Time Weighted Average (Twa) (Figure 3-13); Warning - MSA Sirius Mode D'emploi

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The STEL alarm is calculated over a 15-minute exposure. Calculation
examples are as follows:
Assume the Detector 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
5-minute exposure of 15 PPM:
(10 minutes x 35 PPM) + (5 minutes x 15 PPM) = 28 PPM
If the STEL alarm condition is reached while using the
instrument as a personal or area monitor, leave the contam-
inated 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, which can
result in serious personal injury or death.

Time Weighted Average (TWA) (FIGURE 3-13)

Figure 3-13. Exposure Page with TWA Alarm
The TWA flag will appear in the upper portion of the display to
show the average exposure since the instrument was turned ON or
the TWA reading was reset.
= 35 PPM
15 minutes

" WARNING

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