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We use a 9 Litre tank on our old FACS II. We modified the tank as per a
short note (Constant Pressure Sheath Tank, M. Wilder & J. Jett) in an old
Los Alamos `Flow Systems Newsletter'.
Sheath Pressure _________________ Sheath Liquid
------------ | _______________
---------- | | |
____|_|__|_|____
|B | | | | |
| | | | | |
|--| |--| |--|<-- Fluid Level
| | | | | |
| | | | | |
| | | | | |
| |A| |
| |
------------
When connected as such, the pressure at point A is constant and independent
of liquid head height.
The pressure difference between A and B is due to the fluid level head
height. Hence by connecting a differential pressure guage between A and B,
one can also have a sheath fluid level indicator.
I haven't actually connected a pressure guage at the nozzle to see how well
this works, but we don't have too much trouble over the period of an
afternoon.
It's a long time since I've thought about the physics behind the above but
it is similar to the way we used to (many moons ago as a student!) connect
up fluid reservoirs, when running columns, to get constant flow.
I can't find the original newsletter but I hope this may be useful.
Leon.
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____
| | Dr. Leon Martin,
/ | _ Dept. of Pathology & Immunology,
| |-------> ( ) Monash University Medical School,
\ | ~ Commercial Rd., Prahran, Victoria,
|____| /| Australia, 3181.
__| |__ ___/ |
|_______|^^^^ --- e-mail: martin@cobra.path.monash.edu.au
| Phone: +61 3 276 2601
| Fax: +61 3 529 8359
--
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