31
3 Operation
3.2.9
Warning %LEL
The measuring mode can be changed for the
Warning %LEL
application via this menu item.
A
WARNING!
Risk to life from operating signal failure
If the operating signal does not sound, the device is not
safe to operate.
●
Stop using the device immediately.
●
Leave explosive areas or areas with a toxic or low-ox-
ygen atmosphere immediately.
Area of use
– Testing work environments where explosion is possible, e.g.
when working on gas pipes or gas systems
Symbol
Unit
– % LEL or % vol.
Measuring range (methane CH
4
)
Infrared sensor
0 to 100 % LEL or
0.00 to 4.40 % vol.
Measurement data display
AL1
%LEL
CH4
14
70
80
40
50
60
90
100
0
10
20
30
– Digit, for example,
14 % LEL CH
4
– Bar display with linear scale,
alarm thresholds marked AL1
and AL2
Fig. 16: Warning %LEL measuring mode
