Specifications; Design And Function - WIKA 73 Serie Manual De Instrucciones

3. Specifications / 4. Design and function

3. Specifications

Specifications
GB
Measuring element
Nominal size
Instrument version
Model A7x
■
Model R7x
■
Model S7x
■
Model F7x
■
Model Q7x
■
Permissible ambient
temperature
Working pressure
Continuous load (1 year)
■
short term (max. 24 h)
■
Case, ring
Stem, process connection
Ingress protection
per EN 60529/ IEC 529
For further specifications see WIKA data sheets TM 73.01 or
TM 74.01 and order documentation.

4. Design and function

4.1 Description
The gas actuated thermometer consists of a stem, capillary and
Bourdon tube in the casing. These parts are combined to form a
single unit. The entire measuring system is filled with an inert gas
under pressure.
A change in temperature will cause a change in internal pressure
in the stem. The pressure deforms the measuring spring and the
deflection is transferred to the pointer via a dial movement.
10
Model 73
Gas-pressure inert gas filling, physiologically
safe
100, 160, 144 x 144
Back mount (axial)
Lower mount (radial)
Back mount, adjustable stem and dial
Instruments with capillaries
Instruments in panel mounting design
0 ... 40 °C
Measuring range (DIN EN 13190)
Scale range (DIN EN 13190)
Stainless steel
Stainless steel 1.4571
IP 65
IP 66 (liquid-filled)
WIKA operating instructions models 73, 74 (ATEX)
Model 74
100
Stainless steel 1.4435
IP 66