EP-8000-4 Johnson Controls ELECTRO Pneumatic Transducer

Datasheet The Johnson Controls EP-8000-4 ELECTRO Pneumatic Transducer 4/20MILLI-A H; HI-VOL EP-8000 Series Electro-Pneumatic Transducers convert a voltage or current signal from an electronic controller into a pneumatic output pressure signal. An increase or decrease in the input signal proportionally increases or decreases (respectively) the output pressure signal from the EP-8000. Four models are available, which are grouped into two basic versions: low-volume output units (non-relay) and high-volume output units (relay). Overview: The EP-8000 is designed to output a proportional pneumatic control signal in response to an electronic control signal. All units feature barbed air connections for 5/32 or 1/4 inch O.D. polytubing. Sequencing of pneumatic valve or damper actuators can be accomplished using a Johnson Controls V-9502 (Valve) or D-9502 (Damper) Actuator Positioner. Operation: A change in the electrical input signal modulates the amount of air that exhausts from the leakport, producing an output pressure directly proportional to the input signal. Input and output pressure and flow relationships are detailed in Figures 3 through 5. A potentiometer located next to the wiring terminal block is provided for field span adjustment, and a screw located on the side of the EP-8000 is provided for zero adjustment. (See Figure 2 for adjustment locations.) The low-volume models are 1-pipe instruments, which require a 0.007 inch restrictor (R-3710 Series, ordered separately) in the supply air line.