Model 422.12, 423.12 Diaphragm Pressure Gauge

Brand: WIKA Instruments Ltd.
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.
Features
  • Compatible with switch contacts.
  • Process connection thread or open flange.
  • Scale ranges from 0 … 16 mbar.
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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.
Features
  • Compatible with switch contacts.
  • Process connection thread or open flange.
  • Scale ranges from 0 … 16 mbar.

Specifications

Design

  • EN 837-3

Nominal Size in mm

  • 160
  • 100

Accuracy Class

  • Model 423.12: 2.5 (option 1.6)
  • Model 422.12: 1.6

Scale Ranges

  • or all other equivalent vacuum or combined pressure and vacuum ranges
  • 0 to 400 mbar to 0 to 40 bar (flange Ø 100 mm)
  • 0 to 16 mbar to 0 to 250 mbar (flange Ø 160 mm)

Pressure Limitation

  • Fluctuating: 0.9 x full scale value
  • Steady: Full scale value

Overload Safety

  • 3 x full scale value, however max. 40 bar

Permissible Temperature

  • Storage: -40 ... +70° C (scale Ranges ≤ 60 mbar: -20 ... +70° C)
  • Medium: +100° C maximum
  • Ambient: -20 … +60° 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 423.12: IP65 (with liquid filling)
  • Model 422.12: IP54

Process Connection with Lower Measuring Flange

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

Pressure Element

  • > 2.5 bar: Stainless steel 1.4568
  • ≤ 2.5 bar: Stainless steel 1.4571

Pressure Chamber Sealing

  • NBR

Movement

  • Copper alloy, wear parts argentan

Dial

  • Aluminium, white, black lettering

Pointer

  • Aluminium, black

Case with Upper measuring Flange

  • Grey cast iron, black

Window

  • Instrument glass

Ring

  • Bayonet ring, stainless steel, black

Filling Liquid (for Model 423.12)

  • Glycerine 86.5 %

Typical Applications

  • 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

Documentation

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