17
3 Operation
Once you have started a measurement
Start measurement
in
the menu becomes
Stop measurement
. In some applications
this menu item is called
Save measurement
.
You can find detailed information on starting, stopping and saving
measurements in section 3.2.12.
Protocol
does not appear in the menu until you save a protocol
for the first time.
Purging
only appears in the menu in the ethane analysis appli-
cation.
Gas type CxHy
only appears in the menu if the device is equipped
for at least one further gas type apart from methane CH4.
3.2.2
Zero point
The zero point can be manually set under
Zero point
in the menu.
This is only necessary if the displayed fresh air measurement is
not zero after the end of the warm-up period.
Gas
Content in fresh air Correct zero point on device
CH
4
0 % vol.
0.0 % vol.
CO
0 ppm
0 ppm
CO
2
0.04 % vol.
0.04 % vol.
O
2
20.9 % vol.
20.9 % vol.
The manual zero point setting is not saved. The zero point can be
corrected by adjustment as often as zero point deviations occur
(see section 5.2
).
Requirements for correct setting of the zero point
●
Device has been switched on with fresh air.
●
Device continues to draw in fresh air.
Setting zero point (manual zero point setting)
1. Press
Menu
.
2. Select
Zero point
menu item. The values are automatically
adjusted. The device returns to measuring mode.
