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Written by REM
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 Air compressors are costly to run and maintain, so any reduction of air usage will result in large financial savings in both the running cost of the compressors and maintenance reductions. The amount of compressed air that positioners consume at steady state is important. Low air consumption means the positioner is more economical from an operating standpoint with higher energy savings. In many control loops with correct PID tuning, the control actuator may move only small amounts during the control cycle and the percentage of time at the steady-state position is high. ABB Instrumentation says its TZIDC Digital Positioner provides best-in-class low air consumption at steady state (0.015 scfm) regardless of the air supply pressure.
www.abb.com/instrumentation
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