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Ammonia detection in systems is effectively performed using a colorimetric detector, which is based on a chemical reaction that produces a color change in the presence of ammonia. This method involves the interaction of ammonia with specific reagents that react to form a measurable color response, allowing for the quantification of ammonia concentrations.

The other methods mentioned have limitations in effectively detecting ammonia. Litmus paper does not provide a reliable measurement for gaseous ammonia concentrations, as it primarily tests for acidity or alkalinity rather than specific gas detection. Sound detection and temperature changes are also not suitable methods for identifying ammonia since they do not have a direct correlation with the presence of ammonia in the atmosphere. Thus, using a colorimetric detector is the most accurate and practical approach for detecting ammonia in a system.