Electropneumatic Digital Positioner is a new generation highly efficient instrument with remote communication and diagnostics function. It provides reliable operation of control valves and features extreme ease of setup and start-up. The instrument is equipped with a unique contactless motion sensor ensuring positioning accuracy and failure-free operation. Pneumatic circuit is a two-step amplifier system. Its parts being in contact with the measured medium are made of stainless steel. This provides the system long service life. The standard design is intrinsically safe, explosion-proof and flame-proof. The model used for high-rate flow includes control valve air flow coefficient.