Describe the principle of various pressure measuring instruments used in energy audit process.

Pressure measuring instruments are commonly used in energy audit processes to determine the efficiency of HVAC systems, steam systems, and other mechanical systems that rely on the transfer of fluids or gases. These instruments measure pressure, which is the force per unit area exerted by a fluid or gas on the walls of its container. There are several types of pressure measuring instruments that can be used in energy audits, each of which works on different principles.

1. Bourdon Tube Pressure Gauge

Bourdon tube pressure gauges are among the most common types of pressure measuring instruments used in energy audits. They work on the principle of elastic deformation, ______ ____ ___ __________ _____ __________ _____ ___ ______ ______ _________.
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