Can any one confirm that when valve actuate in GC, that time atmospheric pressure change..if yes then how to correct so that same pressure will be there after n before actuation of valve..
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Can any one confirm that when valve actuate in GC, that time atmospheric pressure change..if yes then how to correct so that same pressure will be there after n before actuation of valve..
You will have to describe more what your system is. The valve does what? What kind of method do you have? we need some more information.
Most valve actuations on Agilent GCs are time based and are part of the method parameters. Standard GCs don't have pressure sensors to initiate the valve, something like that would be a custom solution.
If I had to guess, you are trying to load a sample loop on a valve in a consistent way? To ensure you are loading the same amount of sample each time?
Yes...it's 3 valve system...one 10 port n two six port valve in 7890 gc..Actuation of valve done by air supply as usual..But here point is that pressure before actuation and after actuation through loop, need to be same but how to varify it..
Please provide us a precise meaning of "atmospheric pressure". Do you mean air supply pressure? If yes, you just need to increase air pressure through gas regulator on top of gas tank. You can increase it to almost 5 Bar but this can increase the sound of actuation more loudly !
If you mean of atmospheric pressure something rather than air pressure, please share with us your valve diagram (like picture I send). I suppose you probably have a NGA with one 10 port and two 6 port valves. So please tell us more about your pressure problem and valve diagram.
Thanks for reply..See, valving system sitting on top of GC..Valves are inside valve box and actuators are on top of valve box..When valve goes on or off position due to actuation that time flow/pressure changes for short period..So i am asking how we can keep it at constant...This thing you can observe with external flow or pressure meter..GC is not going to give any error..
"flow/pressure changes" is happening for which gas? Where do you attache the flow or pressure meter?