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PB 840 Oxygen Issue  

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Hey everyone!  I have a PB 840 ventilator that, when it's set to 40% O2, the oxygen on the screen reads 44-45% O2 but my external oxygen meter says the oxygen level is correct.  All other oxygen levels read within spec.  Any ideas what could cause this?  (Already tried calibrating/replacing the O2 sensor)

 
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