MSA ALTAIR 5X PID Operating Manual page 21

US
This page shows the lowest level of oxygen recorded by the device since turn-ON or since the MIN reading was reset. It is
only shown if an oxygen sensor is installed and enabled.
To reset the MIN reading:
1. Access the MIN page.
2. Press the p button.
Short Term Exposure Limits (STEL page)
WARNING!
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.
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:
3. Access the STEL page.
4. Press the p button.
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.
Time Weighted Average (TWA page)
21
= 35 ppm
= 25 ppm
ALTAIR 5X PID
4 Description