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Title: Digital Manometers For Field Calibration
Author: Leor Lombardo
Source: 1997 Western Gas Measurement Short Course
Year Published: 1997
Abstract: What is an inch of water? The correct answer to this question has talen on increased importance with the demand for better accuracy and the introduction of digital pressure indicators. For example lets assume that you have just received your new digital pressure indicator and you decide to verify its accuracy. The manufacturer claims 0.1% accuracy at 100 inches of water. You set up a test using a deadweight tester and a water manometer After placing a 100 inch of water weight on the deadweight tester, you record a reading of 99.8 inches of water on the digital pressure indicator and 100.2 inches of water on the manometer. Which is right? The answer to this question will be evident after the following discussion of manometers and dead weight testers and their relationship to digital pressure indicators. I will also include discussion of accuracy and resolution as it applies to digital pressure indicators.

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