612.20 Copper Alloy Capsule Pressure Gauge

Design

• EN837-3

Size

• 2.5″
• 4″
• 6″

Accuracy class

• ± 1.5% of span

Ranges (All ranges not stocked)

• Size 2.5″: (63 mm): 0…10 (25 mbar) to 0…250″ H₂O (600 mbar)
• Size 4″ (100 mm): 0…4″ H₂O (10 mbar) to 0…250″ H₂O (600 mbar)
• Size 6″ (160 mm): 0…2.5″ H₂O (600 mbar) or all other equivalent vacuum or compound ranges

Connection

• Copper alloy
• Size 2½ (63 mm): ¼” NPT lower moutn (LM) or center back moutn (CBM)
• Size 4″ & 6″ (100 mm & 160 mm): ¼” NPT or ½” NPT lower mount (LM) or lower back mount (LBM)

Capsule Element

• Material: copper alloy

Movement

• Copper alloy, nickel-silver pinion gear and shaft. Zero adjustment screw on dial

Dial

• White aluminum with black lettering

Pointer

• Black aluminum (zero adjust on dial. Must remove window to access)

Case

• 304 stainless steel with stainless steel bayonet ring

Weather Protection

• Weather resistant (NEMA 3 / IP 54)

Standard Scales

• in. H₂O/mm H₂O
• oz.-sq. in./mm H₂O
• oz.-sq. in./in. H₂O
• PSI

Window Gasket

• Buna-N

Window

• Flat instrument glass

Working Range

• Steady: Full scale value
• Fluctuating: 0.9 x full scale value

Operating Temperature

• Ambient: -4°F to 140°F (-20°C to 60°C)
• Media: max. 212°F (+100°C) max. 176°F (+80°C) for 4” & 6″ LBM

Temperature error

• Additional error when temperature changes from reference temperature of 68°F (20°C) +0.6% of span for every 18°F (10°C) rising or falling.