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Dwyer Photohelic Series A3000 Pressure Switch/Gauge, Range 2-0-2"WC


On Sale Now! Free Shipping Included! Save 5% on the Dwyer Photohelic Series A3000 Pressure Switch/Gauge, Range 2-0-2''WC by Dwyer at Buditech. MPN: A3304. Hurry! Limited time offer. Offer valid only while supplies last. Photohelic Switch/Gages function as versatile, highly repeatable pressure switches combined with a precise pressure gage employing the time-proven


Product Description

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) WC 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.

Features & Highlights

  • Bezel and front cover (with set point knobs and zero adjustment screw) removed to expose Photohelic® switch/gage set point mechanism. Cover is clear polycarbonate plastic
  • Gage pointer and light shutter are mounted on helix and balancing counterweight. Shutter passes through slot in optical limit switch to expose phototransistors to integral infrared light source or mask them depending on applied pressure
  • Light shield effectively protects phototransistors from strong outside light sources yet allows free pointer movement. It also gives interior a clean "finished" look
  • Optical limit switches are used for reliability and long service life. Attached directly to set pointers, they are individually aligned to assure precise switching accuracy
  • Zero adjustment screw connects to screw in cover to adjust zero pressure reading

Additional Information

Manufacturer:Dwyer Instruments
Brand:Dwyer
Model:A3304
Part Number:A3304
Publisher:Dwyer Instruments
Studio:Dwyer Instruments
MPN:A3304
Item Weight:4 pounds
Package Weight:4.45 pounds
Package Size:6.6 x 5.8 x 5.8 inches

Dwyer Photohelic Series A3000 Pressure Switch/Gauge, Range 2-0-2''WC by Dwyer

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Dwyer Photohelic Series A3000 Pressure Switch/Gauge, Range 2-0-2"WC

Brand: Dwyer
4.7 out of 5 stars with 48 reviews
Condition: New
Lead Time: 1 - 2 Business Days
Availability: In Stock
$319.00
$305.35
You Save: 4%


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