Diaphragm pressure gauges measure gauge, absolute and differential pressure. In processing industries, they can be installed in applications with highly corrosive, viscous media.

Diaphragm pressure gauges are ideal for these harsh conditions because the media can clog the narrow presure ports of threaded connections of Bourdon tube instruments as well as the internals of the tube.

To prevent such clogging, diaphragm pressure gaugesare connected to the process with an open flange. This configuration provides a large pressure chamber, which prohibts media from settling.  

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, not exceeding 600 psi (40 bar)

Operating temperature
Ambient: -4°F to +140°F (-20^oC to +60^oC)
Medium: +212°F (+100^oC) maximum
Storage: -40^o to +158°F (-40^oF to +70^oC)
               -4^oF to + 158^oF (-20^oC to +70^oC) for  
               ranges ≤25 H₂O (60mbar)

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.

Design
EN 837-3

Nominal Sizes
2", 2½" (63 mm)

Accuracy
+ 1.6% of FSV

Standard Ranges
2":    0...25 INWC (60 mbar) to 0...250 INWC (600 mbar)
2½":    0...10 INWC (25 mbar) to 0...250 INWC (600 mbar)
or all other equivalent vacuum or compound ranges

Standard Scales
In.H₂0/mmH₂0
oz/sq.in/mmH₂0
oz/sq.in/In.H₂0
PSI

Pressure limitation
Steady: Full scale value
Fluctuating: 0.9 x full scale value

Permissible temperature
Ambient:-4°F...+140°F (-20...+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.

Ingress protection
NEMA2 (IP 32 per EN 60529 / lEC 529)

Process connection
Model 611.10: Copper alloy
Model 631.10: Stainless steel
Lower mount (LM) or back mount (CBM)
(2": Only back mount)
¼" NPT (male), 14 mm flats

Design
ASME B40.100 & EN 837-1

Sizes
4", 6” (100 mm, 160 mm)

Accuracy class
± 1% of span (ASME B40.100 Grade 1A)

Ranges
Vacuum / Compound to 200 psi (16 bar)
Pressure from 15 psi (1 bar) to 15,000 psi (1,000 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: +140°F (+60°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.