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When you have read our section on Input Devices, we hope you will be able to:
- Explain the term sensor.
- Explain the term transducer.
- Explain the operation of three types of temperature sensors: thermocouples, RTDs, and thermistors.
- Describe two applications for temperature sensors.
- Explain the operation of three types of pressure sensors: Bourdon tube, strain gauge, and piezoelectric.
- Describe two applications for pressure sensors.
- Explain the operation of three types of flow sensors: paddlewheel, pitot tube, and orifice plate.
- Describe two applications for flow sensors.
- Explain the operation of three types of level sensors: capacitive, sonic, and Δ P.
- Describe two applications for level sensors.
- Explain the operation of four types of position sensors: LVDTs, rotary and linear encoders, resolvers, and proximity switches.
- Describe two applications for position sensors.
- Use sketches to explain the operation of ball screw mechanisms and rack-and-pinion assembly used to change rotary motion into linear motion, and how linear motion can be turned into rotary motion.
- Explain the operation of pH sensors, density sensors, and gas detectors.
- Explain why an engineer or technician must understand the theory of operation of a sensor as well as the electronic signal that comes from the sensor.
- Explain the operation of a Hall effect and explain applications where it can be used.
- Calculate flow, temperature, level, and pressure.
- Explain why the 4-20 mA and 0-10 volt signals are the most frequently used signals from sensors and transducers.
- Explain how one may troubleshoot various sensors and transducers.
