The MAMAC Model EP-311/313 Series incorporates quiet low wattage poppet valves and a pressure sensor to measure and adjust the branch line pressure proportional to the input. This unit has no air consumption and is immune to supply line pressure fluctuations. The Model EP-313 incorporates amAnual override switch and, in themAnual mode, the pressure can be increased or decreased with two push button switches. This feature is most desirable for check out/commissioning andmAnual operation in case of controller failure. The Universal 24 VAC/24 VDC supply voltage and field-selectable 4-20mA, 0-5 VDC, or 0-10 VDC inputs ensure single unit compatibility to most of the systems. Unique steel chassis design substantially reduces the overall size of the unit and, at the same time, provides for ease of installation in a control panel directly or with a snap track. A precision gauge is provided for the branch line pressure. Rugged aluminummAnifold, brass barb fittings, floating poppet solenoid valves, silicon pressure sensor, high performance electronics and a liberal five year warranty are some of the features whichmAke the Model EP-311/313 Series the highest performing and the most reliable electropneumatic transducers in the industry.