Cap Pump G1367A shuts down after every sample

Sorry , i have to emphasize that the cap pump shuts down after every sample. Then it needs a Minute to set up the flow and pressure again. During this minute the autosampler loads the next sample and injects it, no matter what the flow/pressure looks like .

We need a constant flow over the whole measuremnet of all samples. And only shut down at the end of the sequence.

Hello,

You are mixing a capillary pump with an Analytical scale autosampler.  You didn't mention the flow rate but if you are using that pump in micro flow ranges, any pressure change will result in what you describe.  When the G7167B goes to make an injection, there is pathway switch [mainpass>bypass and then back to mainpass], which will cause a pressure differential.  That is why the G1376A behaves that way.  So, what you are struggling with can only be changed if you change the pump model.  I believe that pump can be changed from a micro to Normal mode which will allow you to operate it like a regular analytical pump up to 2ml/min but the EMPV and flow sensor will have to be bypassed.

Hello,

You are mixing a capillary pump with an Analytical scale autosampler.  You didn't mention the flow rate but if you are using that pump in micro flow ranges, any pressure change will result in what you describe.  When the G7167B goes to make an injection, there is pathway switch [mainpass>bypass and then back to mainpass], which will cause a pressure differential.  That is why the G1376A behaves that way.  So, what you are struggling with can only be changed if you change the pump model.  I believe that pump can be changed from a micro to Normal mode which will allow you to operate it like a regular analytical pump up to 2ml/min but the EMPV and flow sensor will have to be bypassed.