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Refrigerant monitoring apparatus and method

  • US 6,293,114 B1
  • Filed: 05/31/2000
  • Issued: 09/25/2001
  • Est. Priority Date: 05/31/2000
  • Status: Expired due to Term
First Claim
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1. Apparatus for monitoring a refrigerant state in a refrigeration system having an evaporator with an outlet, comprising:

  • a charge sensor positioned adjacent to the outlet of the evaporator; and

    a controller electrically connected to said sensor to provide an input signal thereto;

    said controller applying, as said input signal, an at least substantially constant voltage to a voltage divider circuit to drive said sensor;

    said sensor producing a voltage output signal in response to said input signal; and

    said controller receiving said output signal, processing said output signal, and comparing said output signal to a predetermined set point chosen to correspond to a predetermined refrigerant state.

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