AMMONIA DETECTION

Ammonia

Ammonia in its anhydrous (dry) form is a colourless gas at room temperature with a characteristic pungent, irritating odour usually detectable by smell at less than 5 ppm. It is easily liquefied under pressure and dissolves in water to form ammonium hydroxide (NH4OH). It burns in air to form nitric oxide (NO) and water.
 
Although it is a natural product of human, animal and plant metabolism, exposure to high concentrations can cause severe respiratory tract and eye irritation, even to the extent of causing temporary blindness. Its main industrial uses are as a refrigerant gas, in the production fertilisers and in the production of chemicals such as nitric acid, acrylonitrile and aniline.
 
Ammonia Characteristics
Synonyms  
CAS No. 7664-41-7
Chemical formula NH3
Vapour density 0.59 (air = 1)
Safe Work Australia ES TWA 25 ppm
STEL 35 ppm
Flammable limits LEL 15.0 % by volume
UEL 33.6 % by volume
Equipment group IIA
Temperature classification T1
Chemical/physical properties Ammonia in its anhydrous (dry) form is a colourless gas at room temperature with a characteristic pungent, irritating odour usually detectable by smell at less than 5 ppm.
It is easily liquefied under pressure and dissolves in water to form ammonium hydroxide (NH4OH).
It burns in air to form nitric oxide (NO) and water.
Hazardous properties Although it is a natural product of human, animal and plant metabolism, exposure to high concentrations can cause severe respiratory tract and eye irritation, even to the extent of causing temporary blindness.
Occurrence/Uses Ammonia occurs naturally and is found in trace quantities in the atmosphere. Its main industrial uses are as a refrigerant gas, in the production fertilisers and in the production of chemicals such as nitric acid, acrylonitrile and aniline.
Detectors available Electrochemical (0 – 150 ppm)
Catalytic bead (0 – 100 % LEL)
Gas detector tube (0.2 ppm – 30% by volume)
Suggested alarm levels Lo: 25 ppm
Hi: 35 ppm

For more information about ammonia monitoring, contact your local Air-Met office today.

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