Position controller for a drive-actuated valve having inherent safety design
AssigneeSiemens Aktiengesellschaft
InventorAndre-Heinrich Meinhof
Life of this patent
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Abstract
A position controller including a position transmitter (9) and a control unit (13). The position transmitter detects the actual position of an actuator (7). The control unit (13) is arranged in an ignition-proof enclosure that is separate from the housing of the position transmitter (9). The interface (18) between the control unit (13) and the position transmitter (9) as well as the position transmitter (9) itself—which comprises a magnet (10) and a magnetoresistive sensor (50)—have an inherent electrical safety design.
Claims9
A position controller, for a valve actuated by a drive, having an inherent safety design, comprising:
- a position transmitter that detects the actual position of an actuator, and
- a control unit that compares the actual position with a predefined desired position and that generates an actuating signal,
- wherein the position transmitter comprises a magnet and a magnetoresistive sensor, and wherein the magnet and sensor are rotatable or displaceable relative to one another in conjunction with a movement of the actuator,
- wherein the control unit is arranged in a flame-proof enclosure that is separate from a housing of the position transmitter, and
- further wherein an interface of the control unit to the position transmitter, as well as the position transmitter itself, have an inherent electrical safety design.
Dependencies are inferred from the claim text.