Collecting and sending information about a measured variables

     Examples includr pressure sensors (such as bellows,daiphragms,manometers,anf bourdon tubes), temlerature sensors(such as, thermometers, thermal bulbs,thermocouples,thermiistors, and resistance themperature dectectors, level sensors(such as orifice plate and venturi tubes when used eith a differential pressure sensors,and royameters.)

Displaying and/or recording information about a measured variable.

     Instruments that display information include thermostats,speedometers

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APPLICATIONS OF INSTRUMENTATION

Information of instrumentation


     The thermometers, barometers, and anemometers are used by government weather services to analyze the envirnmont. Similarly, water,gas,and electric meters are used to keep track of the consumption and cost of such commodities. Closer to the subject og this book, sensors are used to monitor and record important variable in a process.



     The other and extremrly important application of sensors is that in which theunstrument servesas a comlonent of an automatic control system. The role of the sensors in an  automatic control system  is clearly seen the  traditional block diagram.


     →→ →→  CONTROLLER----------↓

                                                             
  SENSORS                 CONTROLLER                                                   DEVICE
            ↑                                     ↓
            ↑                                     ↓
                                                 ₩₩₩₩ MEASURMENT  
                      PROCESS         EFFECT ON                                                  PROCESS

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