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air flow sensor

air flow sensor

air flow sensor

Hi all,
I'm involved in building a medical device which requires a sensor to measure the flow of breathing. In similar devices, pneumotachometers are used. The problem is pneumotachometers are very sensitive with the gas's composition which is changed during the operation. The error is significant. Can any body recommend other types of sensors to measure the flow?
Thank you very much,

RE: air flow sensor

Hi, hot thermistor is the usual way.

RE: air flow sensor

If you are really interested in measuring the mass flow, you could as was suggested, emulate a MAF or MASS AIR FLOW as is used in automotive systems to measure the mass of air intake. It uses a hot wire that has a thermister directly adjacent to it. A current it flowing in it to maintain a temperature of say 115 degrees. The current is measured to determine the mass of air flow through chamber. I don't have a source right now for these , I look into it.

RE: air flow sensor

Thank you very much for your advices. I appreciate that.

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