Pressure Gauge WIKA Model 422.12


Diaphragm pressure gauges are preferably used for low pressure ranges. Through the large working surface of the circular, corrugated diaphragm element, small pressure ranges can be measured reliably.

The diaphragm pressure gauges are manufactured in accordance with EN 837-3. The robust design is particularly suitable for applications in machine building, plant construction and in the water and wastewater industry. The upper measuring flange with case and the lower measuring flange are made from one cast part, respectively.

The instrument is used for the measurement of gaseous and liquid media that will not attack cast steel.

For the measurement f highly viscous, crystallising or contaminated media, the use of an open connecting flange is recomended. The open connecting flange has the advantage over threaded connection that the pressure port cannot become blocked. With an addition flushing connection on the open connecting flange, the pressure chamber can be easily cleaned.

Measuring system with diaphragm elements, on the grounds of their design, offer good protection from overload, since the diaphragm can support itself against the upper flange. As standard, the diaphragm pressure gauges already feature an overload safety of 3 times the full scale value. Optionally, higher overload safeties can be realised.


  • For measuring points with increased overload
  • The model 423.12 with liquid-filled case is suitable for high dynamic pressure loads and vibrations
  • For gaseous and liquid media
  • For mining, environmental technology, machine building and general plant construction
  • With the open connecting flange option also for contaminated and viscous media


  • Compatible with switch contacs
  • Threaded or open flange process connection
  • Scale ranges from…16 mbar



EN 837-3

Nominal size in mm

100, 160

Accuracy class

Model 422.12: 1.6

Model 423.12: 2.5 (option 1.6)

Scale ranges

0 … 16 mbar to 0 … 250 mbar (flange Ø 160 mm)

0 … 400 mbar to 0 … 40 bar (flange Ø 100 mm)

or all other equivalent vacuum or combined pressure and vacuum ranges

Pressure limitation

Steady: Full scale value

Fluctuating: 0.9 x full scale value

Overload safety

3 x full scale value, however max. 40 bar

Permissible temperature

Ambient: -20 … +60 °C

Medium: +100 °C maximum

Storage: -40 … +70 °C

(scale ranges ≤ 60 mbar: -20 … +70 °C)

Temperature effect

When the temperature of the measuring system deviates from the reference

temperature (+20 °C): max. ±0.3 %/10 K of the span

Ingress protection per IEC/EN 60529

Model 422.12: IP54

Model 423.12: IP65 (with liquid filling)

Process connection with lower measuring flange

Steel, lower mount, G ½ B (male), SW 27

Pressure element

≤ 2.5 bar: Stainless steel 1.4571

> 2.5 bar: Stainless steel 1.4568

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