Important Notice: Our web hosting provider recently started charging us for additional visits, which was unexpected. In response, we're seeking donations. Depending on the situation, we may explore different monetization options for our Community and Expert Contributors. It's crucial to provide more returns for their expertise and offer more Expert Validated Answers or AI Validated Answers. Learn more about our hosting issue here.

I found that after calibrating the company’s trace oxygen analyzer on air (209,000 ppm O2), the accuracy of the readings at 75 ppm were way off. Why is this?

April 26, 2017air analyzer calibrating COMPANY O2 oxygen trace

0

Posted

I found that after calibrating the company’s trace oxygen analyzer on air (209,000 ppm O2), the accuracy of the readings at 75 ppm were way off. Why is this?

1 Answer

0

Posted

Though checking a trace oxygen analyzer’s calibration on air may seem expedient, good calibration techniques suggest using a calibration gas with an oxygen concentration within the range of the analyzer. Calibrating on 209,000 ppm of oxygen and then expecting high precision readings at concentrations < 1,000 ppm is precarious.