I'm working on an euipment for measuring water quality through arduino tools, as well as tubes and such. What i want to know is if anyone knows any good nitrate and phosphate water sensors that can easily interconnect to the arduino. It's somewhat tricky on trying to find either sensors, especially the latter, as I'm trying to find sensors that are somewhat similar to those from Aqua Read or Euteka Water Probes.
You may know more about this type of sensor than anyone else on the forum. If you suggest the sensors (post links), the forum can advise if they are, or could be made, arduino compatible.
I see. Well, after some searching, here are some nitrate sensors that I found:
https://www.ysi.com/product/id-599709/exo-nitrate-smart-sensorhttps://in-situ.com/us/aqua-troll-nitrate-ise-sensor
The phosphate sensors were trickier to find, but here's what I managed to dig up:
An Arduino can interface with just about any sensor. The important point is to make sure that the sensor accomplishes what you want it to do, with the required resolution and accuracy. You should be looking at commercial grade selective membrane or optical (spectroscopic) sensors.
Many of the phosphate/nitrate sensors sold for Arduino are actually fakes, especially the so called "NPK soil sensors". They measure conductivity, and make up numbers for other "readings".
At least one of the devices offers data communication based on RS-232, so with a common adapter to convert RS-232 to TTL, it could easily be interfaced to any Arduino. The others are not willing to give such information.
With all these sensors you need to look at disturbing components (basically components that will lead to a positive reafing when present).
As long as those components are not present, it may work...
Your selection of equipment seems pretty good. My guess is that these will be quite expensive...