Conductivity to TDS Conversion

The TDS to Conductivity correlation is non-linear and no single multiplier can determine the relationship. Therefore, a simple conversion table has been established to help you determine an approximate conversion factor.

Different types of salt have a different conductance value. The table below shows the three standard salts types. To simplify this conversion, Myron L has developed Conductivity/TDS meters that allow you to select the different salt types and does the conversion for you automatically. Take a look at the Ultrameter II 4P or the Techpro II TP1.

Conductivity at 25 °C	TDS KCI		TDS NaCI		TDS 442
	ppm Value	Factor	ppm Value	Factor	ppm Value	Factor
84 µS	40.38	0.5048	38.04	0.4755	50.50	0.6563
447 µS	225.6	0.5047	215.5	0.4822	300.0	0.6712
1413 µS	744.7	0.5270	702.1	0.4969	1000	0.7078
1500 µS	757.1	0.5047	737.1	0.4914	1050	0.7000
8974 µS	5101	0.5685	4487	0.5000	7608	0.8478
12,880 µS	7447	0.5782	7230	0.5613	11,367	0.8825
15,000 µS	8759	0.5839	8532	0.5688	13,455	0.8970
80 ms	52,168	0.6521	48,384	0.6048	79,688	0.9961

TDS 442 – This solution best represents natural freshwater. The Myron L Company developed the 442 standard nearly 50 years ago. It is still the world’s most accepted standard.

TDS NACL – This sodium chloride solution best represents seawater, brackish water, or other high saline solution.

KCL TDS – This potassium chloride solution is a very stable salt and is an international calibration standard for conductivity measurements.

All of these different solution types are available here at an affordable price.

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1. Testing Fountain Solution Conductivity - Color Printing Forum says:

   May 5, 2011 at 11:46 am

   [...] the number of total dissolved solids in the water based on salt type. Link to Conversion Article: http://blog.myronlmeters.com/archives/5 We have Myron L meters available that measure in micromhos. You can select the one that measures [...]

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2. MyronLMeters Joins Color Printing Forum Discussion « myronlmeters says:

   May 5, 2011 at 11:53 am

   [...] Link to Conversion Article: http://blog.myronlmeters.com/archives/5 [...]

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3. PH & Conductivity meter - Color Printing Forum says:

   May 5, 2011 at 12:32 pm

   [...] does not only refer to calcium carbonate. You can take a look at this article to see what I mean: Conductivity to TDS conversion Different minerals have a different conductance value. Again, just to clarify… Hope that [...]

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