What is the purpose of using a sulphur candle in refrigeration systems?

The use of a sulphur candle in refrigeration systems is specifically aimed at detecting gas leaks. When lit, the candle produces a sulfur dioxide gas, which has a distinct and unpleasant odor. This odor serves as an immediate warning sign when there are refrigerant leaks, as many refrigerants are odorless, making them difficult to detect without this method.

The burning sulphur can indicate the presence of a leak because the emitted gas will react with the refrigerant and create a visible change. This approach can help ensure the safety of the refrigeration environment and the efficiency of the system, allowing operators to address issues promptly.

Other options, while they deal with different aspects or functions, do not align with the primary purpose of using a sulphur candle in this context. For example, testing for moisture typically involves different instruments, while disinfection of water doesn't relate to the functions of refrigeration systems. Creating a warning signal through other means is more common in modern applications, where electronic detectors are preferred for safety and detection of leaks.