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I thought about this for the flow measurement.. and I think you could put the WHOLE BOARD into a PVC Pipe Tee arm and then all you need is a plug for the wires to come out. Dr. William J. Schmidt -

I believe that is what my car uses for the Mass Flow sensor. Would it be realistic to do something like a heated and non heated thermistor pair. That may be heading down an engineering effort beyond

I don't think we can successfully 3D print a port to direct mount to the sensor, but if we agree to mount it on a small board like https://www.adafruit.com/product/2651 we could seal the board in a

I'm new here and jumping in but for what it's worth I agree with hard wire being the most reliable for control.? However remote monitoring is another topic and for that WiFi makes the most sense.?

Thank you so much! I need to go back and re-read the specs, I think they worked on them today, I’m going to send your video to the head honchos at the University so they are aware of your

Differential sensors for flow are almost mandatory, because a slight drift in one of two absolute sensors is a disaster. If I were designing this with unlimited budget, I would use a hot-wire

Well that’s pretty easy. Design for maximum flow first and check resolution. A flow rate of 90 L/m is 1.5L/s… and if you do the math, using a 1 inch pipe (actual 1.029”) solving Bernoulli’s

Very good. That makes things a little less critical than if this sensor was the main parameter controlling the ventilator. Yet, without an ambient reference the ventilator may falsely trigger an

So if we have that sensor, and we need to be able to measure up to 90 L per minute, with a resolution of let’s say at least 2.5 L per minute, and we don’t want to waste a lot of pressure, what

Right.

I think it might be useful for one of the Doctors to use their university logo to talk directly to SMI and see if they can help, promising good press releases, etc. What's the harm? Jack, W8TEE

That is 10 Kpa differential device… Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois Owner – Operator Villa

So the SMI SM7391 (Mouser $26.93 and 15 in stock) are the only parts I can find that work at 0.3 psi. This is a Digital hybrid device, I2C, 16 bit resolution. Nice device if we can find them. This is

We have 10 of these in our city. https://www.digikey.com/product-detail/en/nxp-usa-inc/MP3V5010DP/MP3V5010DP-ND/2186183

We all appreciate your work here, Bill. Jack, W8TEE

Well there is an issue. 2 kPa is 0.29 psi. It is possible to measure that but the sensors available to accurately measure roughly 0.3 psi differential are pretty expensive. The required orifice for

That's very good. Thanks.

Yep..exactly! Jack, W8TEE

Background. Calculations for wedge or orifice meter from Bernoulli’s equations reduce to: AIR =======>A1,P1-->A2,P2-->===== Flow, Q Q = A2 * [ 2*(P1-P2)/(Rho * (1-A2/A1)^2)]^(1/2) … Where, A1 >

Got a video up of a demo https://youtu.be/WxYI2NpauYg