4. LEL only: Type of calibration gas
(standard) has changed significantly. LEL
calibration gas may be based on several
different response standards, methane,
propane and pentane are the most
common. If using a new cylinder of
calibration gas, make sure that the type
and amount of combustible gas is identical
to that of the previous bottle. Honeywell
Analytics offers calibration gases in
Methane, Propane Equivalent and
Pentane Equivalent.