Sealgauge Diaphragm Pressure Gauges

Design
EN 837-3

Sizes
4” & 6” (100 & 160 mm)

Accuracy class
± 2.5% of span

Ranges
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: -40^oF+158°F (-40^cC to +70^oC)
-4^oF to + 158oF (-20^oC to + 70^oC) 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

Movement
Material: stainless steel

Dial
White aluminum with black lettering

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

Window
Laminated safety glass with Buna-N gasket

Case fill
Standard dry
Glycerine 86.5% - Type 453.50