Models 432.50, 433.50 Diaphragm pressure gauge


For the process industry, up to 10-fold overload safety, max. 40 bar

  • Process industry: chemical/petrochemical, power stations, mining, on and offshore, environmental technology, mechanical engineering and plant construction


Applications for diaphragm pressure gauges:

  • With liquid filled case for applications with high dynamic pressure pulsations or vibration
  • Suitable in corrosive environments for gaseous, liquid or highly viscous media.
  • Process industry: chemical/petrochemical, power stations, mining, on and offshore, environmental technology, mechanical engineering and plant construction


Special features of diaphragm pressure gauges:

  • Threaded or open flange process connections
  • Wide selection of special materials
  • All stainless steel construction
  • High overpressure safety
  • Ranges from 6″ H20 (16 mbar)


Specifications for diaphragm pressure gauges:


Diaphragm pressure gauges measure gauge, absolute and differential pressure. In processing industries, they can be installed in applications with highly corrosive, viscous media.

Diaphragm pressure gauges are ideal for these harsh conditions because the media can clog the narrow presure ports of threaded connections of Bourdon tube instruments as well as the internals of the tube.

To prevent such clogging, diaphragm pressure gauges are connected to the process with an open flange. This configuration provides a large pressure chamber, which prohibts media from settling.

EN 837-3

4” & 6” (100 & 160 mm)

Accuracy class
± 2.5% of span

Vacuum / Compound to 300 psi (20 bar)
Pressure from 6” H2O (16 mbar) to 100″ H2O (250 mbar), 6″ (160 mm) flange diameter
Pressure from 6 psi (400 mbar) to 360 psi (25 bar),
4” (100 mm) flange diameter
or other equivalent units of pressure or vacuum

Working pressure
Steady: full-scale value
Fluctuating: 0.9 x full-scale value

Overpressure safety
5 x full-scale value, not exceeding 600 psi (40 bar)

Operating temperature
Ambient: -4°F to +140°F (-20oC to +60oC)
Medium: +212°F (+100oC) maximum
Storage: -40o to +158°F (-40oF to +70oC)
-4oF to + 158oF (-20oC to +70oC) for
ranges ≤25 H2O (60mbar)

Temperature error

Additional error when temperature changes from reference temperature of 68°F (20°C) ±0.8% of span for every 18°F (10°K) rising or falling.




Diaphragm pressure gauges, also called sealgauges, are suitable for low pressure and overpressure conditions.

WIKA’s standard design diaphragm pressure gauges (in stainless steel or Inconel) meet NACE 0175 standards, up to 120° C and are suitable for sour gas applications.


Weather protection

Weather resistant (NEMA 3 / IP54) – dry case
Weather tight (NEMA 4X / IP66) – liquid-filled case

Case and upper diaphragm housing
Material: stainless steel
Case with pressure relief disc and stainless steel bayonet ring

Pressure connection and lower diaphragm housing
Material: 316L SS
Lower mount (LM)
½” NPT female

Diaphragm element
≤ 100” H2O (250 mbar): 316 SS with PTFE lining
> 100” H2O (250 mbar): Inconel® (NiCr-alloy) with PTFE lining
All ranges with FPM (Viton) sealing gasket

Material: stainless steel

White aluminum with black lettering

Black aluminum, adjustable – Type 432.50
Black aluminum, non-adjustable – Type 433.50

Laminated safety glass with Buna-N gasket

Case fill
Standard dry
Glycerine 86.5% – Type 433.50

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