We're planning on using an NPK Sensor to measure the NPK amount in water. Will it work? If not, is there a better alternative sensor that we can use? Thanks!

When you contacted the potential supplier of your NPK sensor and explained your intended use, what did they advise?

Hi, @eyeyrown Welcome to the forum. [image] How to get the best out of this forum IDE 1.x See also FAQ - Arduino Forum for general rules on forum behaviour and etiquette. Hello, Welcome to the Arduino Forum. This guide explains how to get the best out of this forum. P…

[image] eyeyrown: Will it work? An NPK sensor should certainly detect the presence of NPK but to make quantitative measurements (how much NPK is in the water) you need a quantitative sensor that is calibrated. Maybe you can follow the example of this project: [image] Measure Soil Nu…

I wonder what it is that the gizmo linked above actually does? Judging from the slickness and lack of information on the product page, it is almost certainly bogus. With three stainless steel prongs, it certainly does not quantitatively measure nitrogen, phosphorous and potassium concentration in …

I've no need of one myself, but I often wondered how those soil probes worked (or not....). EDIT: Seems that there may be some science behind those 3 prong NPK sensors. I found a paper published in the International Journal of Engineering Research & Technology (IJERT) that had this paragraph: A] …

Again, ask a professional if those work. I have, and they don't. It is currently a hot topic in agribusiness research to come of up a cheap method of estimating NPK concentrations using simple measurements like conductivity, pH, etc. The really big companies are trying to use machine learning soil…

Can we use an NPK sensor to measure NPK contents in water?

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TomGeorge September 12, 2022, 11:01am 3

Hi, @eyeyrown
Welcome to the forum.

Can you please post a link to the specs/data of the sensor?

Thanks.. Tom....

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Can we use an NPK sensor to measure NPK contents in water?

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