140 Каталог HOFFMANN GROUP 2020 Промышленные средства индивидуальной защиты Стр.140

Каталог HOFFMANN GROUP 2020 Средства индивидуальной защиты Стр. 140 0140 Lab2u

Hoffmann Group 51 GAS MEASUREMENT TECHNOLOGY Pictograms: Protection class IP68: Protection class IP67: For use in against dust, contact and against dust, contact expl°si°n hazand areas. continuous submersion. and submersion. Gas measurement technology is used to detect the following gases and issue warnings about them: A Risk of fire and explosion (Ex) due to flammable gases and vapours such as methane (CH4) in vol. % concentrations above the lower explosive limit (LEL). Rick of suffocation or fire (Ox) due to lack or surplus of oxygen (O2) in the vol. % range. Risk of poisoning (Tox) due to toxic gases such as carbon monoxide (CO), chlorine (Cl2) or hydrogen sulphide (H2S) in the ppm range. If a flammable gas mixed in the correct ratio with oxygen comes into contact with a source of ignition, this mixture can ignite explosively. Air contains about 20.9 vol. % oxygen. A concentration of 17 vol. %, represents an acute danger to health. At higher concentrations, oxygen acts as a promoter of fire. Toxic gases and vapours can be potentially fatal even at low concentrations. 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 Light gas - Quick thinning with air - The cloud rises up (buoyancy) Ammonia gas nh3 0.6 Measurement should be performed close to the leak Carbon monoxide CO 0.97 - Even distribution Measurement should be performed close to the leak Air 1 Hydrogen sulphide H2S 1.19 Carbon dioxide CO 1.50 Heavy gas - Little mixing with ambient air - Flows along the floor like a liquid Propane C3H8 1.56 Measurement should be performed close to the floor Check ducts and hollows Sulphur dioxide SO2 2.26 140 SGD