PB 420E question

gar729 · Post by **gar729** » Mon Dec 12, 2005 5:13 pm

Hi all, I just received my 420E from cpap.com and have set my high and low pressures. On Cpap I use a pressure 12 so I set the high @ 13 and the low @ 9. I had talked this over with my sleep Doc so all is well. What I don't understand is the pressure sensor setting. Default is 104, with a range from 0 to 255. What exactly does this sensor do, and what changes with a different setting?
Also, in Apap mode, should the pressure increase if I hold my breath? I tested it that way and nothing happened.
Thanks for any info
Gary

Guest · Post by **Guest** » Mon Dec 12, 2005 7:55 pm

Default is 104, with a range from 0 to 255.

Normally don't have to touch that setting. It's used to calibrate the machine. Say the machine is set at 10 cm but delivers too much or too little pressure. That's when this setting comes into play.

ProfessorSleep · Post by **ProfessorSleep** » Mon Dec 12, 2005 8:19 pm

Yep, guest is right - if you use a manometer to set the pressure, it might be off one way or the other. For example, manometer reads 9, but machine doesn't quite see it as 9. Adjusting the pressure sensor setting provides a degree of fine tuning for calibration. No need to do anything to that number unless you are checking the pressure with a manometer.
I can't answer the one about holding your breath - never tried it! I do know it blows like crazy if there is no resistance, for example, an open hose end. What I want to know is what else can I use to plug the pressure hose line when cleaning the hose after I lose/the cat or dog turns into a toy those cute but very teeny caps that come with the hose!

gar729 · Post by **gar729** » Mon Dec 12, 2005 9:25 pm

hey guys, thanks for the info. Many thanks!
So, thats what those little plugs are for! I thought that they might be used if using the machine in cpap mode. I bet a head phone jack with the wires clipped would work. Maybe Anyway thanks again
Gary

ozij · Post by **ozij** » Mon Dec 12, 2005 11:12 pm

Where did you people find the pressure sensor setting?

O.

John M · Post by **John M** » Tue Dec 13, 2005 10:00 am

The reason the pressure did not go up when you held your breath is because there is a 15 minute "settling in period" where the machine will not respond because it assumes you are awake.

If you want to feel the pressure increasing, you will have to let the machine run (with you wearing your mask) for a minimum of 15 minutes. Then you will need to either fake snore or hold your breath for 10 seconds or more. . .

-John

ProfessorSleep · Post by **ProfessorSleep** » Tue Dec 13, 2005 10:20 am

gar729 wrote:hey guys, thanks for the info. Many thanks!
So, thats what those little plugs are for! I thought that they might be used if using the machine in cpap mode. I bet a head phone jack with the wires clipped would work. Maybe Anyway thanks again

Great idea about the audio jacks - I bet you're right that the little ones would fit right in. Maybe I should leave the wires on, sort of like those mitten strings that go through the sleeves of kids jackets!

By all means, when you wash the hose be SURE to plug up the ends of the sensor line. Water in there will make the machine sense added resistance and throw the pressure into runaway mode. Keep the line clear. If you do get something in there, a can of compressed air can be used to clear it, or any air pressure (including blowing through it) that will not add additional condensation.

O, I've got to get out the manual for the pressure setting thing. It's one of those items in the menu when you hold down the "secret button." Good thing this group serves as decoder rings for us all!

ozij · Post by **ozij** » Tue Dec 13, 2005 12:27 pm

Well that figures - I really tried the secret combination.

O.

gar729 · Post by **gar729** » Tue Dec 13, 2005 1:02 pm

Ozij, You can access the pressure sensor by pressing the Key and info access buttons at the same time until it displays "apap" or "cpap", then press just the access button several times until you find the sensor setting. Mine is pre-set @ 104. It's the window after "compliance meter value." I wouldn't change the pressure setting without talking to my sleep Doc.
Cheers
Gary

ProfessorSleep · Post by **ProfessorSleep** » Tue Dec 13, 2005 1:39 pm

Sorry, O - but I see that while I was looking for my manual gar came up with the answer! Now where DID I put that thing...?

Guest · Post by **Guest** » Tue Dec 13, 2005 9:44 pm

Thanks, gar729 and ProfessorSleep.

I was just curious!

O.

P.S. - I had actually meant to write that I never really tried the secret menu -

ozij · Post by **ozij** » Tue Dec 13, 2005 9:50 pm

And now I got guested as well.
...Meaning: I went to the topic directly from the email notifying me of an answer.... but with autologin functioning only in my thoughts, and not in reality ---

Oh well.

O.

PB 420E question

PB 420E question

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