Principle of Operation
June 2017
Instruction Manual
D103176X012
56
D The I/P converter assembly is connected to supply pressure and converts the drive signal into a pressure signal. The
I/P converter is the pre-amplifier stage in the two-stage positioner design. This component enables high static gain
for responsiveness to small changes in the input signal.
D The I/P output is sent to the pneumatic relay assembly. The relay is also connected to supply pressure and amplifies
the small pressure signal from the I/P converter into a larger pneumatic output signal used by the actuator. The
pneumatic relay is the power amplifier stage in the two-stage positioner design. This component enables superior
dynamic performance with minimal steady-state air consumption.
D A sensor on the printed wiring board measures the motion of the small valve inside the pneumatic relay. This
measurement is used for minor loop feedback to the control algorithm resulting in stable, robust tuning.
D The change in relay output pressure to the actuator causes the valve to move.
D Valve position is sensed through the non-contact, linkage-less feedback sensor. There are no moving linkages and
the DVC2000 is physically separated from the valve stem through the use of a magnetic Hall effect sensor. A
magnetic array is mounted to the valve stem and the sensor is embedded in the DVC2000 housing. The sensor is
electrically connected to the printed wiring board to provide a travel feedback signal used in the control algorithm.
The valve continues to move until the correct position is attained.
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