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: +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.
Weather protection
Weather tight (NEMA 4X / IP 66)
Pressure connection
Material: copper alloy
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
2½” (63 mm) < 870 psi (60 bar): C-shape copper alloy
2½” (63 mm) > 870 psi (60 bar): Helical copper alloy
2½” (63 mm) > 6000 psi (400 bar): Helical stainless steel
4” (100 mm) < 1500 psi (100 bar): C-shape copper alloy
4” (100 mm) > 1500 psi (100 bar): Helical stainless steel
Movement
Copper alloy
Dial
 White aluminum with black lettering; 2½” size with stop pin

Pointer
Black aluminum, adjustable
Case
304 stainless steel with vent plug and stainless steel bayonet ring. Suitable for liquid filling. Case connection sealed with EPDM o-ring (glycerine) or Viton o-ring (dry, silicone).
Window
Laminated safety glass with Buna-N gasket
Case fill
Glycerine 99.7% – Type 213.54
Optional extras
Brass restrictor
Stainless steel front or rear flange
Zinc-plated steel or SS u-clamp bracket (field installable)
Red drag pointer or mark pointer
Silicone or fluorolube case filling
Special connections limited to wrench flat area
Custom dial layout
 Other pressure scales available bar, kPa, MPa, kg/cm² and dual scales