A sensor calibration system includes a first gas concentration sensor that measures a thermal conductivity of a target gas, a second gas concentration sensor that measures the thermal conductivity of the target gas, and a calibration circuit. The first gas concentration sensor includes a first measurement chamber. The second gas concentration sensor includes a second measurement chamber. The calibration circuit is configured to, while the first measurement chamber contains a measurement gas, a pressure inside the first measurement chamber is varied, and a temperature inside the first measurement chamber is fixed, acquire a first plurality of measurements from the first gas concentration sensor. The calibration circuit is configured to, while the second measurement chamber contains the measurement gas, a pressure inside the second measurement chamber is varied, and a temperature inside the second measurement chamber is fixed, acquire a second plurality of measurements from the second gas concentration sensor.