Wika 73 Uživatelský manuál stáhnout pdf (Strana 10)

11591367.02 05/2012 GB/D/F/E

10 WIKA operating instructions models 73, 74 (ATEX)

3. Specications

Specications

Model 73 Model 74

Measuring element Gas-pressure inert gas lling

Nominal size 100, 160, 144 x 144 100

Instrument version

■

Model A7x

■

Model R7x

Back mount (axial)

Lower mount (radial)

■

Model S73

■

Model F73

Back mount, adjustable

stem and dial

Instruments with capillaries

Permissible ambient

temperature

0 ... 40 °C

Working pressure

■

Continuous load (1 year)

■

short term (max. 24 h)

Measuring range (EN 13190)

Scale range (EN 13190)

Case, ring

Stainless steel 1.4301

Stem, process connection

Stainless steel 1.4571

Stainless steel 1.4435

Ingress protection

per EN 60529/ IEC 529

IP 65

IP 66 (liquid-lled)

IP 65

(option: IP 66)

For further specications 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 lled 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

deection is transferred to the pointer via a dial movement.

3. Specications / 4. Design and function

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