MSA ALTAIR 4 Manual De Instrucciones página 457

MSA
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)
2.3.5 Time Weighted Average (TWA page)
Attention!
If the TWA alarm activates, leave the contaminated area
immediately; the ambient gas concentration has reached the
preset TWA 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 TWA icon
since the instrument was turned on or since the TWA reading was reset.
When the amount of gas detected is greater than the eight-hour TWA limit:
Alarm sounds
•
Alarm LEDs flash
•
TWA icon flashes.
•
To reset the TWA:
(1) Access the TWA page.
(2) Press the [
The TWA alarm is calculated over an eight-hour exposure.
GB
DECLARATION OF CONFORMITY CONTENTS
15 minutes
appears on the display to show the average exposure
] button.
ALTAIR 4 - Operating Manual 10088160/00 Y-HLR
= 35 ppm
= 25 ppm
17