Hello everyone,

I'm trying to put an HPLC instrument built in 2005 into use and facing an issue regarding the flow splitter.
This instrument is a Dionex UltiMate 3000 this has 2 pumps: one regular flow and the other microflow.
To achieve nanoflow, they installed a flow splitter in the flow manager unit, that splits the flow 1:1000 to achieve nL/min flow rates.
The flow splitter has one input and two outputs. There is a main output and a second output. There is a loop between the two and there is another line that goes to the back of the instrument where they placed a flow control unit and a waste outlet.
When I start the flow, I don't see any solvents coming out of the line that is supposed to be the nanoflow line.
I was wondering if there is anyone familiar with these splitters?
Is it possible that there is a buildup in the splitter?
There is no solvent coming out of the "second" outlet of the splitter. The manual says there should be a very minor flow coming out of it, while a higher flow is coming out of the "first" outlet of the splitter.