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Title: The Search For The Ultimate Bellows Meter The First 100 Years
Author: H. S. Biles
Source: 1967 Gulf Coast Measurement Short Course (Now called ASGMT)
Year Published: 1967
Abstract: For well over 100 years, instrument engineers have worked with the metallic bellows searching for the ideal mechanism for measurement of differential pressure. It appears to offer a simple answer to this complex problem: actually, it is disarmingly simple. In practice, it presents challenges, troubles and booby traps of truly formidable dimensions. Generally, a bellows appears to be something like a leak-proof, friction-free piston with a fixed spring rate. With care in fabrication, it has been possible, probably since the first bellows was made, to meet the leak-free assumption. For the other 2 factors, however, it has taken generations of advancement in metallurgy and mechanical design to come anywhere near meeting the concept of friction-free and the spring rate is still not truly constant.

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