Ethylene gas sensor for school science fair

Does anyone know of a ethylene gas sensor under $100, if not would a flammable gas sensor work too?

Look for sensors that include ethylene gas in their list of gasses they can sense.

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Does it have to be ethylene-specific?
There are plenty of devices that detect volatile organics, like the MQ-5.

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I'm looking for something that can detect ethylene (a plant hormone for ripening fruits) so I can build a circuit to detect how ripe a fruit is.

Sensors that detect just one gas, and are not confused by others, tend not to be low cost.

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Winsen makes one, but it's marginally over your budget. Beware of fakes if you see it offered significantly cheaper.

For your science fair though, why not try the sensor Awol suggested?

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So it doesn't need to be specific at all, the only volatile gas fruit produce is ethene so any volatile sensor will do. You might get extra marks for giving the IUPAC name for the gas too!

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Thank you for the help but, is there any volatile sensor that will do the best or will all of them be the same?

Define "best"

The data sheets for the sensors will tell you what gasses they react to and the sensitivity to each gas. As for what is best, you decide, since it is your definition of "best".

Most accurate is what I'm looking for

I suggest that it doesn't matter at this stage and that it's a lot better to get something functional for your science fair than to spend time in analysis paralysis.

On any project with unfamiliar hardware, I expect to learn things along the way. Some of that learning may be quite unwelcome, possibly involving a release of magic smoke, and it's quite possible that the final deliverable will be rather different than that which was initially envisaged.

Given that, the most important thing is to get started - don't let the perfect be the enemy of the good :wink:

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Accuracy can ONLY be compared after calibration of the sensor. Are you prepared to calibrate the sensor for ethylene gas?

Most accurate = most expensive, as a pretty general rule.