Dwyer A3004 (0-4.0″w.c.) PHOTOHELIC® PRESSURE SWITCH/GAGE

Description

3-in-1 Indicating Gage, Lo-limit and Hi-limit Control

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. 

SPECIFICATIONS

GAGE SPECIFICATIONS
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 SPECIFICATIONS
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
Mounting Orientation:Diaphragm in vertical position. Consult factory for other position orientations.
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.
Set Point Adjustment:Adjustable Knob on face
Agency Approvals:CE, CSA, UL.