Using an AUX EPC for helium pressure control at the inlet of a Markes Thermal Desorption unit

Hi

Actually, AUX EPC, used where we want to give controlled flow direct to column.

While other EPC is not giving direct flow to column.It's going to inlet like split/splitless/MMI/PP and after that flow going to column.

Rest valves installed with EPCs are of different type to achieve different purpose/application.

Thanks for the answer but I still fail to understand.

If helium pressure at the inlet of the TD is constant and only controlled manually, why can't it be controlled by the AUX EPC?

Can't I just connect one of the outlet of the AUX EPC through a tubing block assembly (Agilent ref. G3430-60550) to the inlet of the TD and set the pressure to 6 psi for example?

Basically, it comes under design based on application.

Aux EPC has one oulet and one inlet with each solenoid valve..Three valve are installed in Aux EPC.

In inlet of Aux EPC gas line and outlet of AUX EPC connected with column under controlled flow n pressure..

As you are saying to connect outlet of aux to TD, means inlet flow of aux will go to TD through outlet of aux thenafter what meachanism will be for column flow..

Basically, it comes under design based on application.

Aux EPC has one oulet and one inlet with each solenoid valve..Three valve are installed in Aux EPC.

In inlet of Aux EPC gas line and outlet of AUX EPC connected with column under controlled flow n pressure..

As you are saying to connect outlet of aux to TD, means inlet flow of aux will go to TD through outlet of aux thenafter what meachanism will be for column flow..

I might fail to understand how an AUX EPC works because I assume that, if I connect a column directly to an outlet of the AUX EPC and set it for 6 psi, I will get 6 psi of He at the beginning of the column at a flow fluctuating with the oven's temperature.

When we put a TD in the equation, according to my idea, it could be basically between the outlet of the AUX EPC and the column. My current setup lets me apply manually 6 psi of He, at the inlet of the TD, that will be directed to the column through the TD and its transfer line (outlet of the TD). Then, when there is the need to desorb a tube to the column, the flow is redirected internally with switching valves.

So, could I use an AUX EPC to set the carrier gas pressure instead of a manual gas regulator (like this one)?

Thank you.

Above is one flow diagram of markes TD..

Now where you want to connect AUX EPC.

Or share your instrument schematic diagram to understand better..

At the carrier gas supply inlet

Means AUX output will go to inlet of TD..