Dwyer Series AT-A3000 flameproof pressure switch and gauge

The Dwyer Series AT-A3000 is an ATEX/IECEx approved and flameproof Photohelic pressure switch and gauge that employs the Magnehelic gauge design.

The Photohelic switch/gauge measures and controls positive, negative or differential pressures of air and compatible gases. Two phototransistor actuated, DPDT relays are included for low/high limit control.

Easy-to-adjust setpoint indicators are controlled by knobs located on the gauge face, accessible by opening the case after de-energising the instrument. Setpoints can be interlocked to provide a variable dead band, which is suitable for the control of fans, dampers, etc.

The gauge reading is continuous and unaffected by switch operation, even during loss of electrical power. Flameproof enclosures are available in aluminium with a glass window that allows for viewing of setpoint needles and process pressure.