What is Gas Detection?

Gas detectors are useful for Commercial and Industrial use and can be used for Leak Detection but more importantly, Life Protection. In industry, they are used to detect very small leaks or fluctuations in levels of various gases for a certain level of toxicity.

HFC’s.  Ozone depleting chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs),

All R-400 (R-4xx) and R-500 (R-5xx) hydroflurocarbons are blends and there are lots of them. Many of these fluids are used for refrigerants. Hydro-Fluoro-Carbon (HFC)  such as Fluorocarbons, especially chlorofluorocarbons, were the most common refrigerant using since the 1920’s however,they are being phased out because of their ozone depletion effects.

HFC’s are currently subject to prohibition discussions on account of their harmful effect on the climate as well as being harmful to health when in certian concentrations.


According to the European Environment Agency (EEA), almost 10 million metric tons of ammonia are produced and used per year in Western Europe, making it one of the most common of all High Production Volume (HPV) industrial chemicals. Ammonia is commonly used in many industries, including petrochemical, pulp and paper, fertilizer and the oil industry to name but a few. Anhydrous ammonia (NH3) is also very widely used as a coolant in large industrial refrigeration systems. In fact, the use of ammonia as a refrigerant (R717) has increased substantially over the past several years as a replacement for environmentally unfriendly chlorofluorocarbon refrigerants. While ammonia refrigeration has long been a standard in the food/beverage industry, it is also now found in pharmaceuticals production, in air-conditioning equipment for many public buildings and in electric power generation plants. Ammonia is rightly regarded as a highly hazardous chemical. According to the EEA, the worst industrial accident of the last twenty years occurred on 21 September, 2001, when an ammonia / ammonium nitrate explosion at a fertilizer plant in Toulouse, France killed 30, and injured more than 2,000 workers and nearby residents. According to the government investigation, as horrific as the accident was, it could have been much worse if intervening buildings had not broken the force of the explosion, preventing the potential detonation of 20 more railroad tank cars full of anhydrous ammonia.

Ammonia is a highly toxic gas, and proper safety monitoring procedures and equipment must be in place at all times to avoid serious accidental injury or death. Besides its toxic properties, ammonia is also an explosively flammable gas, with a lower explosive limit (LEL) concentration of approximately 15% volume.  The key to a trouble-free system is understanding the limitations of the sensors, and choosing the correct sensors for the locations and conditions in which they will be operated.


Liquid and solid carbon dioxide are important refrigerants, especially in the food industry, where they are employed during the transportation and storage of ice cream and other frozen foods. Liquid carbon dioxide was used as a refrigerant prior to the discovery HFC refrigerants.

Carbon dioxide is present in fresh air we breath every day. (averaged between sea-level varies between 0.036%  and 0.041% , depending on the location). CO2 is an asphyxiant gas but not classified as toxic. In concentrations up to 1%, it will make some people feel drowsy and give the lungs a stuffy feeling. Concentrations of 7% to 10%  may cause suffocation, even in the presence of sufficient oxygen, you can suffer from dizziness, headache, impaired vision and hearing, and become unconscious within a few minutes to an hour.


So you can see specialised training is required when choosing the correct Gas Detection System for your premises. Electric Technics Ltd have been installing gas detection systems for over 15 years and have the knowledge and expertise to ensure that your compliance with legislation is for-filled.

Please contact us for more information.