Vikas Dattatraya Sawant Customers often rely on calibration gases in cylinders to verify the performance of instruments. Deciding whether the instrument passes or fails should be a simple review of uncertainty claims. In reality, deciding which depends on far more than simply comparing uncertainty tolerances stated on the cylinder or the instrument under test. One of the most difficult parameters to validate accurately is the moisture content of gases. Water's polar nature and its obvious abundance in the environment, effectively makes it sticky. This reluctance to release from surfaces gives rise to hysteresis or memory effects, that can be as large as 500%.
4 years ago