Dwyer A3000 Photohelic Pressure Switch

Name: Dwyer A3000 Photohelic Pressure Switch
Availability: BackOrder

Versatile, highly repeatable pressure switches combined with a precise pressure gauge.

Select options for pricing

View Company Reviews

Manufactured

By Dwyer Instruments

Includes

FREE Ground Shipping on orders of $1,000 or more
FREE Lifetime Tech Support

Availability

Call for availability

Product Manual Product Specs

Features

3-in-1 Indicating Gauge, Lo-Limit and Hi-Limit Control
For use with air and non-combustible gases
Ranges: to 150 inH2O, 30 psi, 8 kPa, 80 mmH2O, or 80 cmH2O. Some bidirectional ranges available
Accuracy: up to ±2% of FS at 70°F
1/8" female NPT process connection
Zero adjustment screw
4" dial face
Pressure Switches: 2 Form C relays (DPDT) for each setpoint
Set Point Adjustment: Adjustable knobs on face
Repeatability: ±1% of FS
CE, CSA, UL approved. Optional-EXPL explosion-proof enclosure does not possess any agency approvals

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

The A3000 measures and controls positive, negative or differential pressures of air and compatible gases. The A3000 can be ordered in ranges up to 150 inH2O, 30 psi, 8 kPa, 80 mmH2O, or 80 cmH2O and are accurate up to ±2% of FS at 70°F. Some bidirectional ranges are also available.

The Dwyer A3000 includes two phototransistor actuated, DPDT relays for low/high limit control. Easy to adjust set point indicators are controlled by knobs located on the gauge face. In typical applications, these Dwyer switch/gauges 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.

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.