EC/PPM Help!

Tannerwilliams919 · May 28, 2020

I bought this ppm/ec meter on Amazon. It doesn't state which conversion method to use for the ppm and I can't seem to get an answer. It provides EC in microsiemens per centimeter (μS/cm). How do I convert this to an actual EC value so I can get an accurate reading on my nutrients?

MrGreenFingers99 · May 28, 2020

You divide the number by 1000 to get EC so that reading will be 0.056 EC, I would guess that means that meter is reading on the 500 scale because if you multiply your 0.056 EC reading by 500 it will equal 28 PPM which is pretty close to you 30 reading.

Tannerwilliams919 · May 28, 2020

MrGreenFingers99 said:
You divide the number by 1000 to get EC so that reading will be 0.056 EC, I would guess that means that meter is reading on the 500 scale because if you multiply your 0.056 EC reading by 500 it will equal 28 PPM which is pretty close to you 30 reading.

You, my good sir, are a life saver. - Thank you so much.

topfuel29 · May 28, 2020

You have a really nice meter. That was a good choice to buy. I would only add that temp. is a factor if your nutrient solution goes above 75F. or below 60F. Good Luck on your Grow.
The Effect of Temperature on Conductivity Measurement

Renfro · May 28, 2020

To convert to EC from uS.

Lets say you have a reading of 2000 uS (EC of 2.0)

To use a 0.5 conversion you simply multiply by 0.5. so 2000 x 0.5 = 1000 PPM

Using 0.7 conversion is the same procedure. 2000 x 0.7 = 1400 PPM

cobshopgrow · May 29, 2020

uS is micro siemens, thats EC.

have you tried switching the mode by pressing the mode button?
looks like it will show TDS scale PPM then and do the conversion for you.
would simply stick with EC, us/cm, tbh, there are like you see more PPM conversion scales, thats confusing.

Tannerwilliams919 · May 29, 2020

cobshopgrow said:
uS is micro siemens, thats EC.

have you tried switching the mode by pressing the mode button?
looks like it will show TDS scale PPM then and do the conversion for you.
would simply stick with EC, us/cm, tbh, there are like you see more PPM conversion scales, thats confusing.

It only gives me the microsiemens per centimeter. I was trying to figure out how to convert that to EC.

First answer was what I needed: divide the microsiemens per centimeter number by 1,000 to get the EC. Not even going to bother with the PPM anymore... All I need to know and care about is the EC.

cobshopgrow · May 29, 2020

yep thats right, divide by 1000 or imagine a dot after the first digit on the display when the reading is above 1000, below imagine a 0. in front.
its the same unit, Siemens, its just micro what your meter is showing, 1000st of 1.
EC is measured in Siemens, the rest is just scaling.
anyway, thought you wanted to convert to some PPM scale.

quoted from above.
"Lets say you have a reading of 2000 uS (EC of 2.0) "
there you go.
its not really a conversion you need to do, just some scaling.

Distortionist · May 30, 2020

Dude I have the same one. It has an EC mode. Press the mode button. I never used it but I am sure I saw it. I may have the manual here if you want me to dig it up if I can.

70's natureboy · May 31, 2020

I'm surprised amazon doesn't try to bundle that meter with calibration solution. Whatever you do, don't buy any. It's more interesting to guess.

Tannerwilliams919 · May 31, 2020

Distortionist said:
Dude I have the same one. It has an EC mode. Press the mode button. I never used it but I am sure I saw it. I may have the manual here if you want me to dig it up if I can.

Thanks brother, I figured it out. It has an EC mode but I wasn't sure how to convert it into what I needed. Got it now!

rkymtnman · May 31, 2020

the big block letter kinda give it away: TDS/EC. it reads in EC so why do you need to convert it to EC?

Tannerwilliams919 · May 31, 2020

rkymtnman said:
the big block letter kinda give it away: TDS/EC. it reads in EC so why do you need to convert it to EC?

It gives me the EC in microsiemens per centimeter. I needed to know how to convert that to siemens. That's all.

GBAUTO · May 31, 2020

Tannerwilliams919 said:
It gives me the EC in microsiemens per centimeter. I needed to know how to convert that to siemens. That's all.

When folks are referring to using, say an ec of 1.3, that is in MILLI siemens.
milli is 1/1000th, micro is 1/1000000
Divide the ec reading by 1000
1000 micro siemens is the same as 1 milli siemen

EC/PPM Help!

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