You can use DioxaneHCl Solution. Dissolve your amine in Solvent, then you add slowly DioxaneHCl Solution at 4deg C. The salt will precipitate, then filter and dry the amine salt.
Usage of a solution of HCl in dry ethanol / dioxane would be a better solution than using flow of HCl gas through the solution of the substrate in the solvent.
If the method involving the passage of dry HCl is to be followed, then the procedure should have provision for prevention of back-suction.