We offer a variety products for detecting water, ammonia & hydrogen sulfide leaks. Our three water sensitive sheets are the most popular. If you aren't sure what your problem requires, start with our 3 sheet sampler.
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Simply wet phenolphthalein ammonia litmus test paper and hold it near the suspected refrigerant leakage point. Most of the time this will be at a fitting & paper will change color. A slow leak in multiple locations along a length of pipe is much harder to detector. Try wrapping ammonia leak detection cloth around the pipe look for tiny color changes in the cloth.
Natural gas is normally odorless. Small amounts of sulfur based compounds are mixed in to give it a faint "rotten egg" smell. You're most likely to smell it near your furnace or hot water heater. Ammonia does have its own odor distinct odor though.