Foreline pressure has exceeded 300 mTorr

Only MSDs equipped with a diffusion pump have a foreline pressure gauge.

Too much column flow

On MSDs equipped with a diffusion pump, column (carrier gas) flow should not exceed 2.0 mL/minute. On MSDs equipped with a turbomolecular pump, column (carrier gas) flow should not exceed 4.0 mL/minute. Reduce the column flow and retune the MSD.

Air leak

Foreline gauge is not working correctly

Replace the foreline gauge. See the MSD maintenance documentation for instructions for replacing the foreline gauge.

Foreline pump is not working correctly

Replace the foreline pump or contact your Agilent Technologies service representative.