50675567 | 332.25 4.5 30INHG VAC 1/4 B | Wika

Design
ASME B40.100

Sizes
4½” (115 mm)

Accuracy class
Ranges: ± 0.25% of span (ASME B40.100 Grade 3A) for
pressure range ≤ 600 psi (40 bar)
± 0.50% of span (ASME B40.100 Grade 2A) for
pressure range > 600 psi (40 bar) and < 2,000 psi (160 bar)
± 0.25% of span (ASME B40.100 Grade 3A) for
pressure range ≥ 2,000 psi (160 bar)

Ranges
Vacuum / Compound to 200 psi (16 bar)
Pressure from 15 psi (1 bar) to 20,000 psi (1,600 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: 316L stainless steel
Lower back mount (LBM)
1/4” or 1/2” NPT with M4 internal tap

Bourdon tube
Material: 316L stainless steel
≤ 1,000 psi (70 bar): C-shape,
> 1,000 psi (70 bar): Helical

Movement
Stainless steel. Internal stop pin at 1.1 x full scale

Dial
White aluminum with black lettering, mirror band dial and stop pin at 6 o’clock

Pointer
Black aluminum, adjustable

Case
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

Window
Flat instrument glass with silicone rubber gasket

Mounting bolts
10-24 UNC threads