Thermal measuring and testing – Temperature measurement – By electrical or magnetic heat sensor
Reexamination Certificate
2006-05-23
2006-05-23
Gutierrez, Diego (Department: 2859)
Thermal measuring and testing
Temperature measurement
By electrical or magnetic heat sensor
C257S467000
Reexamination Certificate
active
07048438
ABSTRACT:
A method and system for automated temperature measurement is described. The system includes a programmable logic controller, a temperature measurement diode, an analog-to-digital converter coupled to the diode and the programmable logic controller, a current source coupled to the diode and configured to generate a first current and a second current different from said first current, and a processor coupled to the current source and to the analog-to-digital converter. The processor controls the current source such that the current source sequentially applies the first current to the diode at a first point in time and applies the second current to the diode at a second point in time. The processor also receives a first voltage across the diode measured when the first current is applied to the diode and a second voltage across the diode measured when the second current is applied to the diode. Based on the first and second voltages, the processor determines the temperature proximate the diode.
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Design Ideas—Transistor Sensor Needs No Compensation.
LM82—Remote Diode and Local Digital Temperature Sensor with Two-Wire Interface.
LM83—Triple-Diode Input and Local Digital Temperature Sensor with Two-Wire Interface.
LM84—Diode Input Digital Temperature Sensor with Two-Wire Interface.
LM34/LM35—Precision Monolithic Temperature Sensors.
Gutierrez Diego
Jagan Mirellys
Schneider Automatic Inc.
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