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Static and dynamic characteristics of rapid response pneumatic digital systems are determined with the help of pneumatic-galvanometric sensors that consist of pneumatic optical converters, electrical bridge circuits and magnetoelectric galvanometers. This paper presents theoretical and experimental studies of the pneumatic optical converter whose mode of operation is based on the jet force effect on a plate of limited dimensions commensurate with the dimensions of the contact area between the jet and the plate. The investigations are based on the equality of moments of the jet force and the counter-moment of the rod that the plate is fixed on. The sensitivity and other static characteristics of the converter (linearity, measurement rage) as well as other parameters necessary for interpreting the readings, calculating errors and calibrating the scale are determined. The natural frequency is sufficient to control dynamic processes controlled by pneumatic systems. For the design of converters, it is proposed to use the aggregate criterion of the quality factor that equals the product of the sensitivity and the natural frequency squared. The performed calculations are verified by experiments.