MSA ALTAIR 5 Operating Manual page 18

DESCRIPTION
2.4.3 Short Term Exposure Limits (STEL page)
If the STEL alarm activates, 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 and
persons relying on this product for their safety could sustain serious
personal injury or death.
Monochromatic display
This page shows the average exposure over a 15-minute period.
When the amount of gas detected by instrument is greater than the
STEL limit:
Alarm sounds, alarm lights flash.
•
Alarm LEDs flash
•
"
•
STEL ALARM
To reset the STEL:
(1) Access the STEL page.
(2) Press the [
The STEL alarm is calculated over a 15-minute exposure.
STEL calculation examples:
Assume the instrument 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
18
STEL
" message flashes.
] button.
ALTAIR 5 - Operating Manual
WARNING
Color display
= 35 ppm
MSA
= 25 ppm
US