Conductivity Meter, Description:
Conductivity Meter working Principle- In this article, you will learn the very basics of conductivity meter, everything will be explained with the help you images.
Do you know what Conductivity is?
Conductivity can be defined as the ability of a Solution to conduct electrical current. Ions in solution (dissolved salts or acids) carry electrical current. Ions that have lost electrons are charged positively, and ions that have gained electrons are charged negatively. The more particles in a solution, and the more electrons being moved, the more conductive a solution is. So a Conductivity Meter is used to measure the volume of dissolved solids in a solution.
I have been working on conductivity meters for measuring the water quality e.g Ph Sensor, TDS Sensor, Turbidity Sensor etc. I used some of these with the Arduino, ESP8266, and ESP32. I am going to share links with you, if you want to take a look.
The precise measurement of connectivity is often difficult in applications that require a wide measuring range. Thanks to its four electrodes Memosens CLS82D reaches maximum accuracy even in these applications.
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Basically the electrical conductivity of liquids can be determined using the two electrodes or four electrodes conductive measuring principle or the inductive measuring principle.
The two electrode conductive principle has a high measuring sensitivity that makes it suitable for media with low conductivities from ultrapure water to drinking water. The inductive conductivity measurement is suited for media with a high conductivity such as Brine, Acids, and Bases. For applications that require a wide measuring range such as phase separation fermentation or chromatography the four electrode conductivity measurement is the most suitable.
This method is based on the conductive measuring principle where two electrodes are positioned opposite from each other an AC voltage is applied to the electrodes which generates a current in the medium the cations move to the negatively charged electrode while the anions move to the positively charged electrode. The more free charged carriers the liquid contains the higher the electrical conductivity and the current flow if however the ion concentration becomes too high this leads to a mutual repulsion of the ions and thus a reduction of the current this effect is called polarization.
To compensate the polarization effect the 4 electrodes measurement uses two additional electrodes that serve as passive observers.
These current less electrodes measure the potential difference in the medium which depends on the conductivity. The connected transmitter uses the measured potential difference and the given current to calculate the conductance and finally the electrical conductivity.
Endress + Hauser’s Memosens CLS82D conductivity sensor features four electrodes so is perfectly suited for wide measuring ranges. The sensor also meets the highest demands of hygienic design. Its sensor element consists of a ceramic body and platinum electrodes. The combination of these two materials makes the sensor perfect for applications with extreme temperature fluctuations. Ceramics and platinum have an almost identical expansion coefficient so that no gaps will occur and no product can deposit even with extreme temperature variations. This guarantees maximum cleanability and even a septic hygiene, when it comes to safety requirement.
Memosens CLS82D Conductivity meter is very convincing with its unique electrode connection surveillance. If the connection between the platinum electrodes in the sensor element and the memo sense electronics in the sensor head ever breaks the surveillance function generates a specific error message.
This function further enhances the comprehensive measuring point monitoring offered by the Memosense technology. Customers can completely rely on the digital signal transmission and react immediately if an error should occur they can be sure that their processes and products are safe.
For Video tutorials, visit my YouTube Channel “Electronic Clinic”.