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Pneumatic and Hydraulic Test Devices

Pneumatic and Hydraulic Test Devices

Prerequisites:  This lesson is designed for participants familiar with process control instruments. An understanding of basic algebra is also recommended.

Description:  This lesson presents operating principles and procedures for using a variety of test devices including manometers, test gages, portable pneumatic and hydraulic calibrators, and pneumatic and hydraulic deadweight testers. Selection of the appropriate test device for a particular instrument calibration is also discussed.


  • Identify the facility's primary and secondary standard pneumatic test equipment.
  • Identify the pressure reading of a liquid in a manometer and type manometer to use.
  • Recognize and identify the factors that affect accuracy of manometers.
  • Read the pressure on a u-tube manometer.
  • Determine the type of pressure being measured when given a u-tube connected to a vacuum source.
  • Adjust the manometer scale to zero.
  • Identify the point on the manometer that should be connected to a pressure source to measure positive pressure.
  • Determine which test gage should be used for an instrument having high and/or low pressure range.
  • Identify the required accuracy of the test gage when given the accuracy rating of both the instrument and test gage.
  • Identify the correct setting of the regulators and selector valve on a pneumatic calibrator to prepare for testing.
  • Identify the correct type of calibrator for testing high or low pressures.
  • Identify the means by which the balance point on the deadweight tester is achieved.
  • Identify the factors that can affect the accuracy of hydraulic and pneumatic deadweight testers.
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