Hello all
For my project intended for use in aquaculture wanted guidance on proper probe/sensors fit for measuring ammonia,nitrate,nitrite in aquaculture(fish farming).Also did research and found mq137 gas sensor could measure ammonia but don't know as some input suggest it doesn't properly show relevant results, operation not smooth etc(do correct if wrong)..Thanks once again
I looked into this some time ago. And a that point, the only probes that were available were very expensive. In the ball park of $800-$1000 USD. I would guess they have come down in price since then. But I doubt they are in my price range. Maybe you're more financially able than I am though.
I'll also add that at least one sensor wasn't even invented/developed at the time. Not sure which though.
testing is based on water sample and drop of reactant.
results are color based from the reaction.
you can use a peristaltic pump and drop a couple drops into your water sample
then check the color with a color sensor.
then flush your test chamber with fresh water.
you can use a hypodermic needle with reactant and a stepper and dose with minute amounts.
this seems elaborate, but since there is no cheap sensor, you might need to make your own.
dave-in-nj:
testing is based on water sample and drop of reactant.
results are color based from the reaction.you can use a peristaltic pump and drop a couple drops into your water sample
then check the color with a color sensor.
then flush your test chamber with fresh water.you can use a hypodermic needle with reactant and a stepper and dose with minute amounts.
this seems elaborate, but since there is no cheap sensor, you might need to make your own.
Want to know will it be possible to identify exact shade without issue or will I need any programming as it may happen to identify any near shade of color
Actually, colorimetry is reasonably accurate and used in many processes, as long as your equipment is adequately engineered - precision amounts of (stable) reagent, accurate metering pumps, regulated power supplies, temperature control is probably required and it is performed for your actual sample alternating with a "control" sample so you need two injection systems.
See if water with the contaminants you seek will absorb colors that clean water will not. One person has already shown ability to tell liquids in clear bottles apart using red, green and blue leds as DIY color detectors.
You will be forced to calibrate.
But that is not hard.
AAlso if you are dealing with fish or plants the accuaccuracy is not critical.
The window of acceptable is rather wide
If you used a sloppy sensor you could still alarm when it got out of range.
And any alarm would require your intervention.
Lastly there are many people on this forum that have an interest that you would get help along the way