good day!I have a question.
Can I connect two-column to an ms detector? can i use a tee? will it be safe for the turbo pump because the flow will increase?
the simplest solution is a TWO hole ferrule, whereby both columns must have the same outer diameter.see for this: https://www.agilent.com/store/en_US/Prod-5062-3580/5062-3580
for the purpose of flows: the analytical column that is used gets the "normal" flow. the unused column gets a drastically reduced flow.
This should only be installed with (high performance) turbo pumps.
Turbo pumps have a maximum flow & an optimum flow, usually at 50% of the maximum flow.
With a HES I.S. the flow is very important, i.e. it must not be too high! regards, M.
very useful information!
Hi azrael, as mhardacker has posted, a two hole ferrule works well; but they are more prone to leaks than a single hole ferrule, and can let in a lot of air on temperature cycling. Could I recommend the Agilent G3181B Two-Way Splitter Kit with a fused silica restrictor going to the source? https://www.agilent.com/cs/library/usermanuals/public/G3181-90120_045611.pdf - You can use the "normal" and "drastically reduced" flow method mhardacker describes, and the restrictor help stop you exceeding the maximum flow for the MS. It gives you other advantages such as being able to change one of the columns without having to break the vacuum (turn the pressure up on the other column, and cool everything before removing the column).
If you have a spare EPC, the Agilent G3183B Three-Way Splitter Kit is better:-
https://www.agilent.com/cs/library/usermanuals/public/G3183-90120.pdf - It gives you other advantages such as "back-flush" and is a lot more flexible and easy to use.
Hi Tim !Thank you for the link and information.
I will study it. James also recommended this to me. in another topic.
I'm interested by this question as well.
Would it be possible to connect 2 columns to 1 MSD using a #Deans' Switch?
I think what possible. But need to consider several parameters: flow, id column, column temperature range....see also the topic change the column gc/ms without stopped turbo pump
However, I have the problem that the columns' IDs are different. Two holes ferrule is not an option.
- system 1 is: injector, column 1 (30m x 0.250mm x 0.25µm), MSD,
- system 2 is: Thermal Desorption unit, transfer line (ID 0.250mm), ultimate union, column 2 (50m x 0.320mm x 0.52µm), MSD.
So, whenever I have to switch system, I have to remove a column to put another. With all the risks associated with that operation. And, lately, I have not been successful because I believe the union is worn out and I have a leak.
Therefore, I would like to maintain both columns in the oven and switch from one system to another without too many operations.
The best would be a 4-way valve connecting both columns to the MSD but I don't know if any exists rated for up to 300ºC.
PS: GC is equipped with an unused extra EPC module (3 ports available)
I think can use this:
see attach document page number 7 https://www.agilent.com/cs/library/brochures/5989-9667EN.pdf
That's what I think as well.
A two or three way splitter with EPC.
I just received an info from an Agilent technician that a 4-way valve works but sooner or later will develop a leak.
That's too bad. It seemed like an elegant solution and easier to implement.
how you implement the solution for yourself, please tell us how it works in practice, very interesting.
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