System and method for sensor thermal drift offset compensation

A meter comprising:

• a gauge outputting a gauge voltage;
• a temperature sensor configured to measure a temperature in the gauge;
• an analog-to-digital converter (ADC) in communication with the temperature sensor, the ADC configured to convert a temperature voltage measured by the temperature sensor to a digital signal;
• a processor in communication with the ADC, the processor configured to generate a offset signal based on the digital signal;
• a digital to analog converter (DAC) in communication with the processor, the DAC configured to convert the offset signal to a offset voltage;
• an instrumentation amplifier in communication with the gauge, the instrumentation amplifier configured to receive the gauge voltage and the offset voltage and output an amplified gauge voltage;
• and
• a second ADC in communication with the instrumentation amplifier and the processor, the second ADC configured to convert the amplified gauge voltage to a digital output, wherein the digital output is processed by the processor for output from the meter.

A method for compensating for thermal drift in a meter, the method comprising:

• measuring a temperature in a meter as a temperature voltage;
• converting the temperature voltage to a digital signal;
• generating an offset voltage in response to the digital signal, wherein the offset voltage is generated by performing polynomial conversion utilizing the digital signal;
• applying the offset voltage as an input to an amplifier, the amplifier receiving as a second input a gauge voltage to generate an amplified gauge voltage as an output;
• converting the amplified gauge voltage that has been amplified to a digital output;
• and
• processing the digital output to generate an output from the meter that corrects the gauge voltage using the offset voltage to compensate for thermal drift.