Design
ASME B40.100 & EN 837-1
Sizes
2½” & 4” (63 & 100 mm)
Accuracy class

2½”: ± 2/1/2% of span (ASME B40.100 Grade A)

4”: ± 1% of span (ASME B40.100 Grade 1A)

Ranges
Vacuum / Compound to 200 psi
Pressure from 15 psi to 15,000 psi or other equivalent units of pressure or vacuum
Working pressure

2½”: Steady: 3/4 scale value

Fluctuating: 2/3 full scale value

Short time: full scale value

4”: Steady: full scale value

Fluctuating: 0.9 x full scale value

Short time: 1.3 x full scale value

Operating temperature
Ambient: -4 °F to +140 °F (-20 °C to +60 °C) – glycerine flled
-40 °F to +140 °F (-40 °C to +60 °C) – silicone flled
Medium: max. +140 °F (+60 °C)
Temperature
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 tight (NEMA 4X / IP 66)
Pressure connection
Material: copper alloy
Lower mount (LM) or center back mount (CBM) – 2½” (63 mm)
Lower mount (LM) or lower back mount (LBM) – 4” (100 mm)
1/4” NPT or 1/2” NPT limited to wrench flat area
Bourdon tube
2½” (63 mm) < 870 psi (60 bar): C-shape copper alloy
2½” (63 mm) > 870 psi (60 bar): Helical copper alloy
4” (100 mm) < 1,000 psi (70 bar): C-shape copper alloy
4” (100 mm) > 1,000 psi (70 bar): Helical stainless steel
Movement
Copper alloy
Dial
White aluminum with black lettering, 2½” with stop pin
Pointer
Black aluminum

Case
Gold-painted forged brass with integral connection and vent plug
Bezel ring
Gold-plated ABS cover ring (2½”)
Chrome-plated brass cover ring (4”)
Window
Acrylic with Buna-N gasket
Case fll
Glycerine 99.7%
Optional extras
* Brass restrictor
* Front or rear flange
* U-clamp mounting
* Laminated safety glass or flat glass window
* Red drag pointer or mark pointer
* Silicone or Halocarbon Oil case flling
* Special connections limited to wrench flat area