TWA alarm
Increase the value by
pressing "▲" or
decrease by "▼", the modification can be
affirmed by "
" or unchanged if not pressing
"
".
STEL alarm
Increase the value by pressing "▲" or
decrease by "▼", the modification can be
affirmed by "
" or unchanged if not pressing
"
".
Save Indication
Select by pressing "▲" or "▼"; "NO" means
do not save changes and "YES" means save
changes. The modification can be affirmed by
"
" and exit setting mode or unchanged if not
pressing "
".
4. Adjusting and Calibrating
The detector has been well calibrated before leaving factory, and user needn't to
calibrate it usually. The detector can be calibrated according to the instruction in this
Section after it has been used for a long time or it is necessary to take a calibrating or
readjusting. Calibrating should be carried out only by a professional or a specially trained
user.
4.1 Zero point calibrating (Sensitivity calibrating for O
2
, 20.9%vol)
Zero point calibrating should be carried out in clean air every day or every time after
an alarm.
At normal measuring status, press and hold down "
" and "▼" for about 5 seconds,
the detector will be brought into zero point calibrating with an audible indication; pressing
"▲" or "▼" to select "YES" or "NO" and affirm by " ", the screen will display "CAL" and
flickering zero point calibrating symbol, and start a 20 seconds' countdown.
