Model 312.25

Hinged Ring Test Gauge

Brass Wetted Parts

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  • Pressure monitoring panels
  • Suitable for gaseous or liquid media that will not obstruct the pressure system or attack copper alloy parts
  • Process industry: chemical/petrochemical, power stations, mining, on and offshore, environmental technology, mechanical engineering and plant construction

Product features

  • Hinged ring for access to adjustable knife edge pointer
  • Durable aluminum case and mirror band dial
  • Positive pressure ranges to 600 psi (40 bar)


ASME B40.100

4½” (115) dial size

Accuracy class
± 0.25% of span (ASME B40.100 Grade 3A)

Vacuum / Compound to 200 psi (16 bar)
Pressure from 15 psi (1 bar) to 600 psi (40 bar)
or other equivalent units of pressure or vacuum

Working pressure
Steady: full scale value
Fluctuating: 0.9 x full scale value
Short time: 1.3 x full scale value

Operating temperature
Ambient: -40°F to +140°F (-40°C to +60°C)
Medium: +212°F (+100°C) maximum

Temperature error
Additional error when temperature changes from reference temperature of 68°F (20°C) ±0.4% of span for every 18°F (10°K) rising or falling.

Weather protection
Weather resistant (NEMA 3 / IP54)

Pressure connection
Material: copper alloy
Lower back mount (LBM)
1/4” or 1/2” NPT with M4 internal tap

Bourdon tube
Material: copper alloy

Stainless steel. Internal stop pin at 1.1 x full scale

White aluminum with black lettering, stop pin at 6 o’clock

Black aluminum, adjustable

Black-painted aluminum with 3 threaded mounting bolts.
Solid front, blowout back safety case. 304 stainless steel blowout back plate

Hinged ring
Black-painted steel with knurled clamping screw

Flat instrument glass with silicone rubber gasket

Mounting bolts
10-24 UNC threads

Hinged Ring Test Gauge<br>
Model 312.25

Hinged Ring Test Gauge
Model 312.25

  • Hinged Ring Test Gauge<br>
Model 312.25
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