Device for converting pneumatic or hydraulic pressure into an electric current and vice versa

In a device for converting one signal into another signal according to a compensation principle, with a pressure transducer with a pressure-dependent moveable element, an electromagnetic force transducer, a moveable part of the force transducer standing in connection with the element, and a position indicator transmitter which converts the movement of the pressure transducer into a control signal for one of the transducers, the improvement wherein

• the pressure transducer comprises two bellows with slightly different operative surfaces respectively, each of said surfaces being fixed on one end thereof, and the other ends of said operative surfaces being connected with one another and with the moveable element, and
• said surfaces being subjected to the same pressure,
• a lever rotatably mounted at a fulcrum,
• said moveable element and the moveable part of the force transducer engage said lever at different positions of said lever and said position indicator transmitter has a moveable part, the latter engages said lever at another position of said lever remote from said fulcrum,
• a spring operatively engages said lever at still another remote position from said fulcrum,
• said lever has two arms, a single of said arms respectively being on each side of said fulcrum,
• the moveable element, the moveable part of the force transducer, and said moveable part of said position indicator transmitter engage on one of said arms of said lever, and
• a counterweight is disposed on the other of said arms of said lever.

In a device for converting a pneumatic or hydraulic pressure into an electrical current according to a compensation principle, with a pressure transducer with a pressure-dependent moveable element, an electromagnetic force transducer, a moveable part of the force transducer standing in connection with the element, and a position indicator transmitter which converts the movement of the pressure transducer into a control signal for one of the transducers, the improvement wherein

• the pressure transducer comprises two bellows with slightly different operative surfaces respectively, each of said surfaces being fixed on one end thereof, and the other ends of said operative surfaces being connected with one another and with the moveable element, and
• said surfaces being subjected to the same pressure,
• a lever rotatably mounted at a fulcrum,
• said moveable element and the moveable part of the force transducer engage said lever at different positions of said lever and said position indicator transmitter has a moveable part,
• said position indicator transmitter has a stationary coil, said moveable part of said position indicator transmitter engages said lever and is a plunger-type armature moveably disposed coaxially inside of said coil and operatively cooperating therewith.

In a device for converting one signal into another signal according to a compensation principle, with a pressure transducer with a pressure-dependent moveable element, an electromagnetic force transducer, a moveable part of the force transducer standing in connection with the element, and a position indicator transmitter which converts the movement of the pressure transducer into a control signal for one of the transducers, the improvement wherein

• the pressure transducer comprises two bellows with slightly different operative surfaces respectively, each of said surfaces being fixed on one end thereof, and the other ends of said operative surfaces being connected with one another and with the moveable element, and
• said surfaces being subjected to the same pressure,
• a lever rotatably mounted at a fulcrum,
• said moveable element and the moveable part of the force transducer engage said lever at different positions of said lever,
• said position indicator transmitter has a nozzle and a portion of said lever is adjacent said nozzle and constitutes a baffle plate cooperating with said nozzle, said portion of said lever is located at another position of said lever remote from said fulcrum.