Dwyer Series A3000-0 Photohelic Pressure Switch

About Dwyer Series A3000-0 Photohelic Pressure Switch

Dwyer Series A3000-0 Photohelic Pressure Switch Gage 0-.50" w.c.

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. Single pressure 36000S models measure to 6000 psig (413 bar) with a 9000 psig (620 bar) rating. 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" (0-6 mm) w.c. up to 30 psi (21 bar); single positive pressure to 6000 psig (413 bar).

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Dwyer A3000-0 0-.50" w.c.

Features

Measure 4 to 20 mA signals without "breaking the loop"

Measure mA signals for PLC and control system analog I/O

Dual backlit display with both mA measurement and percent of 4 to 20 mA span

Measurement Spotlight illuminates hard to see wires in dark enclosures

Detachable clamp with extension cable for measurements in tight locations

Measure 10 to 50 mA signals in older control systems using the 99.9 mA range

Automatically change the 4 to 20 mA output for remote testing

Power saving features, auto-off, backlight timeout extend battery life

Hold function captures and displays changing measurements

Applications

Air Conditioner Systems

Clean Rooms

Fume Exhaust Systems

Dwyer A3000-0 0-.50" w.c.

Switch Specifications

Switch Type:Each set point has 2 Form C relays (DPDT)

Repeatability: 1% of FS

Electrical Rating:10 A at 28 VDC 10 A at 120 240 VAC

Electrical Connections:Screw terminals. Use 167 F (75 C) copper conductors only

Power Requirements:120 VAC, 50/60 Hz 240 VAC and 24 VAC power optional

Mounting Orientation:Diaphragm in vertical position. Consult factory for other position orientations

Set Point Adjustment:Adjustable knobs on face

Agency Approvals :CE,CSA,UL

Gauge Specifications

Service:Air and non-combustible,compatible gases

Accuracy:2% of FS at 70 F (21.1 C)3% on -04% 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 48.9C)-20 to 120 F (-28 to 48.9C) with low temperature option

Process Connections :  female NPT

Dimensions :4" (101.6 mm) dial face 5 x 8 " (127 x 209.55 mm)

Weight :4 lb (1.81 kg)

High-Accuracy Pressure Monitoring

Engineered to measure pressures as low as 0-.50" w.c., the Dwyer Series A3000-0 offers accuracy within 2% of full scale at 70F. Constructed with a resilient metal alloy and equipped with an aluminum pointer, it ensures repeatable performance even in demanding environments. The instrument is suitable for air and compatible non-combustible gases, making it a preferred choice for critical monitoring applications.


Robust Build and Flexible Usage

This pressure switch features a 4" plastic dial face housed in a metal alloy case available in matte, polished, galvanized, or antique finishes. Weighing just 4 lbs, it is lightweight yet sturdy. The panel-mount design facilitates straightforward installation in control panels and enclosures, making it an excellent solution for safe and effective pressure management in diverse settings.