Resources Contact Us Home
Variable power control for process control instruments

Image Number 8 for United States Patent #6686831.

A process control instrument includes a sensor/actuator portion and a transmitter portion connected to the sensor/actuator portion. The transmitter portion is operable to communicate with other process variable transmitters through a communication network. The transmitter includes a processing module and a power module operable to generate a power output supplied to at least the transmitter portion, wherein the power module is operable to adjust the power output based on a power control signal. Moreover, the power control signal may be generated by a controller device remote from the process control instrument and communicated to the process control instrument over the communication network. Additionally, the power module includes a power control module for adjusting the power output. This power control module includes an amplitude limiter operable to limit a power input to the process control instrument according to a controllable amplitude limit, and a power rate of change unit operable to limit a rate of change of the power input to the process control instrument according to a controllable adjustment rate limit.

  Recently Added Patents
Satellite communication network
Handover signaling in wireless networks
Horizontal aggregations in a relational database management system
Distributive data capture
Electrophotographic photoreceptor and image forming apparatus including the same
Television apparatus
  Randomly Featured Patents
Method and device for manufacturing integrally bladed rotors
Wide band cryogenic ultra-high vacuum microwave absorber
IL-1 binding proteins
Beverage tumbler
Charge pump with efficient switching techniques
Portion of a speaker
Method of making sagfets on buffer layers
Combined seat and knee rest support arm for a chair
Photographic material comprising protective layer and preparing method thereof