120-00012
GasD 8000 Series User Manual
12/14/2020
16
Section 4 – Sampling
4.1 ZEROING THE ANALYZER
It is always a good idea to zero the analyzer prior to sampling. To accomplish this, ensure
the unit is in ON MODE and has been allowed to stabilize in this mode for several minutes.
Confirm that the flow rate has settled at the nominal flow rate (200 mL/m) and the display
value is not rising or falling significantly. Zero the instrument in an area where clean ambient
air is present as follows:
-
Press the
UP ARROW
button. The
ZERO
indicator will now be highlighted indicating
ZERO MODE is active.
-
Press the
ENTER
button. “Set ZERO” will
be indicated under the main display for 3
seconds indicating the value is being
zeroed. The display value will gradually
decrease toward 0. If zero is not attained,
repeat the process by pressing
ENTER
again.
-
When finished, press the
DOWN ARROW
button to exit ZERO MODE.
The instrument is now ready for sampling.
While in ON MODE, direct the SAMPLE PROBE toward the desired sample location and
allow sample to be drawn. The instrument will respond to any target gas in the area within
a few seconds.
When finished with sampling, press the
STOP BUTTON
once from ON MODE to return to
OFF mode. This stops the automatic data storage saving data space and battery life.
4.2 TAKING SAMPLES
