What is the minimum dial arc on a 2-1/4" gauge?

The minimum dial arc on a 2-1/4" gauge is indeed 270 degrees. This measurement is important for ensuring that the gauge provides a clear and readable indication of the pressure or temperature ranges the equipment is operating within.

A gauge with a 270-degree arc allows for a broader range of measurement and provides more detail than a smaller arc, which can enhance the accuracy of reading the gauge. Typically, such gauges are designed to avoid areas where the reading would be less optimal and to ensure that the critical ranges are clearly displayed.

This arc accommodates the various industrial applications where precision is vital, especially in contexts like high-pressure boiler operation where monitoring is crucial for safe and efficient performance. A 270-degree arc also allows for placing the scale markings effectively around the dial, ensuring users can read the gauge easily at common viewing angles.

In summary, the answer reflects standard design practices for pressure gauges in high-pressure environments, contributing to their functionality and safety.