I'm working on my gas blender certification, and I brought a couple of [my] cylinders home for testing because they were hot.
They should have come in +/- .2 of 32.2%.
They did not. They came in low. Now, I am fairly confident in my gas analyzer, but I hadn't calibrated it to air under pressure.
So, until I get around to finding a air tank . . . or borrowing the instructors' analyzer . .
So, what range of readings would be in your comfort zone? So far, my calculations and fills have pretty much been spot on. Therefore, I am questioning the calibration of my analyzer. Do you ever question yours? How far out would the swing be before you would be concerned?
I calibrate with 99%O2 when analyzing 60% or more, and calibrate with air for 21-50%.
They should have come in +/- .2 of 32.2%.
They did not. They came in low. Now, I am fairly confident in my gas analyzer, but I hadn't calibrated it to air under pressure.
So, until I get around to finding a air tank . . . or borrowing the instructors' analyzer . .
So, what range of readings would be in your comfort zone? So far, my calculations and fills have pretty much been spot on. Therefore, I am questioning the calibration of my analyzer. Do you ever question yours? How far out would the swing be before you would be concerned?
I calibrate with 99%O2 when analyzing 60% or more, and calibrate with air for 21-50%.