We purchased a new Delta V advantage that was installed in March. It came with a Duo 1.6 that is very gurgley (is that a word?). It hasn't yet given us any problems, and vacuum is good, but it was tough to get used to hearing that noise all the time when normally it is cause for concern. I mentioned the noise when it was installed and the installer told me the same thing -the sound is normal
From: Stable Isotope Geochemistry <[log in to unmask]> On Behalf Of Peter R
Sent: Tuesday, July 9, 2019 10:46 AM
To: [log in to unmask]
Subject: [ISOGEOCHEM] Duo 3M / Rotary Vane pump Gurgling
We received a brand new Duo 3M as a replacement for our Duo 2.5. When I plugged it into our Delta V advantage IRMS, the pumped gurgled initially, but continued to gurgle audibly. The Duo 2.5 typically stopped gurgling after a few mins. If I put my hand over the exhaust hose (just a 3ft peice of tubing attached to the exhaust port) outlet the sound goes away. I pulled the pump out to isolate the problem and closed off the inlet. The sound was still present so I know its coming from the pump. The Duo 3M works and gets to vacuum but the noise it a bit irritating. I spoke to a representative who told me the sound was normal and to get a silencer ( exhaust filter silencer).
Does anyone have any input or information?