Chromatography Forum

Hi,

Can anyone tell me which will be the wright rates for the FID flow on Shimadzu GC-2010?

For now i have the H2: 40, air 400, makeup 30 ml/min, but is to much air for a continuous working. Even when I'm not using the FID, only the ECD the air is consumed. I tried to make the air 100 and H2 10, but it doesn't work.

thanks for any thought

Hi,

Can anyone tell me which will be the wright rates for the FID flow on Shimadzu GC-2010?

For now i have the H2: 40, air 400, makeup 30 ml/min, but is to much air for a continuous working. Even when I'm not using the FID, only the ECD the air is consumed. I tried to make the air 100 and H2 10, but it doesn't work.

thanks for any thought

proper flow for Shimadzu FID is like you set (40/400 with 30) why is it to much for you? Is flame consistent?

I don't have a diagram of the instrument but I do know on other brands of GC if the flame tip is not sealing and allows a diverse flow pattern of air and hydrogen from the detector the flame may not remain lighted properly or 'blow out' easily.

Do a manual measurement of the actual flow passing out the detector for each of the gases. Don't trust digital settings.

best wishes,

ROdney George

Hi Irina

I am not sure that I understand the problem. Are you trying to save air and hydrogen by running the FID with reduced flow rates, or do you have a problem with the FID using air at 400 ml min while you are not using it to do an analysis.

If you want the FID to work properly you cannot run it with reduced flow rates.

If the problem is the 400 ml per minute of air while the FID is not being used, then just turn the air and the hydrogen off.

Peter

Hi,

Can anyone tell me which will be the wright rates for the FID flow on Shimadzu GC-2010?

For now i have the H2: 40, air 400, makeup 30 ml/min, but is to much air for a continuous working. Even when I'm not using the FID, only the ECD the air is consumed. I tried to make the air 100 and H2 10, but it doesn't work.

thanks for any thought

proper flow for Shimadzu FID is like you set (40/400 with 30) why is it to much for you? Is flame consistent?

Is too much when I don't make an analyze and I only want to keep it stable. Here is very expensive the gas and when I don't have anything I want less gas flow

Peter's advice is correct.

Turn the gases off if the expense is too high.

best wishes,

Rodney George

Hi,

Can anyone tell me which will be the wright rates for the FID flow on Shimadzu GC-2010?

For now i have the H2: 40, air 400, makeup 30 ml/min, but is to much air for a continuous working. Even when I'm not using the FID, only the ECD the air is consumed. I tried to make the air 100 and H2 10, but it doesn't work.

thanks for any thought

proper flow for Shimadzu FID is like you set (40/400 with 30) why is it to much for you? Is flame consistent?

Is too much when I don't make an analyze and I only want to keep it stable. Here is very expensive the gas and when I don't have anything I want less gas flow

you must have gas saver option when you are not performing an analyze and that will do or you could make a method that has smallest gas consumption and you can activate it when you are done with samples.

br

proper flow for Shimadzu FID is like you set (40/400 with 30) why is it to much for you? Is flame consistent?

Is too much when I don't make an analyze and I only want to keep it stable. Here is very expensive the gas and when I don't have anything I want less gas flow

you must have gas saver option when you are not performing an analyze and that will do or you could make a method that has smallest gas consumption and you can activate it when you are done with samples.

br

thanks I will try the gas saver option

I tried to make a method for when I'm not performing analyze but gives me errors

Hello Irina

The gas saver function on every GC that I have ever used affected only the carrier gas - it has nothing to do with the detector gasses.

You do not need to leave the flame of the FID burning when you are not using the FID, so if you are not using the FID you should turn off the gasses to the FID. Turning the gasses off will not affect the stability of the detector when you next use it. You can leave the FID detector heater on if you are not using it. If you are not sure how to turn the detector gasses on and off then you need to study the users instructions for the GC.

Peter

Hello Irina

The gas saver function on every GC that I have ever used affected only the carrier gas - it has nothing to do with the detector gasses.

You do not need to leave the flame of the FID burning when you are not using the FID, so if you are not using the FID you should turn off the gasses to the FID. Turning the gasses off will not affect the stability of the detector when you next use it. You can leave the FID detector heater on if you are not using it. If you are not sure how to turn the detector gasses on and off then you need to study the users instructions for the GC.

Peter

Hello Peter

I know how to do that but I was afraid that I will damage the FID if I cut the gasses or it will affect the stability

Thank you for help

So it's ok if I leave the detector on and the flame and gasses off? It will not affect the integrity or the stability of the detector?

I used to turn the gc off when I didn't used it , but several people told me that it should be always on for more stability

Irina,

I leave my Hewlett-Packard 5890 GCs turned on with injector, column, and detectors heated 24 hours a day. When I am not analyzing samples, I turn down the carrier gas flow to a minimum setting (to preserve the column) and turn off the gases for the FID (air, hydrogen, and makeup). This allows me to conserve gases and when I need to run samples, all I have to do is adjust the carrier gas settings, turn on the gases for the FID and light the flame. The detector is stable in less than 1 hour.

So it's ok if I leave the detector on and the flame and gasses off? It will not affect the integrity or the stability of the detector? It is perfectly OK.

I used to turn the gc off when I didn't used it , but several people told me that it should be always on for more stability

Turning off the whole GC is very different to only turning off the gasses to the FID. A GC that has been turned off will take more than an hour to stablise when it is turned on again.

Peter