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3 In 1 Indicating Pressure Switch / Gage – A3000 Photohelic Series

3 In 1 Indicating Pressure Switch / Gage – 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/Gages functions 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. Choose from full scale pressure ranges from a low 0-.25 in (0-6 mm) w.c. up to 30 psi (21 bar).

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

Additional information

Weight N/A

Dwyer Instruments

Item Type

Gage / Switch – Dial

Mounting Style

Diaphragm in vertical position

Range in w.c.

0 to .50", 0 to 20", 0 to 5.0", 0 to 50"




within 2%, within 3%

Pressure Rating

-20" Hg. to 25 psig

Temperature Rating

20 to 120F

Process Connections

1/8" FNPT Brass Ports


4" (101.6 mm) dial face

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