When replacing the gauge on the high side of a refrigeration system, what is the minimum pressure graduation rate recommended?

The minimum pressure graduation rate recommended when replacing the gauge on the high side of a refrigeration system is based on ensuring accurate readings and safe operation within the system's working environment. A graduation rate of 1.2 times the design pressure is optimal because it provides sufficient resolution for monitoring the system's pressure variations while also accommodating potential pressure surges that may occur during operation.

This specific graduation rate allows technicians to detect small changes in pressure, which is crucial for maintaining the efficiency and safety of the refrigeration system. Gauges with lower graduation rates may not accurately reflect the system's pressure changes, potentially leading to misdiagnosis or oversight of issues that could affect system performance.

In this context, using a graduation rate of 1.2 times the design pressure ensures that the gauge is adequately responsive to the dynamics of the refrigeration system, while also taking into account the maximum pressures that the system may encounter during its operational cycle.