DWYER Differential pressure gauge Photohelic® 3 series
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NG # 00306-HW-DWYER-007
Manufactured by:
Series A3000 Photohelic® Pressure Switch/Gage 3-in-1 Indicating Gage, Lo-limit and Hi-limit Control
Specification
Service Air and non-combustible, compatible gases Wetted Materials Consult Factory Accuracy ±2% of FS at 70°F (21.1°C). ±3% on -0 and ±4% on -00 models Pressure Limits -20" Hg. to 25 psig (-0.677 to 1.72 bar). MP option; 35 psig (2.41 bar), HP option; 80 psig (5.52 bar). Temperature Limits 20 to 120°F. (-6.67 to 48.9°C). -20 to 120°F (-28 to 48.9°C) with low temperature option. Process Connections 1/8" female NPT Size 4" (101.6 mm) dial face, 5" (127 mm) O.D. x 8-1/4" (209.55 mm) Weight 4 lb (1.81 kg) Switch Type Each setpoint has 2 Form C relays (DPDT). Repeatability ±1% of FS Electrical Rating 10 A @ 28 VDC, 10 A @ 120, 240 VAC Electrical Connections Screw terminals. Use 167°F (75°C) copper conductors only Power Requirements 120 VAC, 50/60 Hz; 240 VAC & 24 VAC power optional Mounting Orientation Diaphragm in vertical position. Consult factory for other position orientations Set Point Adjustment Adjustable knobs on face Compliance CE, CSA, UL
Description
The Series A3000 Photohelic® Switch/Gages function as versatile, highly repeatable pressure switches combined with a precise pressure gage employing the time-proven Magnehelic® gage design. The Photohelic® switch/gage measures and controls positive, negative or differential pressures of air and compatible gases. Standard models are rated to 25 psig (1.7 bar) with options to 35 (2.4) or 80 (5.5 bar) psig. Two phototransistor actuated, DPDT relays are included for low/high limit control. Easy to adjust set point indicators are controlled by knobs located on the gage face. Individual set point deadband is one pointer width - less than 1% of full scale. Set points can be interlocked to provide variable deadband - ideal for control of fans, dampers, etc. Gage reading is continuous and unaffected by switch operation, even during loss of electrical power. Choose from full scale pressure ranges from a low 0-.25 in (0-6 mm) w.c. up to 30 psi (21 bar).