Models 452.50, 453.50

Sealgauge Diaphragm Pressure Gauges

Process Industry Series

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  • 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.

Product features

  • Wide selection of special materials
  • PTFE wetted parts
  • All stainless steel construction
  • High overpressure safety
  • Raised face flange
  • Ideal for crystallizing media


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, max. 600 psi (400 bar)

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

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.

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

Pressure connection and lower diaphragm housing
1” 150# RF flange or
2” 150# RF flange

Case and upper diaphragm housing
Material: stainless steel
Case with blowout disk and stainless steel bayonet ring

Diaphragm element
≤100” H2O (250 mbar): 316 stainless steel with PTFE lining
> 100” H2O (250 mbar): Duratherm (NiCrCo-alloy) with PTFE lining

Material: stainless steel

White aluminum with black lettering

Black aluminum, adjustable-Type 452.50
Black aluminum, non-adjustable-Type 453.50

Laminated safety glass with Buna-N gasket

Case fill
Standard dry
Glycerine 86.5% - Type 453.50

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