Teledyne First Responder CG, User Handbook Manual, Page: 17 / 104

2-3
GENERAL INFORMATION FIRST RESPONDER CG - USER HANDBOOK
LEL, 0 – 100%
(CGI and CSM modes only)
The LEL range indicates the explosibility of the flammable
gas in the sample. This is displayed as a percentage of the
lower explosive limit (LEL) of the gas. For methane 100% LEL
corresponds to 4.5% Volume methane in Air. Above 100%
LEL, the instrument autoranges to Volume Gas.
When the LEL range is selected, LEL is displayed in the
top right corner of the LCD. From 0 to 10% LEL the digital
display resolves to 0.1% LEL. From 10 to 100% LEL the
digital display resolves to 1% LEL. The analogue bar graph
follows in 4% steps. An example of the LEL display is shown
in Figure 2-3.
The detection principle for this range is a catalytic reaction.
Fig. 2-3 LEL Range