Purifier Negative Ions
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Purifier Negative Ions
Is there an inexpensive/simple way to measure negative or positive ions in the air?
I'd like to know if ions are being emitted by sources (like computer monitors, air purifiers, etc..). Is there an inexpensive, quick and simple way to meaure ion concentrations in the air?
Depends on how precise you expect the results to be...
A simple way of doing this is by collecting the ions in an electric field and by detecting the current with an electrometer.
What you would need is a high voltage source of a few hundred volts to a few kV, a simple plate capacitor made of e.g. aluminum plates, mesh or just foil, an electrometer grade operational amplifier plus a few dozen other electronic parts. Total materials cost is probably less than $100-200, if you know what you are doing.
Unfortunately, the whole aparatus would be very delicate to build and operate and I wouldn't advise trying it unless you are VERY experienced with high voltage and electrometer electronics. This kind of stuff, while conceptually simple, is a nightmare to get into.
Or... you can spend the money on a professional instrument like this one:
http://www.mksinst.com/docs/UR/ion-115_ds.pdf
These guys have done all the engineering for you and you are as ready to go as you ever will be with something as troublesome as ion density measurements.
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