What should an overfilling prevention device comply with to ensure proper filling of a cylinder?

An overfilling prevention device is crucial for safely filling propane cylinders, ensuring that they do not exceed the maximum allowable filling limit. This device is designed to provide a safety mechanism that alerts the operator when the cylinder has reached a predetermined level, thus preventing overfilling, which could lead to dangerous situations such as excessive pressure buildup or leakage.

The statement that the device shall not be the primary means to determine when a cylinder is filled to the maximum allowable filling limit aligns with industry standards and safety protocols. Instead, the device is intended to be a supplementary safety feature that works in conjunction with other filling methods, such as weight measurement or visual inspections. Operating under the assumption that this device should not be solely relied upon helps ensure that multiple checks are in place to maintain safety during filling operations.

This understanding reinforces the importance of using comprehensive filling practices, as relying entirely on one device could lead to potential hazards if the device were to fail or malfunction. As such, it's integral to combine various methods of monitoring for safe propane handling and operation.