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User name Jack
Log entry time 22:31:01 on February 21, 2010
Entry number 309568
keyword=Gas system status
The nitrogen cylinder switchover has not been working correctly. Earlier
the right cylinder emptied, but the controller still read it as full. I
replaced the comparator board in the controller with one that has more
hysteresis. While looking over the manifold I noticed the wires to the
pressure sensors were very corroded. Looks like the wire insulation
cracked and water got in. I was planning on re-doing those tomorrow. Kent
called me and said the low pressure alarm was on in the Counting Room. I
found the 12V supply in the controller shorted out. The sensor wires were
shorted together, probably from handling during inspection, and the
comparator board was installed backwards. I replaced the connectors,
checked the comparator board was still working, and put it all back
together. Hopefully things are working correctly, now.