What is the calibration increment for a gauge measuring 3 psig?

The calibration increment for a gauge measuring pressure is essential because it determines the smallest degree of pressure that can be reliably measured and indicates the resolution and accuracy of the gauge. In this case, for a gauge measuring up to 3 psig, the choice of a 1/10" increment is appropriate.

This increment allows for sufficient accuracy in readings at lower pressures, such as those found in typical high-pressure boiler operations. A 1/10" calibration increment means that the gauge can display pressure differences of 0.1 psig, which is suitable for ensuring proper monitoring and safety in boiler systems. More precise increments, like 1/20" or smaller, may not be necessary at this lower pressure range and could complicate readings without offering significant added value for practical applications.

Choosing a smaller increment, like 1/50", could lead to unnecessary complexity and increased cost without a corresponding benefit in precision for most operational requirements at 3 psig. Therefore, 1/10" strikes a balance between accuracy and practicality for measuring pressures in this context.