Средства индивидуальной защиты Hoffmann Group 2026 - страница 162

GBP 57 GAS MEASUREMENT TECHNOLOGY Pictograms: IP IP 68 67 Protection class IP68: Protection class IP67: For use in against dust, contact and against dust, contact explosion hazard areas. continuous submersion. and submersion. Gas measurement technology is used to detect the following gases and issue warnings about them: Risk of fire and explosion (Ex) Rick of suffocation or fire (Ox) Risk of poisoning (toxicity) due to flammable gases and vapours due to lack or surplus of by toxic gases such as such as methane (CH4) in vol. % concentrations oxygen (O2) in the vol. % range. carbon monoxide (CO), chlorine (Cl2) or above the lower explosive limit (LEL). hydrogen sulphide (H2S) in the ppm range. If a flammable gas mixed in the correct Air contains about 20.9 vol. % oxygen. Toxic gases and vapours can be ratio with oxygen comes into contact with a A concentration of below 17 vol. % potentially fatal even at source of ignition, represents an acute danger to health. low concentrations. this mixture can ignite At higher concentrations, explosively. oxygen acts as a promoter of fire. These hazards can be constantly monitored by portable single-gas or multi-gas detection devices. A single-gas detection device allows one hazard to be monitored, whilst a multi-gas detection device allows multiple hazards to be monitored concurrently. A testing tube allows point measurements to be performed. Physical properties of gases and their significance for gas measurement technology: Chemical Chemical formula Relative density Characteristics Methane CH4 0.55 - Quick thinning with air - The cloud rises up (buoyancy) Light gas Ammonia gas NH3 0.6  Measurement should be performed close to the leak - Even distribution Carbon monoxide CO 0.97  Measurement should be performed close to the leak Air 1 Hydrogen sulphide H2S 1.19 Carbon dioxide CO 1.50 - Little mixing with ambient air - Flows along the floor like a liquid Heavy gas  Measurement should be performed close to the floor Propane C3H8 1.56  Check ducts and hollows Sulphur dioxide SO2 2.26 162