What's inside a Dräger Multiwarn II gas detection warning system used in mining, oil, chemical, and emergency services etc to detect hazardous or explosive atmospheres.<br />Intrinsic safety design and how both catalytic bead and infrared IR gas detectors work, and pellistors.<br />And a teardown of a Hydrogen Sulfide (H2S) sensor.<br /><br />http://www.a11supply.com/images/file/rev1_MultiWarn%20II_En.pdf<br />http://www.draeger.com/sites/assets/PublishingImages/Products/cin_x-am_5600/US/draeger-sensor-portable-handbook-9046571.pdf<br />http://www.xinpian.net/MOTOROLA/MC68HC711/MC68HC11E1.pdf<br />Forum: http://www.eevblog.com/forum/blog/eevblog-603-gas-sensor-teardown-drager-multiwarn-ii/<br /><br />EEVblog Main Web Site:<br />http://www.eevblog.com<br />EEVblog Amazon Store:<br />http://astore.amazon.com/eevblogstore-20<br />Donations:<br />http://www.eevblog.com/donations/<br />Projects:<br />http://www.eevblog.com/projects/<br />Electronics Info Wiki:<br />http://www.eevblog.com/wiki/
