+91-22-25126500 :: Pressure,Differential Pressure,Temperature,Level,Flow,Process Control,valves,Test Equipments

Series A3000 Photohelic® Pressure Switch/Gage

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


” I would like to put on record my appreciation of the service you provide. Your prompt delivery/collection service is very useful as it minimizes equipment downtime. I have always found the work carried out to be of the highest quality. The calibration paperwork received is always clear and concise. In short it has made our compliance with quality standards easier. I would recommend your calibration service to anyone.”
“ PERFECT is the most suitable word to describe their service “

“I did the Right Choice ,cost effective,Great Service”

Slide background
Slide background
Slide background
Slide background
Dwyer Differential Pressure, Dwyer Air/Inert Gases, Dwyer Differential Pressure Gages, Dwyer Dial Gauges For Air/Inert Gases, Dwyer Controllers For Air/Inert Gases, Dwyer Data Loggers, Dwyer Switches For Air/Inert Gases, Dwyer Manometers, Dwyer Transmitters For Air/Inert Gases, Dwyer Wet/Wet Differential Pressure, Dwyer Wet/Wet Transmitters, Dwyer Wet/Wet Controllers, Dwyer Wet/Wet Dial Gauges, Dwyer Wet/Wet Switches, Dwyer Gauge/Absolute/Vacuum, Dwyer Pressure Gauges, Dwyer Digital Pressure Gauges, Dwyer Pressure Transmitters, Dwyer Pressure Switches, Dwyer Pressure Controllers, Dwyer Pressure Data Loggers, Dwyer Air QualityDwyer Air Velocity & Flow, Dwyer Air Velocity & Flow Switches, Dwyer Air Velocity & Flow Transmitters, Dwyer Air Velocity & Flow Sensors, Dwyer CO & CO2 Transmitters, Dwyer Temperature & Humidity, Dwyer Temperature & Humidity Switches, Dwyer Temperature & Humidity Transmitters, Dwyer Flow, Dwyer Flow Gauges, Dwyer Flowmeters, Dwyer Flow Sensors Dwyer Sight Flow Indicators, Dwyer Flow Switches, Dwyer Flow Transmitters, Dwyer Rotameters, Dwyer Temperature, Dwyer Temperature Controllers, Dwyer Temperature Data Loggers, Dwyer Temperature Dial Gauges, Dwyer Temperature Digital Thermometer or Indicator, Dwyer Temperature Sensors, Dwyer Temperature Switches, Dwyer Temperature Thermometers, Dwyer Temperature Thermowell, Dwyer Temperature Transmitters, Dwyer Level, Dwyer Level Controller, Dwyer Level Data Loggers, Dwyer Level Indicator, Dwyer Level Switches, Dwyer Level Transmitters, Dwyer Adjustable Differential Pressure SwitchesDwyer Vacuum Switches, Dwyer Vibration Switches, Dwyer Differential Pressure Controllers, Dwyer CO & CO2 Transmitters, Dwyer Instruments in MumbaiAerosense in Mumbai