When you open the source again check the position of the small alignment pin at the gas inlet.
We had serious los of intensity after cleaning the source but the peakshape was ok and focus didn’t help.
After changing all the gas capillaries and the needle valve connection the Thermo service engineer decided to order an exchange source and by comparing the position of these pin we were able to locate the problem. On our source the pin was positioned halfway the opening of the gasinlet and on the exchange the gas inlet was open and the pin stuck out ~5mm of the source body.
We installed the exchange source and the intensity was back as normal.
[log in to unmask]" type="cite">I removed and cleaned the ion source for our delta V advantage. I changed a new filament and I put back the source and everything looks fine on isodat screen. Values are… HV= 3.01KV Box= 0.72 mA Trap= 0.77 mA vacuum= 1.4e-006 Magnet (steps)= 11572 When I select reference gas (CO2) on the conflo screen to do a jump calibration no CO2 gas is flowing into the system. I checked for a leak and NO leak, we have a half tank CO2 gas. It seems ions are not reaching the cups or ions are not generated. I checked the CO2 tank is open, conflo is open and SGE valve is open. I am planning to remove the source again and see if the small opening in the side of the ion source chamber is somehow blocked or miss aligned (even though I checked every thing before I put it back) . Or when I pushed the source into the mass spectrometer possibly a wire may have been disconnected?. Any advice or suggestions before I remove the ion source again to check for any loose connection. Thanks Million
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