The above figure shows a multitube manometer with atmospheric reference. Up to 50 tubes can be packaged in a common bank; thus, the same number of process pressures can be detected from the same reference well. If desired, some or all the tubes can be provided with separate wells for flexibility.
The accuracy of measurement is largely a function of the operator’s ability to precisely read the height of the liquid column. For this reason, designs have been developed that tend to amplify the reading using vernier scales, magnifying eyepieces, or other techniques.
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Instrumentation Basics 