Rob K wrote:So it does adjust automatically according to room humidity? That might explain why I don't have to adjust it too often. Sounds like I need to read the manual again.lol
Yeah and a little bit of reading that isn't covered in the manual very well I don't think. It's been a long time since I have seen that manual.
https://www.cpap.com/productpage/pr-syst ... ifier.html
This humidifier offers three levels of humidification (70, 80 or 90 percent) and the heated tube has five levels of temperature available, ranging from 4 to 16 degrees above the room temperature. These two features work together to deliver the optimum humidification level at the mask.
Here's how it works with the heated hose attached on a PR S1 machine.
You get to choose from 3 humidity levels...1 is 70%, 2 is 80% and 3 is 90%.
Let's say you choose the setting of 2.
The machine has a humidity sensor in it for the ambient room humidity...
Say the ambient room humidity is 50%...the machine will add heat to the water chamber to put out added moisture until the humidity delivered to your nose is 80%. I think there must be a humidity sensor in the hose somewhere.
It will try to maintain that 80% by varying the temp to the water chamber...more heat more moisture goes into the air.
So some nights if the ambient humidity is already fairly high the machine may not use much water because it doesn't need to add much moisture and on some nights if the ambient humidity is much lower it may use more water trying to maintain that 80 %.
The temperature part of the heated hose...that's totally independent...choose whatever feels good to you.
Please note...with the heated hose attached you have to go into the clinical setup menu area to change the humidity from 1 through 3. If you aren't in the clinical setup area and you turn that knob for humidity...all it is doing is changing the hose temp.
If all you have been doing is turning the knob thinking you were changing the humidity and you didn't go into the clinical setup menu area...all you were doing was playing with the hose air temp.
I use a heated hose...I love it...the humidity that I finally decided on is constant and consistently delivered to me.
I don't have to worry about the ambient humidity and trying to figure will I need more or less.
All I do is change the hose air temp to suit my needs...warmer for winter and cooler for summer and the humidity my nose gets never changes.
Also note that the heated hose air temp on this machine starts with ambient room temp. You can't make it colder than the ambient room temp. There's no coolant in there.
The setting of 1 adds 4 degrees to the ambient room temp so that's what ends up in the hose....and it gets warmer the more you turn it.