Question: a) Explain the term sensor. b) Describe an application that uses magnetic field sensors. c) A chemical process only works correctly if the temperature is

a) Explain the term sensor.

b) Describe an application that uses magnetic field sensors.

c) A chemical process only works correctly if the temperature is above 70 °C and the pH is below 3.5. Sensors are used as part of the control process. A heating element is used to heat the reaction if necessary and valves are opened or closed to add acid to maintain the reaction pH.

Describe how sensors, actuators and a microprocessor are used to control the conditions in this chemical process.

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