MSA ALTAIR 4XR Operating Manual page 7

sphere contains the following materials, which may desensitize the combustible gas sensor and reduce
its readings:
• Organic silicones
• Silicates
• Lead-containing compounds
• Hydrogen sulphide exposures over 200 ppm or exposures over 50 ppm for one minute.
Check minimum concentration of a combustible gas
The minimum concentration of a combustible gas in air that can ignite is defined as the Lower Explo-
sive Limit (LEL). A combustible gas reading of "XXX" indicates the atmosphere is above 100 % LEL or
5.00 % vol CH , and an explosion hazard exists. Move away from hazardous area immediately.
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Observe atmosphere
Do not use the device to test for combustible or toxic gases in the following atmospheres as this may
result in erroneous readings:
• Oxygen-deficient or oxygen-rich atmospheres
• Reducing atmospheres
• Furnace stacks
• Inert environments
• Atmospheres containing combustible airborne mists/dusts.
Use the device only to detect gases/vapors for which a sensor is installed.
The device is suitable and certified for the measurement of the oxygen concentration in gas mixtures
for inertization according to EN 50104 but without alarm function.
Make sure >10% oxygen is present for accurate combustible readings with the catalytic sensor.
Not to be used for gases having a flash point in excess of 38 °C (100 °F)
Do not use the device to test for combustible gases in atmospheres containing vapors from liquids with
a high flash point (above 38 °C, 100 °F), as this may result in erroneously low readings.
Physical shock
Recheck calibration if device is subjected to physical shock.
Sensor maintenance
Do not block sensor openings as this may cause inaccurate readings. Do not press on the face of the
sensors, as this may damage them and cause erroneous readings. Do not use compressed air to clean
the sensor holes, as the pressure may damage the sensors.
Observe Proper Time for Display Stabilizing
Allow sufficient time for device to display accurate reading. Response times vary based on the type of
sensor being utilized.
Observe proper battery maintenance
Use only battery chargers made available by MSA for use with this device; other chargers may damage
the battery pack and the device. Dispose of in accordance with local health and safety regulations.
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Use of the MSA GALAXY
ALTAIR 4XR devices.
As the battery pack ages, there will be a reduction in usable device runtime.
Risk of explosion: Do not recharge device in hazardous area.
GX2 Automated Test System is an alternate approved method for charging
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ALTAIR 4XR
Safety Regulations
US
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