Despite their advantages, Pirani gauges also have some limitations:
Gas Type Sensitivity: The accuracy of a Pirani gauge can be affected by the type of gas being measured, as different gases have different thermal conductivities. Calibration: Regular calibration is required to maintain accuracy, especially when measuring different gases or under varying environmental conditions. Limited to Low Pressures: Pirani gauges are not suitable for measuring very high vacuum pressures (below 10-4 mbar) or atmospheric pressures with high precision.
