WIKA TR50 表面安装热电阻温度计
Surface resistance thermometer
Model TR50
Resistance thermometer
Fig. : Model TR50-O with metal contact block
Fig. bottom: Model TR50-Q with worm-drive hose clip
Applications
■ To measure surface temperatures on flat surfaces or pipes, in both laboratory and industrial applications
Special features
■ Application ranges up to max. 250 °C (option: 600 °C)
■ Easily exchanged, no thermowell necessary
■ For screw-fitting, welding or using a worm-drive hose clip
■ Cable from PVC, silicone or PTFE
■ Explosion-protected versions Ex i, Ex n and
NAMUR NE24
Description
Probe
In versions for flat surfaces, the probe is mounted into a contact block, which can be screwed or welded to the vessel surface. Versions for pipes are simply fixed using a worm-drive hose clip.
Cable
There are various insulating materials available to suit any particular environmental conditions. The cable end is made up, ready for connection, but can also be fitted with a plug or connected to a field housing, as options.
Sensor
Sensor connection method
■ 2-wire The lead resistance is recorded as an error in the measurement.
■ 3-wire With a cable length of approx. 30 m or longer,measuring errors can occur.
■ 4-wire The internal lead resistance of the connecting wires is negligible.
Sensor tolerance value per DIN EN 60751
■ Cl B
■ Cl A
■ Cl AA
The combinations of a 2-wire connection with cl A or cl AA are not permissible.
For detailed specifications for Pt100 sensors, see Technical
Information IN 00.17 atwww.wika.com.
Process connection
Model TR50-O, with metal contact block
Design: contact block for screwing or welding to a flat
surface
Material: stainless steel
Dimensions: see drawings
other versions on request
Model TR50-P, with weld-on sheet
Design: weld-on sheet
Material: stainless steel
Dimensions: see drawings
other versions on request
Model TR50-Q, with worm-drive hose clip
Design: worm-drive hose clip
Material: stainless steel
Dimensions: see drawings
other versions on request
Model TR50-T, with washer
Design: centrally-drilled washer
Material: stainless steel
Dimensions: see drawings
other versions on request
Metallic sensor
Material: stainless steel
Diameter: 3 or 6 mm
Length: selectable
Regardless of the design, the first 60 mm of the sensor tip must not be bent.
Surface resistance thermometers can be constructed in two differentways:
■ Tubular design
The tubular design features a rigid construction to the metal sensor tip; therefore tubular designs must not be bent.Internally, the measuring resistor is connected directly to an insulated lead, therefore tubular-design TR50 resistance thermometers can only be used up to the temperatures specified for the cable (see operating temperatures).
■ Sheathed design
In sheathed resistance thermometers the flexible part of the sensor is a mineral-insulated cable (MI-cable).It consists of a stainless steel outer sheath, which contains the insulated internal leads, embedded within a high-density ceramic compound.
The measuring resistance is connected directly to the internal leads of the sheathed cable and is, therefore, also suitable for use at higher temperatures.
Due to their flexibility and the all possible diameters,sheathed resistance thermometers can be used in locations that are not easily accessible, since, with
the exception of the sensor tip and the pot seal of the connection cable, the sheath can be bent to a radius of three times the diameter of the cable.
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