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What is instrument?
Device that communicates, denotes, detects, indicates, measures, observes, records, or signals a quantity or phenomenon, or controls or manipulates another device. An instrument is a device that measures a physical quantity such as flow, temperature, level, distance, angle, or pressure. Building Mechanical thermostat Security system Kitchen appliances use sensors for control. A refrigerator maintains a constant temperature by measuring the internal temperature. A microwave oven sometimes cooks via a heat-sense-heat-sense cycle until sensing done. An automatic ice machine makes ice until a limit switch is thrown. Pop-up bread toasters can operate by time or by heat measurements. Some ovens use a temperature probe to cook until a target internal food temperature is reached. A common toilet refills the water tank until a float closes the valve. The float is acting as a water level sensor. Automotive Anti-skid braking systems Airbag systems which contain sensors Autonomous cars Battery voltage and current Brake, headlights, transmission position). Check engine Cruise control affects throttle position. Distance traveled Door ajar Engine rotational speed Fluid levels Fluid temperatures Feedbacks of various controls (turn signals, parking Fuel low Logic and actuators Navigation systems OnStar system Seat belt unfastened) Tire pressure low Vehicle linear speed Aircraft Autopilots Aircraft stabilization systems Global positioning systems Weather radar Redundant sensors Laboratory instrumentation Instrumentation is used to measure many parameters (physical values). These parameters include: Pressure, either differential or static Flow Temperature Levels of liquids, etc. Density Viscosity Other mechanical properties of materials Properties of ionising radiation Frequency Current Voltage Inductance Capacitance Resistivity Chemical composition Chemical properties Properties of light Vibration Weight |