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This advanced E-Pi technology uses a minimal amount of electrical energy and air consumption to convert a 4 to 20 input signal to a proportional pneumatic output signal. This pneumatic (backpressure) output is precisely modulated by a virtually weightless, low-mass membrane that is held in a continuously balanced position. The output of the E-Pi is fed into an integral volume booster to deliver a pneumatic output signal with an output capacity of 4.0 scfm. Overall performance, accuracy and repeatability are further enhanced via an internal feedback network that allows the transducer to quickly respond to input changes. These balanced supply and exhaust dynamics enhance stability while delivering accuracy of ±0.15% of span for superior process control.