They measure the change in capacitance between two plates produced by changes in level.
Tank level sensor.
Fpi sensors offers a wide range of level sensors that can be used in a variety of different industrial processes.
Your source for liquid level sensors and controllers.
Non contact nothing touches the liquid.
Depending on an array of different factors you might select different types of level sensors.
Gikfun m8 32mm liquid level sensor fish tank water float switch pp plastic ball float controller diy kit for arduino ek1373x3 4 3 out of 5 stars 18.
They can be used to measure liquids and fluids as well as granular materials and fluidized solids and powders this is something fpi does not offer.
Madison m8700 plastic side mounted liquid level float switch with polypropylene stem 30 va spst 1 2 x 1 2 npt male 100 psig pressure.
Senix non contact toughsonic ultrasonic sensors offer cost effective continuous level measurement for small and large tanks.
Capacitance level sensors operate in the way that process fluids have dielectric constants significantly different to air.
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Level sensors for tanks.