Multiple calibration ranges stored in a process transmitter

A process variable transmitter comprising:

• a process variable sensor;
• a processing unit, adapted to receive a value corresponding to a signal received from the process variable sensor, the processing unit including output value computation stages for rendering a calibrated output value based upon the received value including:
• a characterization computation stage, and
• a calibration computation stage;
• and
• a calibration memory comprising multiple calibration correction definition entries expressing a correction relation for generating calibration corrections for multiple calibrated ranges within a full operating range of the process variable transmitter;
• wherein a calibration correction definition entry corresponds to a pair of calibration points delimiting one of the multiple calibrated ranges and corresponds to a sensor vicinity temperature at which calibration information was obtained for the calibration correction definition entry.

A process variable transmitter comprising:

• a process variable sensor;
• a processing unit, adapted to receive a value corresponding to a signal received from the process variable sensor, the processing unit including output value computation stages for rendering a calibrated output value based upon the received value including:
• a characterization computation stage, and
• a calibration computation stage;
• and
• a calibration memory comprising multiple calibration correction definition entries expressing a correction relation for generating calibration corrections for multiple calibrated ranges within a full operating range of the process variable transmitter;
• wherein a set of calibration relations are specified for a series of adjacent ranges, and wherein calibration values are generated such that calibrated output values are equal at boundaries between adjacent calibrated ranges.

A process variable transmitter comprising:

• a process variable sensor;
• a processing unit, adapted to receive a value corresponding to a signal received from the process variable sensor, the processing unit including output value computation stages for rendering a calibrated output value based upon the received value including:
• a characterization computation stage, and
• a calibration computation stage;
• and
• a calibration memory comprising multiple calibration correction definition entries expressing a correction relation for generating calibration corrections for multiple calibrated ranges within a full operating range of the process variable transmitter;
• wherein the calibration memory comprises a first calibration table comprising a default set of calibration correction definition entries and a second calibration table comprising a user-specified set of calibration correction definition entries.

A method of enabling a process variable transmitter to apply calibration-based corrections to calculated sensor measurements in the process variable transmitter including a non-volatile memory configured to store multiple calibration-based correction definitions corresponding to sub-ranges within a full operating range of the process variable transmitter, the method comprising for each of at least two calibrated ranges the following:

• taking sensor readings for at least two known process variable inputs corresponding to a calibrated range;
• generating, for the two known process variable inputs, digital non-calibrated sensor reading values;
• applying values of the two known process variable inputs to the non-calibrated sensor reading values to render a calibration correction definition;
• and
• storing the calibration correction definition in an entry, of a calibration memory structure supporting simultaneously storing multiple calibration correction definitions associated with particular calibrated ranges, corresponding to the calibrated range within the non-volatile memory;
• wherein the calibration correction definition corresponds to a pair of calibration points for a calibrated range, the calibration definition comprises a linear correction equation, and wherein the applying step comprises:
• determining a calibration offset and a calibration slope for the calibration correction definition.

A method of enabling a process variable transmitter to apply calibration-based corrections to calculated sensor measurements in the process variable transmitter including a non-volatile memory configured to store multiple calibration-based correction definitions corresponding to sub-ranges within a full operating range of the process variable transmitter, the method comprising for each of at least two calibrated ranges the following:

• taking sensor readings for at least two known process variable inputs corresponding to a calibrated range;
• generating, for the two known process variable inputs, digital non-calibrated sensor reading values;
• applying values of the two known process variable inputs to the non-calibrated sensor reading values to render a calibration correction definition;
• and
• storing the calibration correction definition in an entry, of a calibration memory structure supporting simultaneously storing multiple calibration correction definitions associated with particular calibrated ranges, corresponding to the calibrated range within the non-volatile memory;
• wherein the calibration correction definition corresponds to a pair of calibration points for a calibrated range and the calibration correction definition further corresponds to a sensor vicinity temperature at which calibration information was obtained for the calibration correction definition.

A method of enabling a process variable transmitter to apply calibration-based corrections to calculated sensor measurements in the process variable transmitter including a non-volatile memory configured to store multiple calibration-based correction definitions corresponding to sub-ranges within a full operating range of the process variable transmitter, the method comprising for each of at least two calibrated ranges the following:

• taking sensor readings for at least two known process variable inputs corresponding to a calibrated range;
• generating, for the two known process variable inputs, digital non-calibrated sensor reading values;
• applying values of the two known process variable inputs to the non-calibrated sensor reading values to render a calibration correction definition;
• and
• storing the calibration correction definition in an entry, of a calibration memory structure supporting simultaneously storing multiple calibration correction definitions associated with particular calibrated ranges, corresponding to the calibrated range within the non-volatile memory;
• wherein the at least two calibrated ranges comprise a series of adjacent ranges, and wherein calibration correction definition values are generated such that calibrated output values are equal at boundaries between adjacent calibrated ranges.