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2. Level sensor - Wikipedia

   en.wikipedia.org/wiki/Level_sensor

   Ultrasonic level sensor used in a water treatment plant Ultrasonic level sensors are used for non-contact level sensing of highly viscous liquids, as well as bulk solids. They are also widely used in water treatment applications for pump control and open channel flow measurement.

3. Float (liquid level) - Wikipedia

   en.wikipedia.org/wiki/Float_(liquid_level)

   Liquid level floats, also known as float balls, are spherical, cylindrical, oblong or similarly shaped objects, made from either rigid or flexible material, that are buoyant in water and other liquids. They are non-electrical hardware frequently used as visual sight-indicators for surface demarcation and level measurement. They may also be ...

4. Ultrasonic transducer - Wikipedia

   en.wikipedia.org/wiki/Ultrasonic_transducer

   An ultrasonic transducer is affixed to a stainless steel pan which is filled with a solvent (frequently water or isopropanol). An electrical square wave feeds the transducer, creating sound in the solvent strong enough to cause cavitation. Ultrasonic technology has been used for multiple cleaning purposes.

5. Ultrasonic flow meter - Wikipedia

   en.wikipedia.org/wiki/Ultrasonic_flow_meter

   Schematic view of a flow sensor. An ultrasonic flow meter is a type of flow meter that measures the velocity of a fluid with ultrasound to calculate volume flow. Using ultrasonic transducers, the flow meter can measure the average velocity along the path of an emitted beam of ultrasound, by averaging the difference in measured transit time between the pulses of ultrasound propagating into and ...

6. List of sensors - Wikipedia

   en.wikipedia.org/wiki/List_of_sensors

   Liquid capacitive inclinometers; Odometer; Photoelectric sensor; Piezoelectric accelerometer; Position sensor; Position sensitive device; Angular rate sensor; Rotary encoder; Rotary variable differential transformer; Selsyn; Shock detector; Shock data logger; Sudden Motion Sensor; Tilt sensor; Tachometer; Ultrasonic thickness gauge; Ultra ...

7. Stream gauge - Wikipedia

   en.wikipedia.org/wiki/Stream_gauge

   Water pressure measuring device (Bubbler) - to measure water level via pressure (typically done directly in-stream without a stilling well) Stage encoder - a potentiometer with a wheel and pulley system connected to a float in a stilling well to provide an electronic reading of the water level; Simple ultrasonic devices - to measure water level ...