Hi Peter. I don't know the Delta V, but if it also has rubber belts and a potentiometer for position reading (as does the 253 & Delta+), a slipping rubber belt may be the problem. It's easy to fix, but annoying. We changed the potentiometer, which reduced the problem, but the belt is still slipping. About once a week, we need to take the belt off the potentiometer wheel, turn the potentiometer wheel back, put the belt back on the wheel, and do hard- and software calibration. Andreas

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Andreas Pack

Georg-August-Universität

Geowissenschaftliches Zentrum

Goldschmidtstraße 1

37077 Göttingen

On 9 Mar 2017, at 20:23, Walter, Peter (NIH/NIDDK) [E] <[log in to unmask]> wrote:

Recently, the bellows on my Delta V Advantage started giving me problems. The left side will only expand up to ~70%, while the right side is perfect. Any ideas if this may be software (calibration) or hardware? Without opening the entire system is there a way to visually see if the bellows are moving the full range? If it may be a hardware issue, does anyone have a good schematic of the Delta V bellows?

Thanks

Peter

Peter J. Walter, Ph.D.

Director, Clinical Mass Spectrometry Core

NIH/NIDDK Building 10-9C106

10 Center Drive, MSC-1805

Bethesda, MD 20892

Phone: (301) 443-7307

Fax: (301) 443-7881

Email: [log in to unmask]