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 (16 bar)
Pressure from 15 psi (1 bar) to 15,000 psi (1000 bar)
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: -40°F to +140°F (-40°C to +60°C) – dry
-4°F to +140°F (-20°C to +60°C) – glycerine filled
-40°F to +140°F (-40°C to +60°C) – silicone filled
Medium: +212°F (+100°C) maximum

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 65)
Pressure connection
Material: 316L stainless steel
Lower mount (LM) or center back mount (CBM) – 2½”
Lower mount (LM) or lower back mount (LBM) – 4”
1/4” NPT or 1/2” NPT limited to wrench flat area
Bourdon tube
Material: 316 stainless steel
< 1,500 psi (100 bar): C-shape,
> 1,500 psi (100 bar): Helical type
Movement
300-series stainless steel
Dial
White aluminum with black lettering; 2½” size with stop pin
Black aluminum, friction adjustable
Case
304 stainless steel with vent plug and polished stainless steel bayonet ring. Suitable for liquid filling. Welded case/socket connection
Window
Laminated safety glass with Buna-N gasket
Case fill
Glycerine 99.7% – Type 233.54

Optional extras
* 316SS restrictor
* Accuracy ±1.0% of full scale (2½” size)
* Stainless steel front or rear flange
* Zinc-plated steel or SS u-clamp bracket (field installable)
* Red drag pointer or mark pointer
* Silicone or Halocarbon oil case filling
* Special connections limited to wrench flat area
* Custom dial layout
 * Other pressure scales available: bar, kPa, MPa, kg/cm² and dual scales