TZIDC electro-pneumatic positioners mount to oil, gas, and petrochem process pneumatic valves. For 4 to 20 mA control systems, they come in four different versions: single-acting and double-acting, each with a 'fail-safe' or 'fail-freeze' function. TZIDC automatically adapts its control settings to such final control elements as valves. An I/P module within the positioner adjusts a 3/3 valve that regulates air flow to pressurize/depressurize the actuator to maintain position.

ABB Instrumentation, Warminster, PA, USA

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