CPAPtalk.com

Wulfman... wrote:

Guest wrote:Can you send me a procedure for calibration (I am a Medical Engineer and should be able to follow the procedure accurately)

A number of links to help you check your machine's output calibration.

Den
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viewtopic.php?f=1&t=4506&p=37259&hilit= ... ter#p37259

viewtopic.php?f=1&t=49152&p=450105&hili ... er#p450105

viewtopic/t34949/How-to-build-your-own- ... -home.html

https://www.cpap.com/productpage/guage- ... ssure.html

https://www.cpap.com/productpage/fisher ... amber.html

http://www.cpap-supply.com/Articles.asp?ID=132

http://www.rverscorner.com/manometer.html

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Thanks for the links - interesting and helpful

If the manometer shows that the CPAP machine is in error, how do I calibrate the CPAP machine

Reuven Gruber wrote:

Wulfman... wrote:

Guest wrote:Can you send me a procedure for calibration (I am a Medical Engineer and should be able to follow the procedure accurately)

A number of links to help you check your machine's output calibration.

Den
.

viewtopic.php?f=1&t=4506&p=37259&hilit= ... ter#p37259

viewtopic.php?f=1&t=49152&p=450105&hili ... er#p450105

viewtopic/t34949/How-to-build-your-own- ... -home.html

https://www.cpap.com/productpage/guage- ... ssure.html

https://www.cpap.com/productpage/fisher ... amber.html

http://www.cpap-supply.com/Articles.asp?ID=132

http://www.rverscorner.com/manometer.html

.

Thanks for the links - interesting and helpful

If the manometer shows that the CPAP machine is in error, how do I calibrate the CPAP machine

It might depend on what you find.
I see in your profile, you're using pretty low pressure settings......."Pressure limits 4.0 to 8.0"
If it's "right on", you obviously wouldn't need to do anything.
If it's a little lower (or higher), you could adjust your pressure settings to compensate for that.

Here's an example from one of my own machines......a "lightly used" APAP I bought back in 2006. I didn't realize until I acquired my gauge manometer in 2011 that it was putting out about 3 - 3.5 cm. higher pressure than the setting. I use straight pressure, so I just set my machine to a setting of 10 cm. and then the output was about 13 - 13.5 cm., which was about right. The only thing it affects is what appears on the reports for a setting. It still records all the events normally.

Your other option would be to have it sent in to the factory through a ResMed dealer (DME) and have it "properly" calibrated.

When you check your machine's output, be sure to set it to straight pressure for some of the settings in your range.


Den

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Unfortunately it's more than checking pressure like flow. The ResMed's calibration program is really the only the way to fully check/calibrate it. You can reach a specified pressure but the flow can be lacking. Learnt that one from working on ventilators and blueprinting carburetors. The calibration program has specs it needs to meet. The manufactures & models have different methods. It's like at a certain pressure or flow the motor may need to be turning in a certain rpm range or not using to much current. One manufacture use to measure the resistance of the windings of motor in their program. It would fail the calibration before the motor would actually fail.

Reuven: You have to be factory trained to access ResMed's tech website. Where their calibration programs are. Plus you need to buy some piecy parts for the cal. You can't get by with just a pressure and flow analyzer.

WRX03 wrote:Unfortunately it's more than checking pressure like flow. The ResMed's calibration program is really the only the way to fully check/calibrate it. You can reach a specified pressure but the flow can be lacking. Learnt that one from working on ventilators and blueprinting carburetors. The calibration program has specs it needs to meet. The manufactures & models have different methods. It's like at a certain pressure or flow the motor may need to be turning in a certain rpm range or not using to much current. One manufacture use to measure the resistance of the windings of motor in their program. It would fail the calibration before the motor would actually fail.

That's what people don't take into consideration..... There is a plug with a orfice to vent pressure, I have forgotten the size of the hole, but it gives the xpap the correct vent rate so you can correctly measure the pressure. You could also put a good mask on and take the reading while not breathing. Most meters are made for profit not to measure correctly. Good tools cost money! As Den says, if a pressure is incorrect */- it until it's correct, it's not rocket science, it's air..... Jim

Wulfman... wrote:If the manometer shows that the CPAP machine is in error, how do I calibrate the CPAP machine

It might depend on what you find.
I see in your profile, you're using pretty low pressure settings......."Pressure limits 4.0 to 8.0"
If it's "right on", you obviously wouldn't need to do anything.
If it's a little lower (or higher), you could adjust your pressure settings to compensate for that.

Here's an example from one of my own machines......a "lightly used" APAP I bought back in 2006. I didn't realize until I acquired my gauge manometer in 2011 that it was putting out about 3 - 3.5 cm. higher pressure than the setting. I use straight pressure, so I just set my machine to a setting of 10 cm. and then the output was about 13 - 13.5 cm., which was about right. The only thing it affects is what appears on the reports for a setting. It still records all the events normally.

Your other option would be to have it sent in to the factory through a ResMed dealer (DME) and have it "properly" calibrated.

When you check your machine's output, be sure to set it to straight pressure for some of the settings in your range.[/quote]
it's nowhere near that simple, that's not recalibrating the machine, it's compensating for a potential error, and worse, it would have no effect, whatsoever, on Reuven Gruber's problem, which is that either smartstart isn't starting the machine, or stopping it.

I wonder if my automatic start/stop would work better if there were an adjustable infinite sensitivity control,
instad of the mask settings, which fail to consider SIZE of the interface.

According to Reuven's profile on the Apnea Board's site, he's in Israel. (he asked the same question over there)
If he doesn't have a readily handy ResMed DME or repair facility, I was suggesting an alternative (workaround) to sending it in to the factory and being without it for a period of time.
If the pressure is "accurate", according to the manometer testing, it may be something else.......a setting, a mask/pressure combination or something else that doesn't autostart the machine.

I have an out of warranty machine where the autostart function doesn't work.

I was NOT trying to offer a solution to "calibrate" the machine.
Another "workaround" would be to not rely on the autostart and manually turn it on and off.
Some people have trouble with the "quote" function on the forum, too.


Den

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From the manual Page 32:

SmartStart is enabled, but the device does not automatically start when the patient breathes into their mask

Breath is not deep enough to trigger SmartStart. To start therapy, take a deep breath in and out through the mask, before breathing normally.

Press Start.

There is excessive leak. Adjust the mask and headgear.

Air tubing may not be connected properly. Connect firmly at both ends.

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SmartStart is enabled, but the device does not automatically stop when the patient removes their mask Incompatible mask being used. Only use equipment recommended by ResMed.

Contact ResMed or see http://www.resmed.com for more information.

If the patient is using a nasal pillows mask with set pressure less than 7 cm H2O, SmartStart will not work and should be
disabled.

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Mask in profile:
Mask: AirFit™ P10 Nasal Pillow CPAP Mask with Headgear


And, I'm fully aware of the OPs previous postings.

The function worked fine for a long time and then stopped functioning

Smart start is NOT working with a full face mask as well as with pillows

I have another Air Sense 10 and the smart start function works fine with both the pillows and the full face mask

My settings are 4 for the starting pressure and 8 for the maximum pressure

Den

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Wulfman... wrote:If he doesn't have a readily handy ResMed DME or repair facility, I was suggesting an alternative (workaround) to sending it in to the factory and being without it for a period of time.

unfortunately, your "workaround" completely misses the point, and would have zero effect on his troubles.

Wulfman... wrote:

Reuven Gruber wrote:I have an out of warranty machine where the autostart function doesn't work.

Wulfman... wrote:If the patient is using a nasal pillows mask with set pressure less than 7 cm H2O, SmartStart will not work and should be
disabled.Mask in profile:
Mask: AirFit™ P10 Nasal Pillow CPAP Mask with Headgear


And, I'm fully aware of the OPs previous postings.

Smart start is NOT working with a full face mask as well as with pillows

then, why high-light what you did??

palerider wrote:

Wulfman... wrote:If he doesn't have a readily handy ResMed DME or repair facility, I was suggesting an alternative (workaround) to sending it in to the factory and being without it for a period of time.

unfortunately, your "workaround" completely misses the point, and would have zero effect on his troubles.

Wulfman... wrote:

Reuven Gruber wrote:I have an out of warranty machine where the autostart function doesn't work.

No it doesn't. If it's putting out the proper amount of air and all that's not working is the autostart/autostop, then you press the button to start and stop it. I don't consider that a huge problem.

And,

palerider wrote:

Wulfman... wrote:If the patient is using a nasal pillows mask with set pressure less than 7 cm H2O, SmartStart will not work and should be
disabled.Mask in profile:
Mask: AirFit™ P10 Nasal Pillow CPAP Mask with Headgear


And, I'm fully aware of the OPs previous postings.

Smart start is NOT working with a full face mask as well as with pillows

then, why high-light what you did??

I highlighted that portion of the clinician manual in case there may something he hasn't checked with the pressure setting and mask with THAT machine. If he's got a spare machine......GREAT! That's why we have them. We either get them fixed or live with the idiosyncrasies.


Den

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Wulfman... wrote:

palerider wrote:

Wulfman... wrote:If he doesn't have a readily handy ResMed DME or repair facility, I was suggesting an alternative (workaround) to sending it in to the factory and being without it for a period of time.

unfortunately, your "workaround" completely misses the point, and would have zero effect on his troubles.

Wulfman... wrote:

Reuven Gruber wrote:I have an out of warranty machine where the autostart function doesn't work.

No it doesn't. If it's putting out the proper amount of air and all that's not working is the autostart/autostop, then you press the button to start and stop it. I don't consider that a huge problem.

in other words:
poster: "I have problem x"
you: "here's how you can check to see if you have problem y"

palerider wrote:

Wulfman... wrote:

palerider wrote:

Wulfman... wrote:If he doesn't have a readily handy ResMed DME or repair facility, I was suggesting an alternative (workaround) to sending it in to the factory and being without it for a period of time.

unfortunately, your "workaround" completely misses the point, and would have zero effect on his troubles.

Wulfman... wrote:

Reuven Gruber wrote:I have an out of warranty machine where the autostart function doesn't work.

No it doesn't. If it's putting out the proper amount of air and all that's not working is the autostart/autostop, then you press the button to start and stop it. I don't consider that a huge problem.

in other words:
poster: "I have problem x"
you: "here's how you can check to see if you have problem y"

And, by far, your most "helpful" post so far........

in other words, there's nothing you can do about this, because if either of the two sensors involved were faulty, the machine wouldn't run in the first place, it would fault and pop a service message.

Translation....... "Just push the On/Off button. It's either broke or it isn't."


Den

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