Fuel gas transmitter LCTR 903

methaneLPGhydrogen

The gas transmitter ADOS LCTR 903 is suitable for the detection of combustible gases, for example hydrogen, methane (natural gas) or propane / butane (LPG) in air in the LEL region. Two transmitter versions with different output signals are available: - 3-wire 4–20 mA - 4-wire LON® (LCTR 404) Three measuring principles are available: - VQ - TGS - IR Fields of Application Gas fired boiler systems Gas distribution station Gas transfer station Battery charging station The TGS sensor The TGS sensor contains a semiconductor sensor, which is constructed on SnO2 -sintered N-substrate. When combustible or reducing gases are absorbed by the surface of the sensor, the concentration of the test gas is determined by the change in conductivity. The VQ sensor The head of the VQ sensor functions on the principle of heat ­reaction. When combustible or reducing gases or ­vapours come in contact with the measuring element, they are subjected to catalytic ­combustion, which ­causes a rise in temperature. This rise causes a change in the resistance of the measuring element which is used as a measure of the component of gas being tested. The inert element is for compensating the temperature and conduc­tivity of the test gas.