Measuring Gas Concentrations; Combustible Gases (% Lel) - MSA SIRIUS Manual De Instrucciones

4. Measuring Gas Concentrations

4.1 Combustible Gases (% LEL) (Figure 8)
The SIRIUS Multigas Detector can be equipped to detect
combustible gases in the atmosphere. Alarms sound
when concentrations reach:
• Alarm Setpoint or
• 100% LEL (Lower Explosive Limit), 4.4% CH
When the combustible gas indication reaches the Alarm
Set point:
• Alarm sounds
• Alarm lights flash
• % LEL or CH flag above the concentration flashes
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To silence the alarm, press the RESET/
NOTE:
The alarm will stay silent if the alarm condition has cleared.
When the combustible gas indication reaches 100% LEL or 4.4% CH
circuit locks the combustible gas reading and alarm and:
• Alarm sounds
• Alarm lights flash
• 100 (or 4.4 in CH
• This alarm cannot be reset with the RESET/
WARNING!
If the 100% LEL or 4.4 vol.% CH
threatening situation; there is enough gas in the atmosphere for an explosion to occur. In
addition, any rapid up-scale reading followed by a declining or erratic reading can also be
an indication that there is enough gas for an explosion. If either of these indications
occur, leave and move away from the contaminated area immediately.
• After moving to a safe, fresh-air environment, reset the alarm by turning OFF the
instrument and turning it ON again.
Instrument in LEL Alarm
mode) appears on the display and flashes.
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alarm condition is reached, you may be in a life-
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Measuring Gas Concentrations
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button.
Figure 8:
button.
TM
, the LockAlarm
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