Models 632.50, 633.50

Low Pressure Capsule Gauges

Process Industry Series

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  • Robust design and weather protection, suitable for outdoor use
  • Suitable for dry, gaseous media that will not attack 316 stainless steel parts
  • Process industry: chemical/petrochemical, power stations, mining, on and offshore, environmental technology, mechanical engineering and plant construction

Product features

  • Zero-adjustment through window
  • All stainless steel construction
  • Low pressure ranges from 1” H2O to 250” H2O (2.5 mbar to 600 mbar)


ASME B40.100 & EN 837-3

2½”, 4” & 6” (63, 100 and 160 mm)

Accuracy class
±1.5% of span

Size 2½ (63 mm): 0...16" H2O (40 mbar) tp 0...250" H2O (600 mbar)
Size 4" (100 mm): 0...6" H2O (16 mbar) tp 0...250" H2O (600 mbar)
Size 6" (160 mm): 0...1" H2O (2.5 mbar) tp 0...250" H2O (600 mbar)

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

Operating temperature
Ambient: -4°F to +140°F (-20°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) ±0.6% of span for every 18°F (10°K) rising or falling.

Weather protection
Weather resistant (NEMA 3 / IP54)
with case filling NEMA 4X / IPP66

Pressure connection
Material: 316L stainless steel
Lower mount (LM) or center back mount (CBM) - 2½” (63 mm)
Lower mount (LM) or lower back mount (LBM) - 4” & 6” (100 mm & 160 mm)
1/4” NPT or 1/2” NPT limited to wrench flat area

Capsule element
Material: 316L stainless steel with Viton sealing ring

Stainless steel

Zero Adjustment Dial
White aluminum with black lettering

Black aluminum

304 stainless steel with stainless steel bayonet ring

Laminated safety glass
Acrylic for case filling (633.50)

Case fill
Silicone - Type 633.50
(only available for full scale ranges ≥ 40” H2O)

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