TDS Sensor/ Conductivity Sensor / Conductivity cell
Technical Specifications :
Range : 000 TO 9999 MCM
Resolution : 1 mcm
Tolerence : +/- 1%
Output : sine wave
Operating Voltage : 5 VDC
Size : 16* 110
Body : PP/ABS
TDS Sensor | Conductivity Cell
The electrical conductivity sensor (EC sensor) measures the E.C in a solution. Which usually used for aquaculture and water quality testing. Electrical Conductivity Sensor is specially designed for a low-cost system. While a relatively high accuracy that can cover most applications. Hence it easy to use and very suitable for Arduino and Raspberry Pi projects.
What is TDS?
The PPM (Particle per Million) TDS value (Total Dissolved Solids) gives the sum of total dissolved solids in water. These solids may be salts, minerals, and metals. Mostly Sodium and magnesium salt fond dissolved. TDS measred in PPM.
Conductivity Means: The conductivity of the water or any solid/liquid measured indicates ions are in the water, the better it conducts electricity. TDS meters typically quantify this conductivity in micro siemens UCM or MCM. The latter stands for parts per million i.e. the number of solid particles per one million water mixture particles. Hence value of 40 ppm means that from one million particles 40 dissolved ions and the rest (= 999 960) are water molecules.
What does it mean about the water quality?
DM water with a ppm value of zero, is automatically free from any pesticides and drug residues, is far from it. All the TDS meter measures are merely the number of ions in the water. Most of the pesticides, hormone-disturbing substances, and drug residues are usually no ions!
In short: water with a low ppm value is virtually free from salts and minerals, but can hide a large cocktail of non-ionic chemicals in itself. While the result of a TDS meter therefore not very meaningful with regard to the actual water quality. While Other analytical methods or a water analysis by a reputable laboratory may be better suited to find out about the actual water quality.
Observation as analyst
While you want to check the functionality of an osmosis system. Hence the mere TDS values not suitable as an indicator of the water quality. Because water analyzes often very expensive and only reflect a snapshot. Hence they are only advisable if the drinking water is to be tested for all substances. It often makes more sense to invest in a high-quality water filter right away. This way you have more security with your daily drinking water in the long term. However, it is essential to pay attention to appropriate assessments and long-term studies! Because the label “filters pesticides” can also mean, with an inferior filter, that only 5% of the pesticides are removed, or the retention rate drops rapidly after a short time.