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WIKA operating instructions, models TRxx and TCxx
14150915.08 04/2024 EN/DE/FR/ES
5. Commissioning and operation
5.5 Temperature carry-over from the process
A heat backflow from the process that exceeds the operating temperature of the
transmitter (digital indicator) or case is not permitted and must be prevented by installing
suitable heat insulation or a respectively long neck tube.
Increasing the distance of the connection components to hot surfaces
The neck length (N) is defined as the distance between the lower edge of the
connection head or case and the heat-emitting surface. The expected temperature at
the lower edge of the connection head or case should be a maximum of 80 °C [176 °F].
The conditions for built-in transmitters or displays must be considered, and if needed,
the neck length should be increased.
To help select the minimum neck length, the following standard values have been
determined.
Maximum medium temperature Recommendation for
dimension N
Recommendation for
dimension X
100 °C [212 °F] - -
135 °C [275 °F] 20 mm [0.79 in] 20 mm [0.79 in]
200 °C [392 °F] 50 mm [1.97 in] 50 mm [1.97 in]
> 200 °C [392 °F] ≤ 450 °C [842 °F] 100 mm [3.94 in] 100 mm [3.94 in]
For thermometers fitted with a connection lead, the temperature at the interface with
the connection cable is restricted. This is a max. of 150 °C [302 °F]. To ensure that
the permissible temperature is not exceeded, the dimension X must be selected
accordingly.
3160670.07
tapered threadparallel thread
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