11 WS-VOC Volatile Organic Compounds detector
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10)
Connect the span gas Tedlar bag to the
fluxmeter inlet.
The gas concentration should start
increasing.
Wait for the reading to get stable.
In the example, the isobutylene
concentration of the span gas mixtures
is 25 ppm.
11)
When the signal is finally stable, select
the interval by tapping on the screen.
The average and standard deviation of
the selected period is shown on the
display. A lower standard deviation
indicates a good signal stability.
Only the average value will be taken into
consideration for the calibration.
The data that remains outside of the left
and right cursors will be juts ignored.
Press the
NEXT
button to confirm the
interval and go on.