MSA ALTAIR 4 Operating Manual page 38

OPERATION
3.9.1 Zero Calibration
To skip the ZERO procedure and move directly to the calibration span
procedure, push the [
instrument prompts user to perform a SPAN calibration before returning to
the Normal Operation mode.
(1) Press and hold the [
Operation mode for three seconds
(2) If calibration lockout option is selected, enter password.
ZERO screen is then displayed.
•
If calibration lockout option is NOT
selected:
• ZERO screen displays.
(3) With the instrument exposed to fresh air,
press the [ ] button to confirm the
ZERO screen.
• The hourglass will flash during the
10 second sensor zero adjustment.
After ZERO calibration completes, the
instrument momentarily displays "
" or "
PASS ZERO ERR
flag of any sensor that failed.
38
] button. If no button is pushed for 30 seconds, the
] button in Normal
YES NO
Password
Correct?
ZERO
" along with the
ALTAIR 4 - Operating Manual
MSA
COMB/EX COMB/EX O2
O2
CO H2S CO H2S
COMB/EX O2
CO
H2S
CO