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Yes, I removed the cover and checked the capillaries to see if there was a
flow.
Also heated after the regulator but no changes. It wasn't a prolonged heat
because not everything is metal inside the conflo, but it was enough time
to make it hot. I hope one of the other steps will work.





On Fri, Feb 3, 2017 at 4:48 PM, Harlow, Benjamin <[log in to unmask]> wrote:

> To get to the valve block you have to take the cover off the conflo. That
> is where I would focus. Did you try heat after the conflo regulator?
>
>
>
> I wouldn't rely on smell or get my nose anywhere near SO2. I got a whiff
> once and it was very unpleasant. An SO2 leak detector is a must for the
> safety of yourself and anyone in the lab. Our leak detector is always on.
>
>
>
> *From:* Stable Isotope Geochemistry [mailto:[log in to unmask]] *On
> Behalf Of *Mayara Matos
> *Sent:* Friday, February 03, 2017 11:51 AM
> *To:* [log in to unmask]
> *Subject:* Re: [ISOGEOCHEM] Help with SO2 problem
>
>
>
> Thank you very much for the suggestions!
>
>
>
> I double checked and Conflo IV capillaries were all tightened, we'd
> probably be able to smell something if there was a leak. There's also a
> flow downstream the regulator, but maybe it's just not enough to show a
> signal. I passed a heat gun along the SO2 supply lines but nothing changed,
> although it really makes sense that there might be a combination of liquid
> and gas bubbles somewhere in the path length.
>
> My next plans are to switch the SO2 to an argon tank and see if it can
> unblock the line. If it doesn't work, I'll change the capillary from the
> heated regulator and ultimately change the regulator itself. Hopefully, one
> of these will work!
>
>
>
> Best wishes,
>
>
>
> Mayara
>
>
>
>
>
>
>
>
>
> On Fri, Feb 3, 2017 at 1:01 PM, Harlow, Benjamin <[log in to unmask]> wrote:
>
> Hi Mayara,
>
>
>
> Have you tried a mass scan with SO2 on? Perhaps looking at your
> calibration or focus settings could help.
>
>
>
> If the mass scan comes up with nothing, I would try a heat gun along the
> path length of SO2. My suspect would be the reference supply block.
>
>
>
> From my experience, SO2 needs the most free flowing, simple path as
> possible. The regulator may be heated, but the SO2 will probably be going
> back to liquid at any other cool spots. It is not the type of gas that
> conforms well to being turned on/off via valves, such as in the conflo IV.
> Personally, I prefer to use my older, simpler interfaces like a Conflo III
> and I use a devoted supply line all the way to the open split for SO2.
> There was some talk about issues with SO2 and the conflo IV in the past
> year I think. I would suspect the reference gas supply block might be a
> bottle neck for SO2.
>
>
>
> None of our SO2 supply is heated. The key for us was to add a purge valve
> with large diameter capillary going to vent. This allows us to let the SO2
> flow at a higher rate from what is permitted via the reference capillary
> and it gets the SO2 moving. I picture the SO2 supply lines having bits of
> liquid and gas bubbles within after any lapse in service. We can go from
> having our SO2 off at the tank to full flow in about 30 minutes. And we can
> drain the SO2 line in about 30s if we ever want to service something.
>
>
>
> Good luck,
>
>
>
> Ben
>
>
>
>
>
> *Benjamin Harlow*
>
> Manager, Stable Isotope Core Laboratory
>
> Washington State University
>
> 367 Eastlick | Pullman, WA  99164-4236
>
> Office: 509-335-6161 <(509)%20335-6161> | Lab: 509-335-6154
> <(509)%20335-6154> | Fax:509-335-3184 <(509)%20335-3184>
>
> http://www.isotopes.wsu.edu
>
>
>
>
>
>
>
>
>
> *From:* Stable Isotope Geochemistry [mailto:[log in to unmask]] *On
> Behalf Of *Mayara Matos
> *Sent:* Friday, February 03, 2017 8:15 AM
> *To:* [log in to unmask]
> *Subject:* [ISOGEOCHEM] Help with SO2 problem
>
>
>
> Dear colleagues,
>
>
>
> I'm seeking for some help from the ones working with S analysis in
> EA-IRMS. My reference SO2 peaks started to gradually disappear over time
> until no signal was observed, which made me think the tank was getting
> empty. This assumption combined with the low vapor pressure in the SO2 tank
> (showing a pressure around zero) made us purchase a new tank...
>
>
>
> After installing the new SO2 tank, Isodat shows readings of no more than 1
> mV for m/z 64 and 3mV for m/z 66. Because of this, an error message always
> pops up saying: "running script returns a fatal error: peak center failed."
> I opened our Conflo IV and checked if there was an actual gas flow from the
> tank to the capillaries coming out of the heated SO2 regulator (Conflo IV)
> and everything seems okay. Also, when I run a sequence for CNS, everything
> works fine for C and N but the system cannot make a jump to SO2.
>
>
>
> Does anyone have a suggestion on how I can fix this problem? I couldn't
> find this exact issue on the Isogeochem archives.
>
>
>
> Any help is appreciated.
>
>
>
> Thank you!
>
> Regards,
>
>
>
>
>
> Mayara Matos
>
>
>
>
>
> --
>
> *Mayara P. V. Matos *
>
> PhD Candidate
> Graduate Teaching Assistant
>
> Department of Biology
>
> West Virginia University
>
> 221 Oglebay Hall/ 4224 Life Sciences Building
>
> Morgantown, WV 26506
>
>
>
>
>
> --
>
> *Mayara P. V. Matos*
>
> PhD Candidate
> Graduate Teaching Assistant
>
> Department of Biology
>
> West Virginia University
>
> 221 Oglebay Hall/ 4224 Life Sciences Building
>
> Morgantown, WV 26506
>



-- 
*Mayara P. V. Matos*
PhD Candidate
Graduate Teaching Assistant
Department of Biology
West Virginia University
221 Oglebay Hall/ 4224 Life Sciences Building
Morgantown, WV 26506