WIKA TW61 - Manual (Page 7)

WIKA operating instructions thermowell, model TW61
11593963.03 03/2014 GB/D/F/E
7
GB
3. Specifications
Specifications Model TW61
Designs of connection Flow-through housing or angular housing
Nominal width of tube Pipe classes per DIN, ISO and ASME BPE
see table of dimensions, chapter 4.2 “Dimensions and
pressure ratings”
Permissible temperature ranges
■ Ambient
■ Medium to be measured
-40 ... +85 °C
-50 ... +250 °C
Materials (wetted parts)
■ Pipes to DIN 11866 series A (metric) and
series B (ISO)
■ Pipes to DIN 11866 series C (ASME BPE)
Stainless steel 1.4435
Stainless steel 316L
Connection to the thermometer Model TR21-B: G 3/8 male
Model TR22-B: M24 x 1.5 rotatable male nut
For further specifications see WIKA data sheet TW 95.61 and the order documentation.
4. Design and function
4.1 Description
The model TW61 thermowell is used to adapt thermometers and measuring inserts to the
process and protects the sensor against harsh process conditions. Furthermore, it enables the
removal of the temperature sensor without having to open the process.
To integrate it into the process, the thermowell is directly orbitally-welded into a pipeline. The
connection ends are smooth and prepared for orbital welding.
In combination with a resistance thermometer, the rotatable threaded connection of the
connection head or the display can be loosened and turned to the desired orientation. The
measuring insert can be withdrawn together with the connection head. In this way, it is possible to
calibrate the entire measuring chain (sensor, transmitter if applicable, connection cable) on site,
without having to disconnect the electrical connection. In addition this avoids having to open the
process, and thus the risk of contamination is minimised.
The thermowell is not piggable.
3. Specifications / 4. Design and function