A sensor is a device that detects and responds to some type of input from the physical environment. The specific input may be light, heat, movement, humidity, pressure, or one of many other environmental phenomena. The result is typically a signal converted to a human-readable display at the sensor location or transmitted electronically over a network for further reading or processing. Say no to plagiarism. Get a tailor-made essay on “Why Violent Video Games Should Not Be Banned”? Get an original essay Some examples of the many types of sensors: In a mercury-based glass thermometer, the input is temperature. The contained liquid expands and contracts in response, causing the level to increase or decrease on the marked gauge, which is human readable. An oxygen sensor in a car's emissions control system detects the gasoline-to-oxygen ratio, usually through a chemical reaction that generates a voltage. A computer in the engine reads the voltage and, if the mixture is not optimal, readjusts the balance. Motion sensors in various systems, including home security lighting, automatic doors, and plumbing fixtures, typically send out some type of energy, such as microwaves, ultrasonic waves. or light beams and detect when the flow of energy is interrupted by something entering its path. A photosensor detects the presence of visible light, infrared (IR) transmission and/or ultraviolet (UV) energy. Principles of Water Sensor Operation Pipeline leak detection is used to determine if and in some cases where a leak has occurred in systems containing liquids and gases. Detection methods include hydrostatic testing, infrared and laser technologies after pipeline erection and leak detection during maintenance. Pipeline networks provide the most economical and safest mode of transportation for oil, gas and other fluid products. As a means of long-distance transportation, pipelines must meet high requirements for safety, reliability and efficiency. If properly maintained, pipelines can last indefinitely without leaks. The largest leaks that occur are caused by damage from nearby excavations. If a pipeline is not properly maintained, it can corrode, especially at construction joints, low spots where moisture accumulates, or places with imperfections in the pipe. However, these defects can be identified by inspection tools and corrected before they become a leak. Other reasons for leaks include accidents, earth movements or sabotage.Applications of Water SensorWater sensors find applications in nuclear power plants, automobiles to measure the amount of gasoline left in the fuel tank. fuel, engine oil, cooling water and brake/power steering fluid. . Industrial applications of water level sensors include water level detection in transportation and storage tanks and water treatment tanks. Keep in mind: this is just a sample. Get a personalized article from our expert writers now. Get Customized Test Manufacture different types of level instruments for their use in municipal areas and also in food and beverage industry.