EN
12099431.07 11/2018 EN/DE/FR/ES
WIKA operating instructions models 73, 74, 75
5
2. Design and function
2.1 Overview
Case
Capillary
Dial
Process connection
Pointer
Stem
Instrument mounting bracket
2.2 Description
The gas-actuated thermometer consists of a stem, capillary and
Bourdon tube in the case. These parts are combined to form a single
unit. The entire measuring system is lled with an inert gas under
pressure.
Any change in temperature causes a change in internal pressure in the
stem. The pressure deforms the measuring tube and the deection is
transferred to the pointer via a movement.
Example: Model F73.100 Example: Model R74.100
2. Design and function
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