Device identification of tube type and possible assumed expiration?

[adamkld]

(I tried searching before posting but had no luck.)

Specifically asking about Philips Respironics tubes but could be asked of other brands.

CPAP devices are able to recognize the various heated tube types and in some cases refuse to work with "incompatible" types (in my case DS1 refusing to work with HT12 from DS2) and I'm wondering two things.

• How do they recognize the difference?  Is there a chip or is it a simple electrical characteristic such as resistance?
  
• Do any devices have the programming to consider tubes "expired" based on the amount of usage recorded? (This might be indicated not by refusing to work but by adjusting the result metrics.)
  

[Crimson Nape]

I can speak about a Resmed, but not Philips. Each model employs a different electrical connection interface. This will make the previous model's heated hose incompatible with all other versions. I would expect no less from Philips. . . Can you say, "Additional revenue"?
- Red

[Deborah K.]

It sounds like you are using an old machine. After five years, your DME should be able to provide you with a new machine with insurance paying most of the cost. I suggest you have your doctor prescribe you a ResMed machine. The Philips machines have been recalled and are inferior machines. When my husband and I switched to ResMeds, we could not believe how much better they are and how much better we both sleep.

If you would post an Oscar chart, we would see the type of machine you are using and whether you may need a different type.