DiVa nozzle salt volcano

dombkowski@helix.mgh.harvard.edu dombkowski at helix.mgh.harvard.edu
Wed Jun 25 20:20:55 EDT 2008

  The issue of buildup of salt on FACSVantage Diva is related to 
relative humidity in sorter environment. When humidity is low and air 
is dry the salt buildup is amplified. When humidity levels are higher 
the problem becomes less apparent.


Hi Frank,

We also saw this on our FACSVantageDiva a couple of years ago - also 
on the 70 micron nozzle at 30psi. It disappeared after a couple of 
weeks and has not reoccurred.

Conjecture at the time was that there were some "issues" with the 
in-house PBS but we were not able to get any further than that. 
Another possibility was the nozzle attachment - we replaced several 
o-rings around that time because of seepage. The visible seepage 
didn't correlate with the salt build so it wasn't an obvious cause 
but I guess there might have been low level seepage that could have 
been contributing.

Let us know if you work it out.


Adrian Smith
Centenary Institute, Sydney, Australia

On 24/06/2008, at 10:52 PM, Glenn Paradis wrote:

>Hi Frank,
>We saw the exact same phenomenon way back in the 1980's with our 
>FACStar Plus (10 PSI)	and then later with our FACS Vantage with 
>Turbo Sort Option (30 PSI).  A quick nozzle flush fixed the salt 
>buildup.  Switching nozzles did not solve the problem.  Our solution 
>was to move away from BD FACS Flow sheath fluid and go to NERL 
>Diluent 2.  When we switched, we never had the salt buildup again.
>Good luck.
>Glenn Paradis
>MIT Flow Cytometry Core Facility
><mailto:gap at mit.edu>gap at mit.edu
>On Jun 22, 2008, at 11:00 PM, WEHICytometry wrote:
>>In 31 years of flow cytometry I hadn't seen this before (although I 
>>don't get out much).	Lately we experience this phenomenon on our 
>>FACSVantageSEDiVa where, in the course of a few hours, the nozzle 
>>grows a salt volcano around the stream (I've attached a picture). 
>> This does not affect the breakoff nor the sort streams nor even 
>>the acquired data until the volcano grows high enough to impinge on 
>>the first laser.  It can also be removed easily by a wipe with a 
>>wet swab (although that's really inconvenient if the need arises 
>>during a sort).  Note: we are talking about a 70 micron nozzle 
>>running PBS as sheath at 30 psi - nothing fancy.
>>The question is: what causes it?  We *see* no leaks outside the 
>>nozzle tip but I'm wondering if the orifice has eroded and that's 
>>causing seepage.  Is there anyone who has seen this and/or has an 
>>idea of the cause?
>>Frank Battye. 
>>     |    |  << The Cytometry Laboratory
>>	\__/ <<<< The Walter & Eliza Hall Institute
>>------!!<<<<<< 1G Royal Parade, Parkville
>>	/!!\ <<<< Victoria 3050, Australia
>>     o !! \  << ph: +61_3_9345 2540, fax: +61_3_9347 0852

David M. Dombkowski
dombkowski at helix.mgh.harvard.edu
Flow Cytometry-Pathology-CPZN room 4310
Center for Regenerative Medicine and Technology
Massachusetts General Hospital
185 Cambridge Street
Boston,MA 02114
Tel (617)-726-1683
Fax (617)-724-3164

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