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Water level sensors in a mono tube boiler

Posted by mike t 
Re: Water level sensors in a mono tube boiler
February 21, 2017 03:56PM
On my heat exchanger there is a small amount of boiler trim. Its the safety valve. when I crank my engine over by hand it will make 3 to 5000psi. This happens at the top of the heat exchanger where the safety valve will automatically vent water from this, I know there is no air/steam space only hydraulic.
Re: Water level sensors in a mono tube boiler
February 22, 2017 01:59PM
jjtjr Wrote:
-------------------------------------------------------
> zimirken
> do you have a link for the demo of water level
> control.

[youtu.be]
video of it in action. This is an old video and I've made improvements since then. I plan on actually working on it this summer.

[imgur.com]
picture of schematic. It's old but it's basically the sparkplug forms part of a voltage divider with a resistor, and it is fed into an analog input.

[pastebin.com]
latest code for steam boiler. I'm now using a propane burner with a fat servo attached to the dial on it.
Re: Water level sensors in a mono tube boiler
February 22, 2017 08:05PM
looks like you may have an error on your drawing. it looks like R4 50 k resistor is shorted out it has ground on both sides
Re: Water level sensors in a mono tube boiler
February 23, 2017 06:43AM
Oh yeah, I used the schematic as more of a general guideline to build the circuit on perfboard, so there are probably errors like that.
Re: Water level sensors in a mono tube boiler
June 29, 2017 06:00AM
A nod to Bill G. , this is what he is talking about, contactless liquid level sensing:
[www.google.no]
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