Gas Correction Curves for PG105
It is important to understand that the pressure indicated by a PG105 convection-enhanced Pirani gauge
depends on the type of gas. All PG105 convection-enhanced Pirani gauges are factory-calibrated and
temperature-compensated for nitrogen (air). However the response of the gauge to other gases is very well
characterized and, with the proper calibration data, it is possible to obtain accurate pressure measurements
for other gases as well.
IGC100 controllers are factory-loaded with Nitrogen and Argon specific calibration curves compatible
with all PG105 gauges, and direct pressure measurements are possible for both gases.
If you must measure the pressure of gases other than Nitrogen or Argon, use Gas Correction Curves, like
figures I-1 and I-2 included in this application note, to convert "nitrogen equivalent pressure" readings