What is the primary purpose of an OPD?

The primary purpose of an OPD, or Overfill Prevention Device, is to prevent overfilling of LP gas cylinders. This is crucial for safety, as overfilling can lead to dangerous situations such as cylinder rupture or gas leaks, potentially causing fire hazards or explosions. The OPD achieves this by allowing only a certain amount of liquid gas to enter the cylinder and then shutting off the flow before it can overflow.

In terms of the other options, enhancing filling accuracy, regulating gas pressure, and monitoring temperature changes, while important in their own contexts, do not specifically address the primary function of the OPD. The device is specifically designed with the goal of preventing overfilling, making it vital for safe handling and storage of LP gas. Understanding the OPD's role helps ensure that safety standards are met during the refilling process, thereby protecting both the users and their surroundings from potential hazards.