Short Term Exposure Limits (Stel Page) - MSA ALTAIR 5 Manuel D'utilisation

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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.
MONOCHROME DISPLAY
STEL
This page shows the average exposure over a running 15-minute
period.
When the amount of gas detected by instrument is greater than the
STEL limit:
Alarm sounds
Alarm LEDs flash
"STEL ALARM" message flashes.
To reset the STEL:
1. Access the STEL page.
2. Press the ▲ button.
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)
10-minute exposure of 35 ppm and
5 minute-exposure of 15 ppm:
(10 minutes x 35 PPM) + (5 minutes x 15 PPM)
This page can be de-activated through MSA Link.
! WARNING
15 minutes
15 minutes
COLOR DISPLAY
= 35 PPM
= 25 PPM
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