MSA ORION - Gas Measurement and Alarm Procedures

Measuring Gas Concentrations
Combustible gases (% LEL) (FIGURE 3-6)
The Orion 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).
•
When the
combustible gas
indication reaches the
Alarm Setpoint:
•
Alarm sounds
•
Alarm lights
flash
•
% LEL label
above the
concentration flashes.
•
To silence the alarm, press the CHANGE/RESET button.
NOTE:
The alarm will stay silent if the alarm condition
has cleared.
•
When the combustible gas indication reaches 100% LEL, the
LockAlarm
TM
circuit locks the combustible gas reading and
alarm and:
•
Alarm sounds
•
Alarm lights flash
•
100 appears on the display and flashes.
•
This alarm cannot be reset with the CHANGE/RESET button.
Figure 3-6. Instrument in LEL Alarm
Operating Manual Chapter 3, Using the Orion Multigas Detector
3-9