I would like to know if anyone of you ever had any problems with detectors
(or any parts connected to them - for instance amplifiers) in Delta Plus
(was bought in 1999 and since them we didn't clean the detectors, nor the
Our problem is that the results (of our standards) are very random - five
good ones, then four bad ones (mainly oxygen isotopes in CO2), with no
apparent reason. We have Kiel IV connected to MS and we alredy checked
every possible defect, ie. pneumatic valves, cold fingers etc. So the
problem does not lie in Kiel.
We also checked Dual Inlet in Delta Plus - no problems there.
Every possible connection, valve etc. was checked - no success.
Zero test in Dual Inlet checks ok.
One potential cause may be the fact that once during servicing we had a
short curcuit on one of the printed curcuit boards and we had it replaced.
So our last option are 1. the ion source which needs to be cleaned or 2.
the detectors or amplifiers.
So if anyone had similar problems with similar symptons - please let me know.
Insitute of Geological Sciences, PASc,
Twarda 51/55, 00-818 Warsaw, Poland.