Method of calibrating temperature compensated sensors

A method of calibrating an individual sensor of a particular sensor type whose output varies non-linearly with at least one measured quantity and at least one operating condition, comprises producing a set of calibration curves for each of a number of sample sensors of the particular sensor type, each curve showing the variation of the sample sensor output with the at least one measured quantity at a different value of the operating condition for the particular sensor type of said individual sensor, said set of curves covering the required operating range for the particular sensor type. The resulting sets of calibration curves of the plurality of sensors derived are then averages and the results used to produce a generic calibration surface for the particular sensor type showing the variation of the sensor reading with the at least one measured quantity across the required operating range. Individual calibration measurements are then taken for a number of different values of the measured quantity for the individual sensor at just a small number of discrete values for the at least one operating condition which fall within the full range of operating values for the at least one operating condition for which the sensor is to be calibrated. The individual calibration readings are then used to map the generic calibration surface to the individual calibration measurements of the individual sensor in order to fit it to the individual senor.