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 filled
-40 °F to +140 °F (-40 °C to +60 °C) - silicone filled

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 filling

Glycerine 99.7%