Toxic gas exposure limits and alarm levels

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Marketing

31 October 2024

2 min ler

Artigo
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Alarm Levels

It is important to note that whereas portable gas detection instruments measure and alarm at the TWA levels, instantaneous alarms are included to provide early warning of an exposure to dangerous gas concentrations. Workers are often under risk of gas exposure in situations where atmospheres cannot be controlled, such as in confined space entry applications where alarming at TWA values would be inappropriate.

You must perform your own risk assessment to ensure alarms are set to appropriate levels for your application and in accordance with local legislation and practices.

The following data has been extracted from EH40 and EH40 for some common toxic gases:

Workplace Exposure Limits:
  WORKPLACE EXPOSURE LIMITS
(EH40/2005)
OSHA-PELs
SUBSTANCE CHEMICAL FORMULA LTEL (8hr TWA) PPM STEL (15 minute TWA) PPM LTEL (8hr TWA) PPM
Amoníaco  NH3  25  35  50
Arsina  AsH3  0.05  –  0.05
Bromo  Br2  0.1  0.2  0.1
Dióxido de carbono  CO2  5000  15000  5000
Monóxido de carbono  CO  20  100  50
Cloro  Cl2  –  0.5  1 ceiling *
Dióxido de cloro  ClO2  0.1  0.3  0.1
Diborane  B2H6  0.1  –  0.1
Ethylene Oxide ETO  C2H40  5  –  1
Flúor  F2  1  1  0.1
Germane  GeH4  0.2  0.6  –
Cianeto de hidrogénio  HCN  0.9  4.5  10
Cloreto de hidrogénio  HCI  1  5  5 ceiling*
Fluoreto de hidrogénio  HF  1.8  3  3
Sulfureto de hidrogénio  H2S  5  10  20 ceiling*
Nitrous Oxide  N2O  100  –  –
Óxido Nítrico  NO  2  –  25
Dióxido de azoto  NO2  0.5  1  5 ceiling*
Ozono  O3  –  0.2  0.1
Phosgene  COCl2  0.02  0.06  0.1
Fosfina  PH3  0.1  0.2  0.3
Silane  SiH4  0.5  1  –
Dióxido de enxofre  SO2  0.5  1  5

*C – Ceiling Limit

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