The SPD/H intelligent electric pneumatic valve positioner is a self-developed intelligent instrument product. It is based on microprocessor technology, which enables the product to have functions such as automatic tuning, self diagnosis, display alarm, etc; In the pneumatic amplification system, piezoelectric technology is also used, which completely overcomes the drawbacks of the traditional nozzle baffle structure, improves the anti vibration ability, and saves the consumption of gas source; This product can not only be used with various types of actuators, but also eliminates the need for accessories such as travel switches and valve position transmitters. Therefore, it is a new generation valve positioner that fully meets the intelligent instrument requirements of fieldbus control systems.

The main functions of the SPD/H intelligent electric pneumatic valve positioner are:
1. Automatic tuning
2. Fault alarm function
3. 4-20mA.DC valve position signal feedback function
4. Output characteristic correction function
5. On site configuration function
6. Information management function
7. Support HART protocol communication