Rki-instruments GX-8000(PT0-098) Uživatelský manuál stáhnout pdf (Strana 51)

10 Definition of Terms 9-2. List of accessories

- 51 - GX-8000

Definition of Terms

vol% Gas concentration indicated in the unit of one-hundredth of the volume

ppm Gas concentration indicated in the unit of one-millionth of the volume

%LEL An abbreviation for "Lower Explosion Limit."

LEL refers to the lowest concentration of a combustible gas in air capable of

causing explosion when ignited.

TWA An abbreviation for "Threshold Limit Value Time Weighted Average Limit." TWA

refers to a concentration limit of toxic substances as a time weighted average to

which repetitious exposure of almost all the workers in 8-hour work shift or a

40-hour work week does not have harmful effects on their health.

STEL An abbreviation for "Threshold Limit Value Short Term Exposure Limit." STEL

refers to a concentration limit of toxic substances to which everyday exposure of

workers for 15 continuous minutes lower than TWA does not have harmful

effects on their health.

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Rki-instruments GX-8000(PT0-098) Uživatelský manuál Strana 51