Dwyer A3000 3-in-1 Pressure Switch / Gauge – A3000 Photohelic Series

Dwyer A3000 3-in-1 Pressure Switch / Gauge – A3000 Photohelic Series


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Item # A3000-DWYER Brand: Dwyer Instruments


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

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  • Description
  • Additional information


The Series A3000 Photohelic Switch/Gauges functions as versatile, highly repeatable pressure switches combined with a precise pressure gauge employing the time-proven Magnehelic gauge design. The Photohelic switch/gauge 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 gauge 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.

Gauge 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).


  • Mounting Style: Diaphragm in Vertical Position
  • Pressure Rating: -20″ Hg – 25 PSIG
  • Temp Rating: 20 – 120 F
  • Process Connections: 1/8″ FNPT Brass Ports
  • Size: 4″ (101.6 mm) dial face

Applications: Air conditioning systems; Clean Rooms; Fume Exhaust Systems.

Additional information

Weight N/A

Dwyer Instruments

Item Type

Gauge / Switch – Dial

Range in w.c.

0-0.50", 0-20", 0-5.0", 0-50"




Within 2%, Within 3%

A3000-0Range in w.c.: 0-0.50"Accuracy: Within 3%
A3005Range in w.c.: 0-5.0"Accuracy: Within 2%
A3020Range in w.c.: 0-20"Accuracy: Within 2%
A3050Range in w.c.: 0-50"Accuracy: Within 2%
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