test to know if my oxycon is working correctly?

[funky gems]

Is there a way to test my oxycon to ensure that it is working as it should be?
Thanks,
Wendy

[kbinkster]

Do you suspect that it is not working correctly? I have an analyzer that is used to check the function of oxygen concentrators that I rent out. It measures the outlet pressure, the flow, and the purity of the oxygen.

What is going on with it?