What is the required minimum connection size for a system pressure gauge in sprinkler systems?

The required minimum connection size for a system pressure gauge in sprinkler systems is 1/4". This size is established to ensure accurate readings of the system's pressure, which is crucial for the functionality and reliability of the sprinkler system. A 1/4" connection is small enough to allow for detailed pressure measurements while still being substantial enough to handle the necessary flow without causing excessive pressure drop or lag in response time.

Using a gauge connection that is too large might not effectively reflect the pressure changes in the system, especially when rapid fluctuations occur. Conversely, connections that are too small could restrict flow, potentially leading to inaccuracies. Therefore, a 1/4" connection is the optimal size to maintain a balance between sensitivity and robustness in monitoring the pressure within a sprinkler system.