Thermometers with switch contacts

Wherever the process temperature has to be indicated locally and, at the same time, limit values must be monitored, thermometers with switch contacts find their application. The switch contacts make or break the circuit dependent upon the pointer position of the indicating measuring instrument. If the reading is significantly above or below a set value, they trigger an alarm, hence also the term “alarm contact”. The instruments are also suitable for starting, stopping or switching processes.

Sales contact

WIKA Instrumentation (M) Sdn. Bhd.

Tel.:
+603 5590 6666
Fax:
1700 81 4140
info@wika.my

FAQ

What mechanical influences, other than the actuation of switch contacts, can cause measuring errors in bimetal thermometers?

In helical bimetal spring designs, a stroke movement of the pointer may occur, which may lead to the pointer touching on the dial or the window.  With the assistance of modern design and manufacturing techniques, such errors are avoided nowadays.

Why must the clearance between the thermowell stem wall and the bimetal coil be as low as possible?

Since the heat transfer from the wetted thermowell stem to the bimetallic spring is improved.

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