Oxygen Measurements (% O ); Toxic Gas And Voc Measurements - MSA SIRIUS Manual De Instrucciones

4 Measuring Gas Concentrations
4.1.1 Oxygen Measurements (% O
The SIRIUS Multigas Detector can be equipped to detect the amount of oxygen in the
atmosphere.
Alarms can be set to trigger on two different conditions:
• Deficiency/too little oxygen (setpoints less than 20.8)
• Enriched/too much oxygen (setpoints greater than 20.8).
When the alarm setpoint is reached for either of the above:
• Alarm sounds
• Alarm lights flash
• % O flag next to the concentration flashes.
2
WARNING!
If the Oxygen alarm condition is reached while using the instrument as a personal or
area monitor, leave the area immediately; the ambient condition has reached a preset
alarm level. If using the instrument as an inspection device, do not enter the area with-
out proper protection.
4.1.2 Toxic Gas and VOC Measurements (Figure 10)
The SIRIUS Multigas Detector can be equipped to detect:
• Carbon Monoxide (CO) and/or
• Hydrogen Sulfide (H
• Volatile Organic Compounds (VOCs) in the atmosphere.
When the alarm set point is reached for Carbon Monoxide (CO) and/or Hydrogen Sulfide
(H S) and/or VOC:
2
• Alarm Sounds
• Alarm Lights flash
• PPM CO or PPM H
22
S) and/or
2
S or VOC flag flashes.
2
) (Figure 9)
2
Figure 9:
Instrument in
Oxygen alarm