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

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

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

Model	Description
A3000-0	Pressure Switch/Gage, Range 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).

Photohelic Sensing - How It Works

In typical applications, these Dwyer switch/gages control between high and low pressure set points. When pressure changes, reaching either set point pressure, the infrared light to the limiting phototransistor is cut off by the helix-driven light shutter. The resulting phototransistor signal is electronically amplified to actuate its DPDT slave relay and switching occurs. Dead band between make and break is 1% of full scale or less - just enough to assure positive, chatter-free operation.

Relay-Transformer Features

A plastic housing protects all electronic components. Solid-state and integrated circuit electronics are on glass-epoxy printed circuit boards and self-extinguishing terminal boards.

Product Applications

Air Conditioner Systems

Clean Rooms

Fume Exhaust Systems 

 

Versatile Pressure Monitoring for Industrial Needs

The A3000-0 Photohelic Pressure Switch Gage is engineered for versatility, allowing accurate differential air and compatible gas pressure measurements. Its ability to control two independent process set points makes it suitable for a variety of industrial environments, including HVAC systems and clean room pressure management. Its flush and surface mount options provide flexibility for installation across diverse settings.


Sturdy Design with Swift, Reliable Response

Housed in a durable die-cast aluminum case with a polycarbonate/acrylic window, the gauge delivers consistent performance in demanding conditions. The IP54-rated front grants dust and splash resistance. Instantaneous mechanical response enables rapid actuation of control systems, contributing to more effective and responsive operations in pressure-critical applications.