MSA ALTAIR 5X Manuel D'utilisation page 21

Short Term Exposure Limits (STEL page)
If the STEL alarm activates, leave the contaminated area immediately; the ambient gas concentra-
tion has reached the preset STEL alarm level. Failure to follow this warning will cause over-exposure
to toxic gases and persons relying on this product for their safety could sustain serious personal
injury or death.
Monochromatic display
STEL
This page shows the average exposure over a 15-minute period.
When the amount of gas detected by device is greater than the STEL limit:
-
Alarm sounds, alarm lights flash.
-
Alarm LEDs flash
-
"STEL ALARM" message flashes.
To reset the STEL:
(1) Access the STEL page.
Press the  button.
(2)
The STEL alarm is calculated over a 15-minute exposure.
STEL calculation examples:
Assume the device 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 and 5 minutes exposure of 15 ppm:
(10 minutes x 35 ppm) + (5 minutes x 5 ppm)
15 minutes
This page can be de-activated through MSA Link software.
WARNING
= 35 ppm
= 25 ppm
ALTAIR 5X/ALTAIR 5X IR
Description
Color display
US
21