated thermal wires (in which the temperature sensor is located,
embedded in a ceramic powder), a temperature-resistant sealing compound, cement compound
or a thermal transfer paste.
Alternatives:
The measuring insert or the cable probe can also be provided in a tubular form. In this case, the
sensor is located in a welded tube and embedded in a ceramic powder, heat-conducting paste or
in a sealing compound suitable for this purpose.
The measuring insert for high-temperature thermocouples can also be assembled from thermal
wires insulated with ceramic rods or ceramic beads. The ceramic tube is cemented into a metallic
support tube using a temperature-resistant cement.
Thermocouples, non-insulated (grounded)
For special applications, for example surface temperature measurements, the sensors are in
direct contact with the protective sleeve, or the measuring points of thermocouples are welded to
the bottom (see chapter "7.1.1 Special conditions of use (X conditions)").
Measuring point insulated (ungrounded) Measuring point not insulated (grounded)
Thermocouple
Thermocouple
Measuring point
Measuring point
Sheath Sheath
AI203 powder
MI line
V-Pad
welded with
ller
V-Pad version
Measuring point not insulated
4. Design and function
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