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Low power radar level instrument with enhanced diagnostics

  • US 6,295,018 B1
  • Filed: 09/27/1999
  • Issued: 09/25/2001
  • Est. Priority Date: 09/27/1999
  • Status: Expired due to Term
First Claim
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1. A low power radar level instrument with enhanced diagnostics, the instrument comprising:

  • a probe having a reference impedance discontinuity and extendable into a process product through a process product interface;

    a transceiver coupled to the probe, the transceiver adapted to generate a microwave transmit pulse which is transmitted along the probe into the process product, a first portion of the transmit pulse being reflected at the reference impedance discontinuity and forming a first reflected wave pulse, and a second portion of the transmit pulse being reflected at the product interface and forming a second reflected wave pulse, wherein the transceiver is also adapted to receive the reflected first and second portions; and

    a processor coupled to the transceiver and adapted to provide a diagnostic signal as a function of amplitude of the reflected first portion, and adapted to provide a level output indicative of process product height based upon time of detection of the reflected second portion.

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