Comparison of Manual and Automated Pressure Calibration Methods of Medical Pressure Calibrator

In this study, manual calibration method of medical pressure calibrator is compared against automated one. Comprehensive calibration method in the Euramet cg-17 guide is followed for both manual and automated calibrations. Normalized error value (En) is used to compare equivalence of methods. En values show that manual and automated pressure calibrations are equivalent to each other. However, uncertainty values obtained at automated calibration are lower than ones obtained at manual calibration. Reasons for higher uncertainty in manual calibration are higher repeatability and higher zero deviation values. Hysteresis values are comparable to each other. In addition, two different digital manometers having different measurement principles were used as reference instruments in order to exhibit the effect of changing atmospheric pressure on gauge pressure measurements. Calibration results showed that it is necessary to take into consideration atmospheric pressure changes at gauge pressure calibrations for lower uncertainty.