Tue May 03, 2016 8:23 pm by mleipold
Hi Chik,
I'm glad it was something as simple as that. It makes sense that %RSD is a nebulizer issue. I would expect, though, that your Tb Dual and Tm Dual would also have markedly changed from previous Tuning, though: it's been our experience that if a nebulizer is partially clogged or something, the Tb and Tm Dual go down b/c half your sample is winding up on the Spray Chamber walls.
Before you throw out the nebulizer, you might try checking the seal on the NG tubing. We haven't had a huge change in NG, but we have had that little O-ring on the NG screw start to slip. And when we've had seal problems on the Spray Chamber (missing O-ring, mis-aligned O-ring, or just not screwed together all the way), the MG value jumps noticeably from the previous Tuning.
I would also recommend re-tuning the machine *immediately* after a clean: that way, you remember what you did clean (and what you moved during the clean), and so it's easier to troubleshoot than if you're trying to remember even one day later.
Mike