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Use the nut driver to loosen the flow regulator nut. With gas flowing, turn counterclockwise to allow more flow and clockwise to allow less.
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Use the nut driver to lock the flow regulator once the flow meter reads 0.5 L/min or 2 L/min based on which analyzer type you are calibrating.
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Check the flow again after tightening the lock nut.
- Note: This is a one-time adjustment. Once the flow has been adjusted properly, all ports should maintain the proper flow. Report an issue if you ever adjust the flow.
Note: When performing manual calibrations using a regulator with a calibration tee, the pressure will need to be adjusted once the regulator is installed on the cylinder to set the flow for the analyzer type being calibrated—0.5 L/min or greater for phx42s and 2 L/min or greater for phx21s. This should be verified each time calibrations are being performed.