MSA OPERATION
ALTAIR 4 - Operating Manual 35
3.6 Function Tests on the Instrument
Alarm Test
Turn ON the instrument. Verify that:
• all LCD segments are activated momentarily
• alarm LEDs flash
• horn sounds briefly
• vibrating alarm triggers briefly.
3.7 Safe LED
The instrument is equipped with a green "SAFE LED". This green SAFE
LED flashes every 15 seconds under the following conditions:
• the SAFE LED feature is enabled
• instrument is in Measurement Mode (Normal Operation)
• combustible reading is 0% LEL or 0.00%CH
4
• Oxygen (O
2
) reading is 20.8%
• Carbon Monoxide (CO) reading is 0 ppm
• Hydrogen Sulfide (H
2
S) reading is 0 ppm or 0 mg/m³
• no gas alarms are present (low or high)
• instrument is not in Low Battery warning or alarm
• CO, H
2
S, STEL and TWA readings are 0 ppm or 0 mg/m³.
3.8 Bump Test
WARNING
Perform a Bump Test before each day’s use to verify proper instrument
operation. Failure to perform this test can result in serious personal injury
or death.
This test quickly confirms that the gas sensors are functioning. Perform a
full calibration periodically to ensure accuracy and immediately if the
instrument fails the Bump Test. The Bump Test can be performed using the
procedure below or automatically using the Galaxy Test Stand.
CSA requires (per 22.2 NO. 152) that the instrument's sensitivity be tested
before each day's use on a known concentration of methane equivalent to
25-50% of full scale concentration. ACCURACY MUST BE WITHIN 0 to
+20% OF ACTUAL. Correct accuracy by performing the calibration
procedure within this manual.
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