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
Brom  Br2  0.1  0.2  0.1
Kohlendioxid  CO2  5000  15000  5000
Kohlenmonoxid  CO  20  100  50
Chlor  Cl2  –  0.5  1 ceiling *
Chlordioxid  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  –
Cyanwasserstoff  HCN  0.9  4.5  10
Chlorwasserstoff  HCI  1  5  5 ceiling*
Fluorwasserstoff  HF  1.8  3  3
Schwefelwasserstoff  H2S  5  10  20 ceiling*
Nitrous Oxide  N2O  100  –  –
Stickstoffmonoxid  NO  2  –  25
Stickstoffdioxid  NO2  0.5  1  5 ceiling*
Ozon  O3  –  0.2  0.1
Phosgene  COCl2  0.02  0.06  0.1
Phosphin  PH3  0.1  0.2  0.3
Silane  SiH4  0.5  1  –
Schwefeldioxid  SO2  0.5  1  5

*C – Ceiling Limit

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