Description EP-321 accepts a tristate input and provides an output pressure pulse train with a field adjustable pulse width and interval. As a result, any triac or contact closure can be converted into a desired actuator travel. By adjusting the pulse width and interval, the actuator travel time can be field programmed from as low as five seconds to 25 seconds based on system volume. The EP-321 can operate over 0–20 psig pressure range and has negligible input/output differential. The EP-321 has quiet low wattage poppet valves, rugged aluminum manifold, brass barb fittings and unique steel chassis which substantially reduces the overall size. A precision gauge is provided for the branch line pressure. The above features and a liberal five year warranty make the EP-321 the highest performance and most reliable transducer in the industry.