Operating noise difference between the 420G and 420S

bigheadr · Post by **bigheadr** » Thu Jul 07, 2005 6:29 am

I got my new 420S yesterday from the DME although I had to go back to the DME in the afternoon when I figured out that I couldn't put the 420S on my 420 H2O humidifer because I left the coupling between the two with the 420G that I exchanged. So I had to drive 20 miles to pick the coupling up. I used the 420S yesterday for a nap and then at night. I notice that the 420S was alot noisier than my old 420G. Has anyone have two 420's before and what were your noise experiences with them? I also, notice that the compliance meter isn't working on my 420S since it reads 0 even after a night sleep. Is this normal or do I have a defective 420S?

My mouth taping is working but I decided to try a Sullivan chin strap rather than taping the rest of my life. I ordered my Silverling software and the Sullivan chip strap yesterday from cpap.com so hope to get it sometime next week.

Maskedmechanic · Post by **Maskedmechanic** » Thu Jul 07, 2005 12:12 pm

The 420S has a pressure sensor built into the circuit. The 420G does not. The S will therefore change sounds with each breath made to a greater extent than the G model. The overall difference is relatively minor. If you feel that the additional sound is greater after considering this, you should get the S checked.

bigheadr · Post by **bigheadr** » Thu Jul 07, 2005 3:03 pm

I wonder if these two issues are related. Maybe the tube that has the little tube is defective since maybe the pressure sensor isn't sensing my breathing and so the compliance meter reads zero. I will need to check this when my Silverlining software comes. Has anyone have problems with the pressure sensor tubing for their 420S or 420E?

gailzee · Post by **gailzee** » Thu Jul 07, 2005 3:19 pm

I have had no problems re: Silverlining software readouts. But I do notice the noise esp. inhalation. It doesn't bother me, as I have a background white noise sound machine on at the same time, but I can see where the noise (of one's own breathing) could be annoying. I'd rather hear myself breathing than not hear a sound at all.........

Maybe the pressure sensing tube is acting up? I do notice a small hissing sound out of mine, I think it's stretched so I have it pretty well jammed in and blocked off.......I think time to get a new hose/pressure tubing to use. I've only used in for 5 mos. I do not think it should be hissing air like that. I do have another 6' hose which I'm going to trade with the one I'm using (I have an entire back up set for travel). See if the hissing is alleviated.
Once you get the silverlining downloaded you can see if you have leaks, etc. I check mine daily.

[quote="bigheadr"]I wonder if these two issues are related. Maybe the tube that has the little tube is defective since maybe the pressure sensor isn't sensing my breathing and so the compliance meter reads zero. I will need to check this when my Silverlining software comes. Has anyone have problems with the pressure sensor tubing for their 420S or 420E?

bigheadr · Post by **bigheadr** » Thu Jul 07, 2005 5:52 pm

I notice that the small tube for the pressure sensor is pinched at the opening where it comes out from the large tubing. Does the air flow of this small tube get affected by this pinching? Also, do you take off the tubing with the small tube to dry out everyday or do you just have the tubing attached all the time on the 420E?

gailzee · Post by **gailzee** » Thu Jul 07, 2005 7:27 pm

You should have received 2 little plug in type plastic jobbers, to put in the 2 ends of the pressure hose. My DME for what she knew (nearly nothing), said I should never ever get it wet, or water down into the pressure tube. She actually recommended taping the 2 jobbies to the top of the 420E. I wash the hose 2x's a wk. Facial pcs, nasal pillows, short hose connector, daily. Just something I do. Obviously if I'd have a cold, or wh at not, I'd wash the large hose more frequently. Yes, the hose is somewhat pinched, coming out the side of the rubbery piece but it seems open enough. My silverlining does record properly (I am hoping) and I've been able to see my progress, so I think the hosing is fine the way I describe. I leave the small pressure tubing attached all the time.
Seems ok to me..........
What I do for cleaning the pressure hosing, I insert a barely damp QTip, and clean out the ends that way, then use a dry one. It usually seems clean then.........

[quote="bigheadr"]I notice that the small tube for the pressure sensor is pinched at the opening where it comes out from the large tubing. Does the air flow of this small tube get affected by this pinching? Also, do you take off the tubing with the small tube to dry out everyday or do you just have the tubing attached all the time on the 420E?

Maskedmechanic · Post by **Maskedmechanic** » Thu Jul 07, 2005 8:04 pm

As to the little tube, if you can blow air thru it with your mouth, it is working ok. If it has water in it, the cpap pressures will be come very unstable. Blow any water out. A can of compressed air (any office supply store has them) will blast water out.

Is not not amazing the things that we do for some rest....

rested gal · Post by **rested gal** » Thu Jul 07, 2005 8:24 pm

Seems that I remember someone saying they plugged the little sensor tube with golf tees when rinsing out the main hose. I think they came up with the golf tees idea after they had lost the little plugs that came with it.

Personally, I see no reason to go through elaborate daily (or even weekly) cleaning rituals with a main air hose - PB or any mfgr's air hose. Filtered air comes from the machine into a water chamber that's clean too, if I'm using distilled water - which I use, simply adding as needed. I figure the humidified air going up the main hose is clean enough....for me, anyway.

snoozeandlose · Post by **snoozeandlose** » Fri Jul 08, 2005 7:28 pm

I have a PB 420 E and even though I decided to set it as a CPAP instead of an APAP the pressure still fluctuates when I inhale and exhale. It reads as being set on CPAP. Is it defective?

ozij · Post by **ozij** » Sat Jul 09, 2005 1:25 am

The machine has a sensor
When you inhale, it senses a pressure drop
When you exhale, it senses a rise in pressure.

I think that the "fluctuation" you hear is the machine adjusting to those changes, in order to maintain the pressure level you requested. This ability to sense changes and adjust to them is the same whether on straight PAP or on auto.

I have a 420E, had it on straight for a week, it behaved just like yours, and it didn't even occur to me to worry. However, that's my thinking - not my knowledge. If you're still worried, ask someone who knows.

O.

snoozeandlose · Post by **snoozeandlose** » Sat Jul 09, 2005 2:58 pm

thanks for the information. I am rather paranoid since I bought the machine on cpap.com and didn't have vendor to walk me through the settings. I was having increased fatigue and sleepiness with an old machine and couldn't get infor a sleep study until the end of August so I decided to buy an APAP so It would adjust if I needed more than the pressure at 10. However, I felt terrible after using it an the APAP setting. So I increased the constant setting to 12 and don't feel much better after several nights. In the past I noticed an immediate difference. Oh well, maybe I am expecting too much. Thanks again.

Operating noise difference between the 420G and 420S

Operating noise difference between the 420G and 420S

420E

420E tubing