We have a problem with one of our instruments. The vacuum is not strong although strong enough for the turbo pump to kick in.
We think this is the reason for our mass spec being so off (see below).
We ahve checked for leaks on the MS chamberdoor and checked the O-ring on it, we have also replaced the o-ring in the PFTBA valve that joints the screw nut that allows the system to vent, we have also checked the transferline and saw no leak and tightened the nut with still no resolution to the vacuum.
This was a sudden shift that didn't have any promting or events leading to it which is worrying for us as we have no predictor of when this may happen.
We have a spare dry external pump we are going to try incase it is the external pump, but wanted to know if anyone had any suggestions on resolving this/these issues?