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
Sensor chip, sensor cartridge, and analysis apparatus
Electrical conduit containing a fire-resisting thermoplastic composition
Voltage regulators with improved wake-up response
Formation of a masking layer on a dielectric region to facilitate formation of a capping layer on electrically conductive regions separated by the dielectric region
Control device with adjusting pulse width modulation function and the backlight module thereof
Wireless communication apparatus, a method of wireless communication, and a program for wireless communication
Method to prevent hyper frame number de-synchronization in a wireless communication system
  Randomly Featured Patents
Delegating authority to evaluate content
Fume hood incorporating high efficiency auxiliary air plenum
Histogram construction using adaptive random sampling with cross-validation for database systems
Car washing machine and system
Method of preventing abnormal stimulation of AT.sub.1 and AT.sub.2 receptors
Portable audio device having reduced sensitivity to RF interference and related methods
Tilting arm distractor
Method and apparatus for frequency offset correction
Powered toothbrush with rotating sections
Color cathode ray tube