What are the two primary methods for detecting small leaks in ammonia systems?

The primary methods for detecting small leaks in ammonia systems effectively include the use of sulfur sticks and litmus paper. Sulfur sticks are often used to identify the presence of ammonia gas through the detection of its characteristic smell; the sulfur emits a strong odor when it reacts with ammonia. This method is particularly useful in indicating the presence of ammonia in the air, as the odor from the sulfur can be a clear sign of a leak.

Litmus paper can also be used for leak detection because ammonia is a basic substance. When litmus paper, particularly red litmus paper, comes into contact with ammonia, it turns blue, indicating the presence of ammonia gas in the environment. This simple yet effective method provides a visual confirmation of leaks.

The other methods listed are not primarily focused on the detection of small leaks in ammonia systems. For instance, soap solution can help identify leaks in piping by forming bubbles around a leak, but it is not specifically designed for the detection of ammonia gas itself. The ultrasonic detector and pressure drop method is more involved and is used to measure larger or more systemic leaks by detecting the sound of escaping gas or differences in pressure, rather than subtle gas presence. Lastly, while pressure gauges and thermometers provide valuable operational data regarding system performance, they