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น้ำดื่มที่ได้มาตรฐานควรมีค่า TDS ไม่เกิน 500 ppm
Conductivity/TDS
Electrical Conductivity sensors are used to measure the ability of water to carry an electrical current. Absolutely pure water is a poor conductor of electricity. Water shows significant conductivity when dissolved salts are present. Over most ranges, the amount of conductivity is directly proportional to the amount of salts dissolved in the water.
The amount of mineral and salt impurities in the water is called total dissolved solids (TDS). TDS is measured in parts per million. TDS tell how many units of impurities there are for one million units of water. For example, drinking water should be less than 500 ppm,
http://www.stevenswater.com/water_quality_sensors/conductivity_info.html
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TinyNu
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12 เม.ย. 55 09:07:00
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