Azbil Corporation

Yousuke Inagaki

Kouichirou Murata

Hiroaki Nagoya

A positioner is provided with a control calculating portionincluding first and second calculating portions. The first calculating portion, a valve opening detecting portion, and a first pressure sensor are contained in a first case. The second calculating portion, an electropneumatic converting portion, a pneumatic circuit portion, and a second pressure sensor are contained in a second case. The first case is assembled together with the valve, and the second case is located in a position away from the valve. Output signals from the first calculating portion, which are a control signal MV (a PWM signal) and a detected pressure signal S(wherein a detected pressure signal Shas been converted into a digital signal, are sent to the second calculating portion through cables

Positioner

In a positioner, a control calculating portion and a valve opening detecting portion are contained within a first case, and an electropneumatic converting portion and a pneumatic circuit portion are contained within a second case. The first case, which contains the control calculating portion and the valve opening detector, is assembled together with the valve, and the second case, which contains the electropneumatic converting portion and the pneumatic circuit portion, is located in a position away from the valve. A control signal MV, which is a PWM signal (a digital signal), is sent through a cable from the control calculating portion to the electropneumatic converting portion.

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Tokyo, Japan

Yousuke Inagaki