SENSOR A sensor is a device that detects manifestations of qualities or physical or chemical phenomena, called instrumentation variables such as temperature, light intensity, distance, acceleration, inclination, displacement, pressure, force, torque, humidity, pH, etc. and convert these physical or chemical phenomena in a change in any of the following variables, for example, electrical resistance (such as a RTD), electrical capacity (as a humidity sensor), tension power (such as a thermocouple), electricity (such as a phototransistor, etc.). The difference of one sensor with respect to a transducer, is that sensor is always in contact with or controlar.Recordando variable measuring the signal that gives us not only the sensor used to measure the variable, but also to make electronic circuits using a standard signal (4 to 20 mA, or 1 to 5VDC) to have a linear relationship with changes in the sensed variable within a range (span), for control of that variable in a process.
can also say that is a device that uses one of its properties to adapt the timing signal so that you can play another device. Such as mercury thermometer takes the property owned by the mercury to expand or contract by the action of temperature.
Many sensors are electrical or electronic, although other types. A sensor is a type of transducer that converts the amount to be measured or controlled, in another, for easy measurement. Indication may be direct (eg a mercury thermometer) or may be connected to an indicator (possibly through an analog to digital converter, a computer and a display) so that the detected values \u200b\u200bcan be read by a human.
Along with electronic sensors, one of the most important due to their fields of application are the chemical sensors. These have been used successfully in the environment, medicine, industriales.etc processes.
