MSA ALTAIR 4XR Operating Manual page 16

Minimum Readings (MIN page)
This page shows the lowest level of oxygen recorded by the device since turn-on or since the MIN
reading was reset.
The minimum icon ( chapter 2.3 "On-Screen Indicators") appears on the display.
To reset the MIN reading:
(1) Access the MIN page.
Press the  button.
(2)
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.
The STEL icon ( chapter 2.3 "On-Screen Indicators") appears on the display to show the average
exposure over a 15 minute period.
When the amount of gas detected by the device is greater than the STEL limit:
• Alarm sounds
• Alarm LEDs flash
• STEL icon 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 device 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 minutes exposure of 5 ppm:
(10 minutes x 35 ppm) + (5 minutes x 5 ppm)
This page can be de-activated through MSA GALAXY GX2 Test Stand or MSA Link.
= 35 ppm
15 minutes
= 25 ppm
15 minutes
®
ALTAIR 4XR
Description
US
16