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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.
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