46 TX9165-UM-EN-07
• Short term exposure limit - COSHH
• Time weighted average - COSHH
• Time elapsed into monitoring period
• Current accumulated value
• Preset alarm limits that activate the
Exposure alarm signals of the eModule
for STEL and TWA
Checkpoint
STEL: Short term exposure limit of total
accumulated units over a rolling 15
minute period.
Checkpoint
TWA: Time weighted average of gas
concentration over a working eight hour
period.
Section 4.4.4
Section 4.3.6
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