Systech Instruments EC900 series Operator's Instruction Manual page 26

EC900 Series Operation Manual
V4.7
The instrument will only tolerate a certain level of adjustment. If the analyzer reads 4.9ppm and the
certified bottle is 12.6ppm, the analyzer will reject the input of a value of 12.6ppm because it
considers the error to be too large. Something else is almost certain to be incorrect. Ensure the
sample from the bottle is at equilibrium and there are no leaks in the connection from the certified gas
cylinder to the instrument. It will take many minutes, even hours, to sweep all the air out of the
pressure regulator and sample lines connected to a cylinder of a few ppm oxygen.
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