Lesson 1 - Principles of Pressure in Liquids and Gases
Properties of matter; Units of pressure; Density; Specific gravity, Gauge, absolute, and atmospheric pressure; Pressure and flow
Learning Objectives:– Compare the three forms of matter.
– Define pressure and explain the difference between gauge pressure and absolute pressure.
– Discuss the conditions that affect the pressure of a liquid.
– Describe how changes in volume affect the pressure of a gas at a constant temperature.
– Describe how changes in temperature affect the volume of a gas at constant pressure, and the pressure of a gas with a constant volume.
– Discuss the two causes of pressure drop in a pipe carrying liquid from a tank.
Lesson 2 - Pressure Sensors
Manometers; Bourdon tubes; Diaphragm sensor construction and capsule elements; Bellows sensors; Maintaining accuracy; Calibration
Learning Objectives:– Explain how a manometer works.
– Describe four kinds of bourdon-tube sensors.
– Discuss construction details of bourdon tubes, diaphragms, and bellows.
– Explain how bellows pressure sensors work.
– Describe how calibration may be accomplished and list the steps in calibrating a pressure gauge.
– Explain how normally open and normally closed pressure switches work.
Lesson 3 - Pressure Transducers
Pressure conversion; Potentiometric pressure transducers; P/I, P/P, reluctive, servo, strain-gauge, and piezoelectric transducers; Response
Learning Objectives:– Discuss the advantages and disadvantages of the potentiometric pressure transducer.
– Explain how a P/I transducer works.
– Describe the operation of capacitive, reluctive, and servo pressure transducers.
– Compare the three kinds of strain gauge pressure transducers.
– Describe the operation and advantages of the piezoelectric pressure transducer.
– Discuss three environmental conditions that can affect transducer operation.
Lesson 4 - Low-Pressure Measurement
Low pressure; Methods of conversion; sP transmitters, Pressure, slack-diaphragm, ionization - McLeod, thermal conductivity, Pirani, and thermocouple gauges
Learning Objectives:– Define the pressure unit torr and calculate pressure in specified units when given the pressure in other units.
– Explain the operation of a differential-pressure transmitter and a slack-diaphragm gauge.
– Name two kinds of ionization gauges and describe how they work.
– Explain how the McLeod gauge works.
– Describe the capacitance manometer.
– Compare the operation of the Pirani gauge and the thermocouple gauge.
Lesson 5 - Installation and Service
Pressure transmitter components; Piping, connections, and fittings; Wiring; Guidelines for periodic maintenance; Calibration; Safety
Learning Objectives:– List the components of a pressure-transmitter installation.
– Compare methods of joining pipes and other instrumentation components.
– Describe the procedure for placing a pressure instrument into service.
– Discuss the elements of periodic maintenance.
– Explain how to calibrate pressure instruments with electrical and pneumatic outputs.
– Describe three important techniques used in troubleshooting and repair.
– List five important safety rules.