Large-scale refrigeration systems are an integral part of many industries, such as cold storage, petrochemical refining, and food processing. In such applications, Ammonia is the most common choice of refrigerant due to its effective physical properties and low freezing point, making it perfect for refrigeration uses. As ammonia is extremely dangerous to life and health at a concentration of 25ppm (8hrs) and 35ppm (15 minutes), it is critical for ammonia gas detectors to be used in such applications to maintain the safety of the plant and those in the vicinity.