sewerin VARIOTEC 480 EX - Occupational Exposure Limits (Oels) and Excess Factors (STEL and LTEL); Alarm Thresholds (Factory Settings)

78
7 Appendix
7.2.2 Occupational exposure limits (OELs) and excess factors
(STEL and LTEL)
The short-time exposure limit (STEL) is calculated by multiplying
the OEL value by the excess factor over an averaging time of
15 minutes, as per /15/.
The long-time exposure limit (LTEL) is obtained from the OEL
over an averaging time of 8 hours, as per /15/.
Gas OEL Excess factor
CO 30 ppm 1
7.2.3 Alarm thresholds (factory settings)
Gas AL1 AL2 AL3 AL4 STEL LTEL
CH
4
10
% LEL
50
% LEL
100
% LEL
3 ppm — —
C
3
H
8
10
% LEL
50
% LEL
100
% LEL
3 ppm — —
C
4
H
10
10
% LEL
50
% LEL
100
% LEL
3 ppm — —
O
2
18.0
% vol.
23.0
% vol.
25
% vol.
— — —
CO 30 ppm 60 ppm 500 ppm — 30 ppm 30 ppm