Gas Measurement Instruments Gascoseeker 2-500, Руководство пользователя, Страница: 14 / 89

GASCOSEEKER 2-500 USER HANDBOOK
2
% LEL
The % L.E.L. (Lower Explosive Limit) range indicates the
explosibility of the flammable gases in the sample. In the
case of METHANE (NATURAL GAS) 100% L.E.L.
represents 5% by volume Methane in air. On this range
the operating principle is a catalyst reaction and the
instrument measures the heat developed by the
combustion of the flammable portion of the atmosphere
under test.
% Volume Gas
The % Volume Gas range indicates the total Volume of a
specific gas, usually METHANE (NATURAL GAS) present
with respect to air and is scaled over the complete range
0 - 100% Volume Gas. On this range the operating principle
of the detection system is thermal conductivity.