Making your own TDS meter calibration fluid
Hello all.
I have a TDS meter and I would like to calibrate it so I can verifiy my 4dkh drop checker solution. I want the tds meter to be as close as possible to the actual result. Normally I wouldn't bother calibrating it because I'm usually only interested in TDS deltas rather than the true figure.
My NaCl calibration fluid has mostly evaporated leaving inaccurate results. I need to get more, but I don't want to pay for it. I have aquarium salt and Morton's table salt. Using aquarium salt, or deionized seems to be the way to go. I have a gram scale and 50 mL graduated cylinder to make the solution.
Now just going over this in my head, since the TDS meter reads both positive and negatively charged ions, 1 mg of NaCl in 1L of water should raise the TDS by 1...is this correct?
so if I add 500mg of NaCl to 1L of water the TDS should be 500?
I have a TDS meter and I would like to calibrate it so I can verifiy my 4dkh drop checker solution. I want the tds meter to be as close as possible to the actual result. Normally I wouldn't bother calibrating it because I'm usually only interested in TDS deltas rather than the true figure.
My NaCl calibration fluid has mostly evaporated leaving inaccurate results. I need to get more, but I don't want to pay for it. I have aquarium salt and Morton's table salt. Using aquarium salt, or deionized seems to be the way to go. I have a gram scale and 50 mL graduated cylinder to make the solution.
Now just going over this in my head, since the TDS meter reads both positive and negatively charged ions, 1 mg of NaCl in 1L of water should raise the TDS by 1...is this correct?
so if I add 500mg of NaCl to 1L of water the TDS should be 500?
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Since TDS is a measurement of ions in water, adding sodium chloride to 1L of water would give you a reading of 1000 mg/L.
Or there abouts. Conductivity isn't the best way to measure TDS, but is reasonably accurate for inorganic salts.
Or there abouts. Conductivity isn't the best way to measure TDS, but is reasonably accurate for inorganic salts.
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