MSA OPERATION
ALTAIR 4 - Operating Manual 37
(5) Press the
[
]
button to start the bump
test then open the valve on the regulator.
The hourglass will flash and the sensors
will respond to the gas.
COMB/EX
O2
After the Bump Test completes, the
instrument momentarily displays “BUMP
PASS” or “BUMP
ERROR” along with
the label of any sensor that failed before
returning to Measure mode. If the
instrument fails the Bump Test, perform a
calibration as described in section 3.9.
COMB/EX
H2S
The √ symbol will be displayed in the Measure mode for 24 hours after a
successful Bump Test.
3.9 Calibration
The ALTAIR4 can be calibrated either manually using this procedure or
automatically using the Galaxy Test Stand. Refer to 7.7 of the appendix.
Calibration must be performed using a flow regulator with a flow rate set to
0.25 liters per minute.
If a battery charging cycle is interrupted before it is completed (4 hours for a
fully discharged battery), allow the instrument’s internal temperature to
stabilize for 30 minutes before performing a Calibration.
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