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
Systems and method for automatic color plane misregistration calibration
Lithographic apparatus and device manufacturing method
Electric motor
Output device, source apparatus, television set, system, output method, program, and recording medium
Charged particle source with multiple selectable particle emitters
Check weigher comprising of a rotating weighing chute with an accumulating and a discharge position that calculates flow rate by measuring weight accumulated during a predetermined time interv
Method of controlling semiconductor device, signal processing method, semiconductor device, and electronic apparatus
  Randomly Featured Patents
Determination of carbon in a fly ash sample through comparison to a reference microwave attenuation and phase shift
Data link layer tunneling technique for high-speed data in a noisy wireless environment
Adjustment apparatus for magnetic head device
Method of making bread products without shortenings and/or oils
Packaged cooked meat and low pH sauce
Computer multiple operation system switching method
Audio or image processing system
Apparatus for applying additional momentum
Multipolar, multi-lumen, virtual-electrode catheter with at least one surface electrode and method for ablation