sewerin EX-Tec HS 610, Operating Instructions Manual

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7 Appendix
7.2.2 Occupational exposure limits (OEL) and excess factors
(STEL and LTEL)
The short-time exposure limit (STEL) is calculated by multiplying
the OEL by the excess factor over an averaging time of 15 min-
utes, as per /15/.
The long-time exposure limit (LTEL) is obtained from the OEL
over an averaging period of 8 hours, as per /15/.
Gas OEL Excess factor
CO
2
0.50 % vol. 2
H
2
S 5 ppm 1
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 — —
CO
2
0.50 % vol. 1.00 % vol. 5 % vol. — 1.00 % vol. 0.50 % vol.
O
2
18.0 % vol. 23.0 % vol. 25 % vol. — — —
H
2
S 5 ppm 20 ppm 100 ppm — 5 ppm 5 ppm
CO 30 ppm 60 ppm 500 ppm — 30 ppm 30 ppm