Patent ID: 7975498

Claim:
An intelligent controller adapted for regulating operation of a system selected from a group consisting of a refrigeration system and an air conditioning system, the system including at least: a) a compressor; b) an electric motor that drives the compressor; c) a compressor suction line connected to an intake side of the compressor; and d) a compressor discharge line connected to a discharge outlet side of the compressor, the system further including at least one pressure sensor for producing a first output electrical signal that corresponds to pressure existing at the pressure sensor, the intelligent controller comprising: a programmable electronic circuit for receiving the first output electrical signal produced by the at least one pressure sensor and responsive thereto energizing operation of the motor thereby regulating operation of the system, the programmable electronic circuit performing a calibration operation in which the programmable electronic circuit measures the output electrical signal received from the at least one pressure sensor and stores as an offset the value so measured, the programmable electronic circuit subsequently applying the stored offset for adjusting a value of the output electrical signal received from the at least one pressure sensor during normal operation of the system.