All of the ozone measurements were carried out by independent
accredited laboratories. All tests were made under controlled
real working conditions in accordance with EN/ISO
Ozone exposure is the key measure as it simulates the amount
of ozone that a welder will be exposed to during his normal working
day. It is measured behind the welding helmet during welding and
is also taken at a fixed point located 250mm horizontally and
250mm vertically from the arc.
Ozone levels are measured using a chemiluminescence analyser.
All of the reported work was carried out at TWI, Cambridge, UK
The occupational exposure limit for ozone is low and varies by
country. The limit of exposure in the UK is 0.2ppm ozone for a
15min reference period.