DE/3M-3 & DE/3M-3-EP
Electro-pneumatic positioner DE/3M-3-EP (fig. 2) are modular, consisting of a pneumatic positioner DE/3M-3 (fig. 1) and an electro-pneumatic transducer. The two units are assembled together. Positioner DE/3M-3-EP is based on the balanced-forces principle. it is basically composed as follows:
• an electro-pneumatic transducer operated by the electrical control signal;
• a diaphragm operated by pneumatic control signal originated by the transducer;
• a reverse feed-back spring;
• a double-acting spool valve connected to a diaphragm and spring through the stem.
Double-acting positioner DE/3M-3-EP can be converted to simple-acting positioner by plugging the connection between the positioner and the cylinder chamber on the shaft's side. Moreover it is necessary to install a system for cylinder's return.
- Accuracy (linearity, repeatability and hysteresis): ≤ 1%
- Action: direct with retracted stem at 4 mA signal
- Air supply pressure: 200 to 700 kPa
- Electrical signal: 1/2" NPTF
- Input signal: 4 to 20 mA / 3 to 15 psi
- Maximum air flow rate: 18 Nm^3/h (measured with air supply pressure of 600 kPa)
- Operating temperature: -20°C to +70°C (higher or lower temperature available on request)
- Pressure gauges: 1/8" NPTF (on signal and on two outputs)
- Sensistivity: ≤ 0,3% on the whole stroke
- Standard strokes: 125, 150 and 200 mm
- Supply, input and output signals: 1/4" NPTF
