See phx21 Start-up Guide for general calibration information.
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Tap Menu.
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Tap Calibrate.
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Tap Calibrate at the bottom-left.
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Type the actual PPM for the cylinder into the PPM field. Zero will be the first gas and is already populated.
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Apply gas for 10 seconds and then tap Generate.
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Let the timer count down.
The phx21 will sample the gas, then the PPM value will be added to the list of Current Calibrations on phx21. Repeat Steps 4-6 until all the Calibration Spans have been added, then tap Done.