BURKERT Conductivity Sensor 426872 Quality Assurance

BURKERT Conductivity Sensor 426872 Quality Assurance

Shanghai Pumin Industrial Automation Equipment Co., Ltd. specializes in the sales of imported spare parts from Europe and America. The company has its own offices in Germany and the United States, where manufacturers purchase directly from first-hand sources and prices are more advantageous in the market.

Price advantage: We directly obtain quotes from factories, avoiding many intermediate links. Many factories offer us fixed discounts to ensure that we provide customers with favorable prices.

Wide channels: In addition to factories, we have direct business relationships with many distributors in Europe, which allows us to purchase brands that cannot be quoted due to protecting agents.

Measurement sensors

Conductivity sensors are industrial instruments used to measure the conductivity or ion concentration of solutions, mainly applied in fields such as water quality monitoring, chemical production, biopharmaceuticals, and environmental detection. They can cover full scene measurements from ultrapure water to wastewater. Its working principle can be divided into electrode type, inductance type, and ultrasonic type: the electrode type is achieved through resistance measurement method, including two electrode and four electrode structure design, the latter adopts coaxial layout to reduce polarization error; Inductive type is based on the principle of electromagnetic induction and is suitable for high conductivity environments; Ultrasonic type uses changes in sound waves for non-contact detection. Sensors are usually made of corrosion-resistant materials such as 316L stainless steel and titanium alloy, and support high-temperature steam sterilization and various installation methods (flow type, sinking type, etc.).

Mainstream products have built-in temperature compensation modules, with a measurement range spanning from 0.01 μ S/cm to 2000mS/cm, an accuracy of ± 0.5%, and a protection level of IP68. The four electrode model improves measurement stability and covers a wider range through independent current and voltage detection electrodes. Some sensors integrate corrosion diagnosis function, which can synchronously monitor equipment losses through a dual ended electrode structure. The calibration adopts the DRY-CAL method and requires regular cleaning of the electrodes with acid solution to maintain accuracy. This device plays a key role in semiconductor ultrapure water detection, industrial process monitoring, and medical electrolyte analysis.

BURKERT Conductivity Sensor 426872 Quality Assurance

working principle

The working principle of conductivity sensors is based on Ohm's law. When a constant alternating voltage is applied across the electrodes, a current is generated in the solution. Ions in a solution move directionally under the action of an electric field, forming an electric current. According to Ohm's law (I=V/R), the conductivity of a solution can be calculated by measuring the magnitude of the current and combining it with the known electrode spacing (distance) and cross-sectional area (electrode area). The conductivity of a solution is related to the type, concentration, and temperature of the ions it contains.

Due to the increase in conductivity of the solution with temperature, temperature compensation is required during measurement. Sensors usually have built-in temperature sensors (such as Pt1000 thermistors) to measure solution temperature in real time, and use calibration coefficients to convert the measured value at the current temperature to the conductivity value at a standard reference temperature (such as 25 ℃) to ensure accurate results. The temperature compensation methods include linear compensation and nonlinear compensation.

Conductivity sensors can be divided into electrode type conductivity sensors, inductive type conductivity sensors, and ultrasonic conductivity sensors based on different measurement principles and methods.

Electrode sensors are mainly divided into two electrode and four electrode types based on the number of electrodes and working principle. The two electrode sensor consists of a pair of electrodes with a simple structure, but it is susceptible to electrode polarization effects in high conductivity solutions and has limited measurement accuracy in ultra pure water. The four electrode sensor uses two pairs of coaxial current electrodes and voltage electrodes to apply AC signals to the current electrodes and measure the potential difference between the voltage electrodes. Due to the separation of the excitation electrode and the measurement electrode, polarization effects are effectively avoided, improving measurement accuracy and stability in high conductivity solutions.

Inductive (also known as electromagnetic induction or electrodeless) sensors operate based on the principle of electromagnetic induction. It contains two closely adjacent coils (transmitting coil and receiving coil) inside, encapsulated in a corrosion-resistant polymer (such as PEEK, PFA) shell. The transmitting coil is fed with alternating current to generate an alternating magnetic field, which induces eddy currents in the surrounding conductive solution. The intensity of these eddy currents is proportional to the conductivity of the solution, and is then detected by the receiving coil. Due to the fact that the sensor does not come into direct contact with the solution, it avoids issues such as electrode contamination and polarization, making it particularly suitable for measuring solutions with high conductivity, corrosiveness, or suspended solids.

With the development of Micro Electro Mechanical Systems (MEMS) technology, MEMS four electrode conductivity sensors based on laser drilling and back lead technology have emerged. This technology optimizes the electric field constrained four electrode structure to achieve packaging with "front perforation and back lead", improving the measurement performance, environmental adaptability, and integration convenience of the sensor.

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