Chemical Level Sensor Basics
Chemical level sensors are equipment used to measure the concentration of a liquid or gas in a container. They work by utilising various liquid or gas physical properties such as density, conductivity, or buoyancy.
Chemical level sensors are available in a variety of configurations, including:
-Float sensors: These sensors employ a float that adjusts its height in response to changes in liquid or gas level. Based on the location of the float, the level of the liquid or gas is computed.
-Ultrasonic sensors: These sensors use ultrasonic waves to determine the distance to the surface of a liquid or gas.
-Capacitance sensors: These sensors measure the variation in capacitance between two electrodes to determine the level of a liquid or gas.
-Resistive sensors: These sensors detect the variation in resistance between two electrodes to determine the amount of a liquid or gas.
-Radar sensors: These devices use radar waves to assess the distance to the surface of a liquid or gas.
-Optical sensors: These sensors use a light source and a detector to determine the level of a liquid or gas.
Depending on the application and the liquid or gas being monitored, chemical level sensors can be manufactured of a variety of materials. Typical materials include:
PVC (polyvinyl chloride) is a lightweight, low-cost polymer that is resistant to corrosion and chemicals. It’s commonly used in capacitance and float sensors.
-PP (polypropylene): Polypropylene (PP) is a chemically resistant, lightweight polymer that is widely used in resistive and ultrasonic sensors.
-PVDF (polyvinylidene fluoride): PVDF, a high-temperature, chemical-resistant polymer, is commonly used in radar and optical sensors.
Stainless steel, a strong and corrosion-resistant material, is commonly used in ultrasonic and resistive sensors.
Overall, the chemical properties of the liquid or gas being measured, as well as the environment in which the sensor will be used, influence the material selection for chemical level sensors.
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