An EC meter is sort of like an Ohm meter, but is calibrated to measure
conductivity per cubic centimeter using a high frequency AC current
source [Sort of jiggles the ions rather than sending them scooting or
making new ones] to avoid adding the meters influence to electroysis,
whereas, an Ohmmeter does *total* resistance, the inverse of conductivity.
An Ohmmeters DC current will do or add to electrolysis, upsetting the
reading and the probes don't have a calibrated distance or area for volume
measurement.
PS NO meter measures "PPM".
A TDS meter IS an EC meter where the conductivity reading is used in a
formula to get a number that corresponds to PPM in salt water.
Different types of salt water use different formulas..and CS isn't any of
those.
The main problem with TDS meters isn't how they work [they work the same
way], but readout resolution and range read error..range usually from 0 to
~4000 uS [0 to 2000 PPM] accurate to +/- 2% usually calibrated at around
300 PPM and we are looking at readings down around 0-8, the way bottom of
the range.
Comparing identical TDS meters, they may read as much as 3 digits apart
in the same sample [not usually that bad, but 1 digit is common] The
difference between digits is around 4 PPM max in silver water and you don't
know where it's about to flip to which next whole digit. If it read in
tenths, you would know.
The range of an EC meter is far less and is used more within the intended
range with a decimal place of resolution and no conversions to unconvert.
Comparing even different *brands* of EC meters in the same sample, they
generally get within a couple of tenths of a Microsiemen [uS / cc ] from
each other.
A TDS and an EC meter use the same principles, but an EC meter is a far
better meter for the application.
And there are still more nuances to getting an accurate reading with either
one.
"When" you take the measurement counts a lot....as much as 50%
And they only read the conductive ionic portion of a batch [ Not TOTAL
silver] which can vary as much as 15% at under 30 uS
At over 30 uS all meters are pretty much useless in EIS [CS] due to the
Silver ion saturation limits of water.
Ode
Is an EC the same as my continuity tester? If it is, I will pull mine
out & check the units. Because, believe it or not, I'm an
electrician. Thanks Ode
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