Toxic gas exposure limits and alarm levels

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Marketing

31 October 2024

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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
Ammoniak  NH3  25  35  50
Arsine  AsH3  0.05  –  0.05
Broom  Br2  0.1  0.2  0.1
Kooldioxide  CO2  5000  15000  5000
Koolmonoxide  CO  20  100  50
Chloor  Cl2  –  0.5  1 ceiling *
Chloordioxide  ClO2  0.1  0.3  0.1
Diborane  B2H6  0.1  –  0.1
Ethylene Oxide ETO  C2H40  5  –  1
Fluor  F2  1  1  0.1
Germane  GeH4  0.2  0.6  –
Waterstofcyanide  HCN  0.9  4.5  10
Waterstofchloride  HCI  1  5  5 ceiling*
Waterstoffluoride  HF  1.8  3  3
Waterstofsulfide  H2S  5  10  20 ceiling*
Nitrous Oxide  N2O  100  –  –
Stikstofoxide  NO  2  –  25
Stikstofdioxide  NO2  0.5  1  5 ceiling*
Ozon  O3  –  0.2  0.1
Phosgene  COCl2  0.02  0.06  0.1
Fosfine  PH3  0.1  0.2  0.3
Silane  SiH4  0.5  1  –
Zwaveldioxide  SO2  0.5  1  5

*C – Ceiling Limit

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