What is the maximum range for a 3 psi gauge with a 2" diameter?

The maximum range for a gauge is typically defined by its full scale pressure reading, which is determined by the construction and purpose of the gauge itself. In the context of a 3 psi gauge, the maximum reading that it is designed to display is 3 psi, but the actual maximum effective measuring range for operational safety and clarity might extend beyond this.

A 3 psi gauge of 2-inch diameter often has a design that allows for measurement and readability up to a larger value, which in this case would typically be around 5 psi. This provides a buffer for operational procedures and allows for a level of measurement that can account for minor fluctuations or spikes above the designated threshold without causing damage to the gauge.

The other choices, while they denote higher pressures, are not typical scales for a 3 psi gauge. Ranges such as 7 psi or 10 psi would be considered too high for a gauge originally rated at 3 psi, which could risk misreadings or mechanical failure. Therefore, a range extending to 5 psi is most appropriate for ensuring both safety and accuracy in readings without exceeding the design limitations of the gauge.