18
│ 3 Operation
3
Operation
3.1
Switching on the device
A
WARNING!
Risk to life due to contaminated ambient air
If the device is switched on in a contaminated environ-
ment
1
, incorrect measurement values may be displayed
in measuring mode.
●
Switch on the device only in clean air.
Each switch-on process is linked to activation of the buzzer, sig-
nal light and display. This allows the user to check the following
device functions:
Buzzer:
Is the audible signal working?
Signal light: Is the visual signal working?
Display:
Can incorrect pixels be seen in the inverse dis-
play?
A
WARNING!
Risk to life if device functions are faulty or missing
Checking the device functions at switch-on is necessary
for the safety of the user.
●
Monitor the device carefully during the switch-on pro-
cess.
●
Cancel the switch-on process if the check of any one of
the device functions is unsuccessful.
1
E.g. contamination with flammable hydrocarbons.
