ALTAIR 2X
37
Use
GB
3.13 Calibration
The device must be calibrated if it does not pass a bump test.
Perform a bump test (see section 3.5) before each day's use to verify proper
device operation. The device must pass the bump test. If it fails the test, perform
a calibration before using the device.
A calibration consists of the adjustment of the sensor output to match the
precise concentration value of a known, traceable, calibration gas cylinder. A
calibration can be performed at any time to ensure maximum accuracy. Calibra-
tion frequency is often stipulated by national or corporate regulations; however,
a calibration should be performed periodically at regular intervals or if the unit
fails a bump test. MSA recommends a calibration interval of 2 months for
devices with XCell Pulse technology and a maximum 6 months for devices with
standard XCell sensors.
Make sure that the calibration is carried out in clean, non-contaminated ambient
air.
WARNING
Regulators and tubing used for bump testing and calibrating Cl
2
or NH
3
must
be labelled by the user for that specific gas and must only be used for that gas
exclusively in the future.
Due to high reactivity of Cl
2
and NH
3
gas, ambient humidity and cali-
bration tubing material can react with the gas and cause the concen-
tration reading to be lower than the actual concentration. When
calibrating or bump checking with these gases, use dry tubing (for
adequate material see section 7). For best calibration, use the
shortest possible tubing to connect to the calibration cylinder for this
gas.
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