ALTAIR 4X
GB
19
STEL calculation examples:
Assume the device has been running for at least 15 minutes:
15 minute exposure of 35 ppm:
10 minute exposure of 35 ppm and 5 minutes exposure of 5 ppm:
Time Weighted Average [TWA page]
The TWA icon [ chapter 2.3] appears on the display to show the average expo-
sure since the device 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 button.
The TWA alarm is calculated over an eight-hour exposure.
[15 minutes x 35 ppm]
= 35 ppm
15 minutes
[10 minutes x 35 ppm] + [5 minutes x 5 ppm]
= 25 ppm
15 minutes
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 per-
sonal injury or death.
FASIT Srl - Via Orsera 13/b - 34145 TRIESTE - ITALY - Tel +39 040 825604 - www.fasit.it
- info@fasit.it
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