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beniroquai / Open-Oxygen-Flowsensor

This will be an open-source oxygen flowsensor
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Procedure for calibrating the device - at air #5

Open beniroquai opened 3 years ago

beniroquai commented 3 years ago

Have a button that can be pressed (long button press), to calibrate the device using air (20.9%)

subirbhaduri commented 3 years ago

Hi Benedict. For calibration in a frugal setting like in India where dry ice would not be available, could you place the device into a small chamber with a burning candle? If the chamber is closed, the candle consumes all O2 (or most of it) and will give some zero reference for your device. Not sure if this is a good idea to get zero reference.

beniroquai commented 3 years ago

Hey, thanks for your comment! We already investigated this idea. The problem with this is, that the candle is made out of paraffin which will not only produce CO2 while burning. Also, there will always be a rest amount of O2 in the box. Manu and Honquan Li suggested using 100% as a reference. Alternatively, do you know if these gas cylinders are available in India?

image

This is for adding CO2 to your tap water. Alternatively, we may think of having sparkling water bottles? Not sure if this could work..

subirbhaduri commented 3 years ago

Oh ya, that could be an issue. Maybe sparkling water is not available in India, but Coke and Pepsi are, and i guess the gas embedded is CO2. However how can you expose the sensor to a CO2 laden liquid?? Don't know, lets think.

On Mon, Jun 14, 2021 at 10:36 AM Benedict Diederich < @.***> wrote:

Hey, thanks for your comment! We already investigated this idea. The problem with this is, that the candle is made out of paraffin which will not only produce CO2 while burning. Also, there will always be a rest amount of O2 in the box. Manu and Honquan Li suggested using 100% as a reference. Alternatively, do you know if these gas cylinders are available in India?

[image: image] https://user-images.githubusercontent.com/4345528/121841610-f3cc7180-ccde-11eb-83bf-47572a07f13a.png

Alternatively, we may think of having sparkling water bottles? Not sure if this could work..

— You are receiving this because you commented. Reply to this email directly, view it on GitHub https://github.com/beniroquai/Open-Oxygen-Flowsensor/issues/5#issuecomment-860365297, or unsubscribe https://github.com/notifications/unsubscribe-auth/ANPIKLKRNIWIH7WQNQOHX4DTSWE63ANCNFSM46IGHXPA .

subirbhaduri commented 3 years ago

O2 bottles may also be widely available, and can be used just for calibration if the calibration does not change over say a period of 1 month or something like that.

On Mon, Jun 14, 2021 at 5:58 PM Subir Bhaduri @.***> wrote:

Oh ya, that could be an issue. Maybe sparkling water is not available in India, but Coke and Pepsi are, and i guess the gas embedded is CO2. However how can you expose the sensor to a CO2 laden liquid?? Don't know, lets think.

On Mon, Jun 14, 2021 at 10:36 AM Benedict Diederich < @.***> wrote:

Hey, thanks for your comment! We already investigated this idea. The problem with this is, that the candle is made out of paraffin which will not only produce CO2 while burning. Also, there will always be a rest amount of O2 in the box. Manu and Honquan Li suggested using 100% as a reference. Alternatively, do you know if these gas cylinders are available in India?

[image: image] https://user-images.githubusercontent.com/4345528/121841610-f3cc7180-ccde-11eb-83bf-47572a07f13a.png

Alternatively, we may think of having sparkling water bottles? Not sure if this could work..

— You are receiving this because you commented. Reply to this email directly, view it on GitHub https://github.com/beniroquai/Open-Oxygen-Flowsensor/issues/5#issuecomment-860365297, or unsubscribe https://github.com/notifications/unsubscribe-auth/ANPIKLKRNIWIH7WQNQOHX4DTSWE63ANCNFSM46IGHXPA .

beniroquai commented 3 years ago

For this we can build a 3D printed adapter.