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EC formula troubleshooting
FuZzY619started grow question 2 years ago
To get an EC value, I must multiply the ppm reading by 2 and divide by 1000. But my TDS tester gives me both microSiemens and ppm reading.. which measurement do I use to get the correct EC value, microSiemens or ppm?thank you in advance.
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m0useanswered grow question 2 years ago
Often the literature will use microSiemens (uS/cm) and EC standing for electrical conductivity. These two units are the same.
http://www.maherjabado.com/ec-ppm-table.JPG
Just may need to round the decimal point over a bit to get a EC of 1.0,
Depending on the scale 500ppm or 640ppm 700ppm is all 1.0EC,
That's why EC is more accurate then PPM. PPM is not truly accurate because all TDS pens do is measure EC.
A true PPM count is done with a different machine.
If you make a solution and test its EC at 1.0 or 1000ms/cm, then switch it to ppm you will find your scale.
If your meter says 500ppm then you know that's your scale.
Can test with salt water and save nutrients.
Good Luck!
Chow_13answered grow question 2 years ago
Like mouse said use the uS/cm value as it is the same as ec just a smaller measurement. Its like millimetre to centimetre or feet and inches . PPM can vary depending the device.
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