What is the minimum face size of a non-mercury gauge?

The minimum face size of a non-mercury gauge is indeed 2-1/4 inches. This size specification helps ensure that readings can be taken accurately and easily from a safe distance, allowing operators to clearly see the pressure indications without the risks inherently associated with smaller gauges. The design of pressure gauges, particularly in high-pressure boiler applications, emphasizes visibility for safe operation and timely decision-making.

This minimum size is consistent with industry standards aimed at enhancing operator safety and reducing the likelihood of errors due to misreadings. A gauge that is too small may impair a user’s ability to read it accurately, which is critical in high-pressure environments where safety is paramount. The 2-1/4 inch measurement strikes a balance between size and functionality while adhering to established guidelines for non-mercury devices used in boiler operations.