Series A3000 Photohelic Pressure Switch/Gauge

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

The Series A3000 Photohelic® Switch/Gauges function as versatile, highly repeatable pressure switches combined with a precise pressure gage 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).