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Workplace exposure limits. These are known as workplace exposure limits (WELs). They are listed in HSEs booklet EH40 Workplace exposure limits. If the substance is known to cause cancer or asthma (check the label/safety data sheet), you must control exposure to as far below the level as is reasonably practicable This means balancing the level, eh40 absbestos
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Most manufacturers gas monitors alarm levels are set in accordance with the EU Directive (EH40 in UK) or based on national standards of countries outside of the EU. In gas monitors, these are set as Time Weighted Average alarms.
This latest version of EH40, published in August 2018 has been updated to include new and revised workplace exposure limits (WELs) introduced by the 4th Indicative Occupational Exposure Limit Values (IOELV) Directive. The changes are laid out at the front of the document and include: 14 new substance entries;
EH40/2005 Workplace exposure limits 10 Substance CAS Workplace exposure limit Comments number Long-term exposure Short-term exposure limit (8-hour TWA limit (15-minute reference period) reference period) ppm mg.m-3 ppm mg.m-3 Acetaldehyde 75-07-0 20 37 50 92 R12, 36/37, 40 Acetic anhydride 108-24-7 0.5 2.5 2 10 R10, 20/22, 34
EH40 and long and short term exposure limits. EH40 provides two separate measurements for each substance listed (Table 1). These are long term exposure limits (LTEL) and short term exposure limits (STEL).
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