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MSA
3.10. Calibrating the Instrument
The ALTAIR PRO must be calibrated if it does not pass a bump-test.
Under normal circumstances MSA recommends calibration at least
every six months, however, many European countries have their own
guidelines. Please check your local legislation.
For instruments used to monitor oxygen calibration must be carried out in the
following cases:
any change in the air pressure (including height above sea-level change),
any extreme changes in the atmospheric temperature (
if the bump-test failed,
at certain intervals by local procedures.
For instruments used to monitor toxic gases (CO and H
carried out in the following cases:
after major shocks,
any extreme changes in the atmospheric temperature,
after use under high gas concentrations,
if the bump-test failed,
at certain intervals by local procedures.
Calibration - Toxic Gases
Attention!
Regulators and tubing used for bump testing and calibrating Cl
NH
and must only be used for that gas exclusively in the future.
Make sure that the calibration is carried out in clean, non-contaminated
ambient air.
Due to high reactivity of Cl
calibration tubing material can react with the gas and cause the
concentration reading to be lower than the actual concentration. It is,
therefore, necessary to use dry tubing when calibrating or bump
checking with these gases. For best calibration, use the shortest
possible tubing to connect to the calibration cylinder for these gases.
FASIT Srl
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, HCN or PH
should be labeled by the user for that specific gas
3
3
and ClO
, gas, ambient humidity and
2
2
OPERATION
Section 5.1),
S), calibration must be
2
, ClO
2
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