- 1 - 6th edition No. SS2-HEP180-0100 FM Explosionproof approval Electro-Pneumatic Valve Positioners Models HEP18/19, HEP28/29 HEP18/19 (Single action) HEP28/29 (Double action) OVERVIEW Mounted on control valves, HEP Electro-Pneumatic Valve Positioners model HEP18/19/28/29 control valve positions swiftly and accurately by supplying or discharging air from pneumatic actuators in response to input signals from controllers. FEATURES . Each model uses a pilot valve that features low air consumption and a high capacity. Each single-action model has a stabilizer with three patterns of holes in a pilot base. By rotation switching, it ensures highly sensitive and extremely stable operation with small- to largecapacity actuators. . The magnet is a high-precision moving coil. With a terminal box, it forms an explosion-proof structure. To check the inside, the covers of these models can be removed during operation. . The rare-earth metal magnet has excellent magnetic characteristics. The moving coil is round and energized by a flat spring. It requires no leads. . Since each model is compact and lightweight, it can be used with even a small actuator. No piping is required because the model KZ03 pressure regulator with filter can be directly attached to the positioner. China RoHS This device is used in the Oil & Gas, Petrochemical, Chemical, Pulp & Paper, Food & Beverage, Machinery, Steel/Metal & Mining, and Automobile industries and therefore does not fall under the China RoHS Legislation. If this device is used in semiconductor manufacturing equipment, labeling on the device and documents for the China RoHS may be required. If such documents are required, consult an Azbil Corp. representative. SPECIFICATIONS Models Model HEP18: FM Explosionproof approval (single action) Model HEP19: FM Intrinsically safe approval (single action) Model HEP28: FM Explosionproof approval (double action) Model HEP29: FM Intrinsically safe approval (double action) Input signals 4 to 20 mA DC, Half range (4 to 12 mA DC and 12 to 20 mA DC) Input resistance 250 ± 10 .. (4 to 20 mA DC input) Output characteristics Linear, equal-percentage, and quick-opening Air supply pressure Model HEP18/19: 140 to 490 kPa {1.4 to 5.0 kgf/cm2} Model HEP28/29: 200 to 690 kPa {2.0 to 7.0 kgf/cm2} Air consumption Model HEP18/19 4 ../min [N] (steady-state under air supply pressure 140 kPa {1.4 kgf/cm2}) 5 ../min [N] (steady-state under air supply pressure 270 kPa {2.8 kgf/cm2}) 6 ../min [N] (steady-state under air supply pressure 390 kPa {4.0 kgf/cm2}) Model HEP28/29 15 ../min [N] (steady-state under air supply pressure 490 kPa {5.0 kgf/cm2}) Air connection 1/4 NPT internal thread (standard), Rc1/4 7 8 Specifications are subject to change without notice. “This product is designed for general industrial use.”