The Series A3000 Photohelic Pressure Switch/Gage 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).

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Features / Benefits:

• 3-in-1 instrument allows the reduction of several instruments with one product, saving inventory, installation time and money
• Patented design and 1% full-scale dead band provides quick response to pressure changes means no delay in switching and chatter-free operation
• A wide range of models that can meet pressure measurement specifications from low to very high

Applications:

• Air conditioning systems
• Clean rooms
• Fume exhaust systems

Resources:

• A3000 Series Catalog
• A3000 Installation Instructions