MSA ALTAIR O2 - Page 22

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OPERATION MSA
22 ALTAIR Operating Manual
(4) If the equalisation is successful ("OK" display), press the [TEST] key and
begin the calibration.
 "
CAL“ “?“ is displayed.
(5) During the "
CAL" "?" display, press the [TEST] key and start the calibration
mode.
 The value for the test gas in ppm is displayed.
(6) To change the value, press and hold the [TEST] key, until the desired value
is set.
 The new value for the test gas in ppm is displayed.
 After 3 s, the instrument returns to the calibration mode.
(6) Feed test gas into the instrument (possible test gases  "Test gases" table
in Section 5.2).
Attention!
The concentration of the test gas used must match the stipulated
value in the "Test gases" table in Section 5.2 for the relevant
instrument.
Otherwise, the calibration is not carried out correctly. If there is a fault,
it can lead to serious damage to health or even to death.
 The gas value, hour glass and "CAL" are displayed alternately.
 If calibration is successful, after approx. 90 s "
OK" is displayed and the
instrument returns to normal operating mode after 5 s.
 If calibration fails, "
ERR" is displayed and the instrument returns to
normal operating mode after 5 s.
The current values were not changed.
(7) If calibration fails, check:
 whether the correct test gas was used,
 whether the test gas cylinder is empty or the date has expired,
 whether the test gas hose was connected to the sensor,
 whether the flow governor is set to 0.25 l/min.
(8) If necessary, repeat steps (1) to (7).
 "OK" is displayed. Otherwise ("
ERR"), the instrument must be taken out
of use.
(9) Conduct a self-test to confirm the calibration.
 If the self-test is successful, a "" is displayed.