You could invoke a small war by asking that question. 😆Has anyone posted a guide on how, when and why to use a TDS Pen along with the benefits?
I have one but never really got to grips with it.
It's quite fun to use though!
In terms of use they are pretty much <"Plug and Play"> & <"Tank Transformation! House Move! I’m scared but join me for the ride!">Has anyone posted a guide on how, when and why to use a TDS Pen along with the benefits?
The reading tells you the amount of dissolved compounds in water but doesn't tell you what kind.Has anyone posted a guide on how, when and why to use a TDS Pen along with the benefits?
That depends on the conversion factor. In North America it's 2, in Europe it's likely to be 1.6 - from what I've read, anyway.TDS meter is the easiest and can be the cheapest gadget. To check its accuracy and calibration, dissolve 0.3 grams of kitchen salt in 1 L distilled water and read 300 ppm on NaCl scale, or 614 on µS scale.
The reading tells you the amount of dissolved compounds in water but doesn't tell you what kind.
Excellent article, thank you!There is a section in <"Some handy facts about water"> under "Electrical Conductivity" and in some of the subsequent posts in that thread.
TDS is a basic electrical resistance measurement expressed as inversed conductivity value. See Ohm and Siemens.That depends on the conversion factor. In North America it's 2, in Europe it's likely to be 1.6 - from what I've read, anyway.
TDS is a basic electrical resistance measurement expressed as inversed conductivity value. See Ohm and Siemens.
There isn't an article as such, I was going to include it in the "Cycling" article, but I haven't written it yet. I'll link in some more threads at lunchtime when I have some time.Is there one about biological oxygen demand BOD, a measure of the amount of oxygen required to remove waste organic matter from water in the process of decomposition by aerobic bacteria?
This website publishes ppm as PPM and calls µ a weird letter. I have to say, not very convincing place to learn from.
I have to say I was a little confused by it as well. It does seem to make more sense that conversion actor changes depending on the dissolved solid and that the scale of µS/cm doesn't change. Thanks for clearing that up.This website publishes ppm as PPM and calls µ a weird letter. I have to say, not very convincing place to learn from.
Do you want to get NaCl ppm value or real electrical conductivity value
That is it, but conductivity, not PPM TDS. You can only measure the Total Dissolved Solids, by evaporating a known volume of water to dryness. I've done this and <"I really can't recommend it">.TDS is a basic electrical resistance measurement expressed as inversed conductivity value. See Ohm and Siemens. ......... On TDS testers calibrated in µS this solution displays 614 because this is the real electrical conductivity expressed in inversed value of Ohm, the Siemens unit.
This is one reason I like conductivity meters, you can make up the <"calibration solutions really easily">.Dissolved 0.3 grams of kitchen salt in 1 L of distilled water makes 300 ppm NaCl solution no matter what conversion factor. On TDS testers calibrated in µS this solution displays 614 because this is the real electrical conductivity expressed in inversed value of Ohm, the Siemens unit
Use <"serial dilution">, it takes away the need to very accurately measure small weights or volumes.Making your own salt calibration fluid can be a bit hit and miss, depending on how accurate you want things, even with some of those very small scales which say from 0.1g .
If you can get pure KCl it is 0.746g KCl in one litre to give 1411 microS. I keep the 0.1M KCl stock (7.46g in 1000cm3) in a stoppered bottle, but I only use the 1:10 diluted calibration solution once, and I use the whole large volume for calibration. The reason for this is that they aren't like pH buffers, any drips of lower conductivity water will dilute the standard and change the microS reading.
The calculation is here: <"A simple continuous and fail-safe water-change system">.but a trip to your local hydro/pot shop you can buy a 300ml bottle of EC 1.413 / 706 calibration fluid for under a fiver.
I’ve got a HM Digital HMDCOM100 pen that I have been happy with so far. Allows calibration, does EC, TDS and temp. I use it to checks TDS of my tap water , RODI water and mix water for my tank.Hi all,
Can anyone please recommend a tds pen? I'm looking for something I can calibrate and test regularly, but a lot of the ones I'm seeing don't advertise that function (whether they have it or not).
Thanks!
Has anyone posted a guide on how, when and why to use a TDS Pen along with the benefits?
How would one go about avoiding that in a tap water scenario?For instance, you don't want to see your tanks TDS vary much in-between water changes. If you have build-up of fertilizers/minerals, a lot of decomposing organic waste, or leaching hardscape or a varying water source you're going to see a change - typically a spike. You want to avoid that.