For National Women in Engineering Day this year we have asked the newest member of our Technical Support team, Jackie Marsh, to tell us about her role here at Crowcon and her views on the importance of encouraging more women to get into engineering.
Some things are the same all over the world. A tragic case in point – three incidents that came up on our news feed this week of people dying of exposure to toxic gases after entering sewerage systems.
Here is our final video in the series illustrating the working of hydrocarbon gas detecting sensors. This time, we show the basic mode of operation of an infrared (IR) sensor for flammable gases.
Infrared emitters within the sensor each generate beams of IR light . Each beam is of equal intensity and is deflected by a mirror within the sensor on to a photo-receiver, which measures the level of IR received. The “measuring” beam, with a frequency of around 3.3μm, is absorbed by hydrocarbon gas molecules, so the beam intensity is reduced . The “reference” beam (around 3.0μm) is not absorbed, so arrives at the receiver at full strength. The %LEL of gas present is determined by the difference in intensity between the beams measured by the photo-receiver.
By answering this short survey on use of alarms on your portable gas detection device, it will help us improve our training materials, as well as our communication generally. We would very much appreciate your input, It takes less than two minutes, and your responses are completely anonymous.
If you would like further information on exposure limits, please take a look at our blog entry from 21st August 2014.