MSA Orion G Mode D'emploi page 30

Operating Manual
• When the amount of gas detected by the Orion G Multigas and
Leak Detector is greater than the STEL limit:
• Alarm sounds
• Alarm lights flash
• The STEL flag flashes.
To Reset the Alarm:
1. Access the STEL page.
2. Push and hold the CHANGE/RESET button until the STEL
flag flashes.
3. Push the ON-OFF/PAGE button to reset the STEL.
The STEL alarm is calculated over a 15-minute exposure.
Calculation examples are as follows:
Assume the Orion G Multigas and Leak Detector has been running for
at least 15 minutes.
15-minute exposure of 35 PPM:
(15 minutes x 35 PPM )
15 minutes
• 10-minute exposure of 35 PPM
5-minute exposure of 5 PPM:
(10 minutes x 35 PPM ) + (5 minutes x 5 PPM )
Assume the Orion G Multigas and Leak Detector was turned ON five
minutes ago.
• 5-minute exposure of 15 PPM:
(5 minutes x 15 PPM ) + (10 minutes x 0 PPM )
If the STEL alarm condition is reached while using the
instrument as a personal or area monitor, leave the
contaminated area immediately; the ambient gas concentration
has reached the preset STEL alarm level. Failure to follow
this warning will cause over-exposure to toxic gases, which
can result in serious personal injury or death.
Chapter 3, Using the Orion G Gas Utility Instrument
= 35 PPM
15 minutes
15 minutes
" WARNING
= 25 PPM
= 5 PPM
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