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Depressing the “RESET” pushbutton will reset the TWA value, the STEL
value, and time all to “0”. The instrument will automatically go back into the
Operating Mode and begin collecting measurement data.
The “DISABLE” pushbutton turns off the TWA/STEL functions. If the TWA/
STEL functions are off, one of the following screens will be displayed:
<gas> TWA/STEL MENU
TIME AVERAGE VALUES
For Toxic Gases
RESET ENABLE
Depress the “RESET” pushbutton to go back to the Operating Mode. De-
press the “ENABLE” pushbutton to turn on the TWA/STEL functions.
When the TWA/STEL functions are enabled, selecting the TWA/STEL Menu
as described in Section 6.2 will display one of the following screens:
<gas> TWA/STEL MENU
STEL = 0 ppm
For Toxic Gas TWA = 0 ppm @ 0:05
RESET SHOW
ON/OFF TWA/STEL
Depress the “SHOW TWA/STEL” pushbutton to display the STEL and TWA
values on the Operating Mode screen in real time in one of the following
screens:
0
STEL = 1 ppm
For Toxic Gases TWA = 0 ppm @ 0:03
MENU
To turn off the TWA/STEL display, go back to the TWA/STEL MENU. The
screen will now show “HIDE TWA/STEL” over the right pushbutton. Select
this pushbutton and the standard Operating Mode screen will appear.
The TWA/STEL data measurement functions will be reset by turning off the
instrument whether the function is enabled or disabled.
ppm
<gas>