Patent ID: 6373261
Filing Date: 2002-04-16
Classification: G01F

Abstract:
A level transmitter coupleable to a two-wire process control loop configured to carry a current between 4 mA and 20 mA, the level transmitter for measuring height of a product in a tank, comprising:a source adapted to send electromagnetic pulsed signals into the tank; a receiver adapted to receive reflected electromagnetic pulsed signals from the tank; an analog to digital converter configured to convert an output from the receiver into digital data; a digital processor configured to receive data from the analog to digital converter and adapted to determine product height based upon received reflected electromagnetic signals as a function of tank height and distance of pulse travel; a power supply including a voltage regulator adapted to provide a regulated output voltage to components of the level transmitter; and an output device coupleable to the two-wire process control loop and adapted to transmit information related to product height over the loop, the information transmitted digitally; wherein the level transmitter is adapted to receive power from the loop, wherein power from the loop is the sole source of power for all components of the level transmitter.