How To Calibrate Conductivity and TDS – DS Meter

Posted by 30 Dec, 2010

TweetMyronLMeters.com will keep you up-to-date with the latest product and industry videos, as well as the most accurate, reliable, easy-to-use water quality testing meters. Please visit us on the web at: http://www.myronlmeters.com Facebook: http://www.facebook.com/pages/Myron-L-Meters/147455608645777 Google +: https://plus.google.com/112342237119950323462 Twitter: http://twitter.com/MyronLMeters Linkedin: http://www.linkedin.com/profile/view?id=98473409&trk=tab_pro News: http://waterindustrynews.com

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MyronLMeters.com will keep you up-to-date with the latest product and industry videos, as well as the most accurate, reliable, easy-to-use water quality testing meters.

Please visit us on the web at:
http://www.myronlmeters.com

Facebook: http://www.facebook.com/pages/Myron-L-Meters/147455608645777

Google +: https://plus.google.com/112342237119950323462
Twitter: http://twitter.com/MyronLMeters

Linkedin: http://www.linkedin.com/profile/view?id=98473409&trk=tab_pro

News: http://waterindustrynews.com

Categories : Videos

How Water Quality Affects Greenhouse Crops

Posted by 28 Dec, 2010

Tweet If you are a greenhouse grower then you are most likely familiar with the importance of proper water quality for your crops. Water quality can easily be determined by taking measurements periodically. It is important to use accurate and reliable equipment to perform the measurements. A wide selection of high quality conductivity testers and […]

greenhouse drip

If you are a greenhouse grower then you are most likely familiar with the importance of proper water quality for your crops. Water quality can easily be determined by taking measurements periodically. It is important to use accurate and reliable equipment to perform the measurements. A wide selection of high quality conductivity testers and hydroponic pH testers can be found here at an affordable price.

To determine the suitability of water for irrigation you can easily take measurements of the Electrical Conductivity (EC) and the Sodium Adsorption Ratio (SAR). In general, the higher the EC and SAR, the less suitable the water is for irrigation. Irrigation using water with high sodium adsorption ratio may require soil amendments to prevent long-term damage to the soil.

SAR measurements are provided with laboratory analysis of the water. However, EC measurements can be made using a portable EC meter. The Myron L AG6/pH was specifically designed as a pH and conductivity tester for greenhouse crops.

As a rule of thumb, the water is considered borderline and its use can present problems if conductivity values are higher than 0.8 millisiemens/cm (mS) and SAR is over 4. If the conductivity measurement is below 0.8 mS and the SAR measurement is below 4, the water is suitable for greenhouse irrigation. Particular management practices should be used when water is outside the acceptable limits. This might include using a growing medium with excellent drainage, leaching with every watering and compensating the sodium with calcium and magnesium.

If galvanized steel is used throughout the greenhouse and water is reclaimed for irrigation, it is a good idea to check the amount of Zinc in the water and make nutrient correction accordingly.

Many greenhouses use drip irrigation systems, which are efficient and low maintenance, but nozzles can become clogged by hard water. Check for high levels of bicarbonates (above 100 ppm) in the water and neutralize with the appropriate acids.

There are many factors that affect water quality and greenhouse crop growth. Consult your fertilizer manufacturer for recommendations on proper nutrient levels.

Categories : Application Advice, Technical Tips

Conductivity to TDS Conversion

Posted by 28 Dec, 2010

TweetThe 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 […]

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.

Categories : Application Advice, Technical Tips