MSA OPERATION
ALTAIR 4 - Operating Manual 23
3.2 Turning ON the Instrument
Instrument operation is dialog driven from the display with the aid of the
three Function buttons (see Section 2.2.1).
For more information, see the flow charts in Section 7.
Turn the instrument ON with the
[
]
button.
The instrument performs a self test and then goes to Fresh Air Setup:
• all display segments are activated
• audible alarm sounds
• alarm LEDs light
• vibrating alarm is activated.
During the self test, the instrument checks for missing sensors.
In the case of a missing sensor, the instrument displays the Sensor
Missing screen and alarms until it is turned OFF. Otherwise, the turn-
ON sequence continues.
The instrument displays:
• Alarm & display self test
• Manufacturer name
• Instrument name
• Software version
• Combustible gas type
• Toxic gas units
• Alarm set points ( , ) ( , )
• Calibration values
• Date and time display
• Last cal date (if activated)
• CAL due date (if activated)
• Sensor warm-up period
• Fresh Air Setup option.
Refer to flowchart in Appendix, Section 7.1.
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