20
The calibration continues about 2 min, and then the unit displays “CHEM: SEARCH ON”. It
means that the calibration is completed and the instrument is ready to detect the CWA.
Figure 3.7 – Calibration completion screen
If the calibration fails during about 2 min due to a high CWA concentration or a high pollution
of the ionization chamber, the instrument automatically enters the ionization chamber blowing
mode and displays “CHEM: BLOWING”.
Figure 3.8 – Blowing mode screen
This mode ensures the additional blowing of the ionization chamber. The instrument
automatically returns to the calibration mode when the blowing is successfully completed.
CAUTION!
If the instrument continues blowing longer than 3 min, clean the gas lines,
ionization chamber and micropump, refer to section 5.2.
3.4.2.2 Checking with the CWA simulator
After completing the calibration procedure (the unit displays "CHEM: SEARCH ON", Figure
3.7), switch the unit to the CWA detection mode: turn the rotating head in the direction shown by
the arrow to match the mark on the head and the
∆
mark on the unit case. The unit displays
"CHEM: SEARCH":
Figure 3.9 – The CWA detection mode screen
