Automatic Inflation Mechanism 1

[Borja1055]

I am trying to design a system with a sensor that can detect when an inflatable is inflated to 2 PSI. I am trying to inflate something small, around 6 liters. I currently have a system that uses a solenoid, the compressed air, and a mechanical timed relay that tells the system when to stop inflating. The issue is that i want to make it using a sensor or gauge to tell the system to stop inflating at exactly 2 PSI.

Please let me know if you can help. All questions, comments, or suggestions are welcome.

Thanks

 

[Compositepro]

A pressure switch is all you need. It would work best if you have a separate line to sense the air pressure from the line that is filling the inflatable.

 

[zeusfaber]

How about sticking with the system you've already got, setting the timer to run for a little bit longer than currently, and installing a relief valve adjusted to limit the pressure to 2 psi?

A.

 

[IRstuff]

So add a pressure sensor? They're basically off-the-shelf items, like

https://www.sparkfun.com/products/11824

which you can connect to an Arduino, or whatever is controlling your inflator

TTFN
faq731-376

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Of course I can. I can do anything. I can do absolutely anything. I'm an expert!

 

[PetieSmo]

The relief valve or a backpressure regulator (with sensor for verification) should give you a good level of control and validation.

 

[tbuelna]

It would help to know details like what the inflatable device is constructed of? What is the volume/pressure of the compressed air reservoir? What is the time period required to inflate the device? When you say 2 psi, can we assume you mean 2 psig?

Personally, I would use the approach others suggested, using a mechanical relief valve to control the inflation pressure. This is the most fool-proof and reliable approach.