Have you switched to hydrogen carrier gas? What are your experiences?

Here are some tips in no particular order:

You must be careful with halogenated solvents and carbon disulfide as you may make acid in the inlet when using hydrogen carrier.  Some analyses cannot be run with hydrogen because of that.

The optimum carrier gas linear velocity is different than helium so use the available tools to get it right.

The signal to noise ratio on a GCMS system will be less than when running helium - up to 2x to 5x worse.

Library matching will not be the same as when running helium.

Hydrogen scrubs the inside of the gas regulator and supply tubing and you will see more noise for a while -- up to a few weeks -- as it does a better job cleaning than the manufacturer.

Make sure and read the Hydrogen Safety Manual -  G3870-90101.

The MSD pumping capacity for H2 is approximately 1/2 that of Helium.

– Performance turbo: 2 mL/min

– Standard turbo: 1 mL/min

– Diffusion pump: 0.75 mL/min

– Pressure pulsing: turbo < 3 mL/min, diffusion < 2.5 mL/min

Here are some tips in no particular order:

You must be careful with halogenated solvents and carbon disulfide as you may make acid in the inlet when using hydrogen carrier.  Some analyses cannot be run with hydrogen because of that.

The optimum carrier gas linear velocity is different than helium so use the available tools to get it right.

The signal to noise ratio on a GCMS system will be less than when running helium - up to 2x to 5x worse.

Library matching will not be the same as when running helium.

Hydrogen scrubs the inside of the gas regulator and supply tubing and you will see more noise for a while -- up to a few weeks -- as it does a better job cleaning than the manufacturer.

Make sure and read the Hydrogen Safety Manual -  G3870-90101.

The MSD pumping capacity for H2 is approximately 1/2 that of Helium.

– Performance turbo: 2 mL/min

– Standard turbo: 1 mL/min

– Diffusion pump: 0.75 mL/min

– Pressure pulsing: turbo < 3 mL/min, diffusion < 2.5 mL/min