How to Calibrate TDS Meter at home??

Описание: How to calibrate TDS METER AT HOME??

Proper Usage

• Immerse the meter in the water/solution up to the maximum immersion level (2”).
• Lightly tap or stir the meter to remove any air bubbles.
– Pockets of air between the electrodes may interfere with the electrical current. • Wait 10-20 seconds for the reading to stabilize.
– In hot (or ice cold) water, wait 20-30 seconds for the meter to compensate for temperature. As the water temperature will adjust to room temperature, the reading will change to accommodate the proper compensation.
• To ensure greater accuracy, turn the meter off and on for each reading.
• Shake any water off the meter after each use.
– This is to remove the droplets of water that may adhere to the surface between the sensors and the housing around them. These drops may interfere with readings.
• Rinse in de-ionized water or other filtered water after use to ensure proper readings.
• Rinse in alcohol or acid after use in high-TDS beverages.
• The meter is not waterproof: Do not drop or submerge the unit in water.
• Do not store the unit in high temperature.

TDS

Total Dissolved Solids correlates to the ability of water to conduct electricity. It is also an index used to determine the concentration of dissolved minerals. The more minerals that are dissolved, the more conductive the water will be. A TDS meter is calibrated to read in parts per million (PPM).
TDS is the concentration of a solution as the total weight of dissolved solids. (1 ppm = 1 milligram/litre. TDS is a mass estimate and is dependent upon the mix of nutrients as well as the concentration.

Conductivity

Electrical conductivity is a measure of the ability of a solution to carry a current and depends on the total concentration of ionized substances dissolved in the water. (the electricity flows by ion transport). Although all ions contribute to conductivity, their valences differ, so their actual and relative concentrations affect conductivity. When the concentration of ions is high, conductivity is high, and the resistance to electrical passage is low. No meters have the ability to distinguish between different types of ionic salts. Conductivity measurements are also complicated by the fact that not all salts conduct an electric current equally.

How the TDS meter works??

TDS meters are, in reality, conductivity meters. They work by applying a voltage between two or more electrodes. Positively charged ions w ill move toward the negatively charged electrode, and negatively charged ions will move toward the positively charged electrode. Because these ions are charged and moving, they constitute an electrical current. The meter then monitors how much current is passing between the electrodes as a gauge of how many ions are in solution. This measure of conductivity, μS/cm is then converted to ppm by a factor of approximately 0.5, on a curve ranging from 0.47 to 0.55, depending on the level. The factor is related directly to the level of conductivity. This meter is built and calibrated according to an NaCl standard. Other meters may be calibrated to either a KCl standard (0.51 conversion) or the 442 standard.(0.7 conversion)

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