User name paschke
Log entry time 16:38:41 on April20,2004
Entry number 118664
keyword=Rich gas alarm when bottles switched
Rich gas alarm: Oxygen alarm at 50 ppm, and headed rapidly north.
Paged Jack. He responded quickly (Oxygen already up to 180ppm) to
tell us the alarm was caused by him switching bottles. The
contamination is measured outside of the detector itself; when
he switches bottles, flow to the detector is cut off, so the large
numbers (now 210 ppm) are only in the gas line, which is being
purged. Those numbers will drop, and the gas flow to the detector
will resume, when the line has been suitably purged.
So, no worries, mate. Suggestion for operating procedure: a heads-up from Jack before this process is started would be nice. But whatever,
at least we get to prove that we're awake in here.