MSACalibration
ALTAIR 4
22
GB
Finishing Calibration
(1) Close the valve on the regulator.
(2) Remove the calibration cap.
The calibration procedure adjusts the span value for any sensor that passes the ca-
libration test; sensors that fail calibration are left unchanged. Since residual gas
may be present, the instrument may briefly go into an exposure alarm after the ca-
libration sequence is completed.
Autocalibration Failure
If the instrument cannot calibrate one or more sensor[s], it goes to the
SPAN ERR page and remains in alarm until the user presses the p button.
Sensors that could not be calibrated are indicated by flashing sensor icons.
6.4 Fresh Air Setup [FAS]
The FAS is for automatic Zero calibration of the instrument.
The Fresh Air Setup has limits. The zero of any sensor that is outside of these limits
will not be adjusted by the FAS command.
- After the SPAN calibration com-
pletes, the instrument momentarily
displays “SPAN PASS” or
“SPAN ERR” along with the label of
any sensor that failed then returns
to the Measuring mode.
COMB/EX
O2
H2S
CO
COMB/EX
O2
H2S
CO
If the combustible sensor fails calibration after the full calibration proce-
dure in this manual has been performed, replace the combustible sen-
sor.
Warning!
Do not activate the Fresh Air Setup unless you are certain you are in
fresh, uncontaminated air; otherwise, inaccurate readings can occur
which can falsely indicate that a hazardous atmosphere is safe. If you
have any doubts as to the quality of the surrounding air, do not use the
Fresh Air Setup feature. Do not use the Fresh Air Setup as a substitute
for daily calibration checks. The calibration check is required to verify
span accuracy. Failure to follow this warning can result in serious per-
sonal injury or death.
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