Pressure Sensor in an Experiment

I am running an experiment where I have a vacuum chamber attached to a vacuum pump and a pressure sensor: I use the pump to vary the pressure in the chamber between atmospheric and 1/16-th of atmospheric pressure.

I have been considering using a different gas for the pump apart from air (probably helium or argon), so I would have a canister of helium and then attach it to the entry valve. If a different gas is used apart from air, will the pressure sensor still register the correct pressure as the amount of gas in the chamber is varied, or does the sensor need to be calibrated for the fact that a gas of different molecular weight is being used? I am assuming that the pressure sensor still works in the same way and gives the correct reading for the pressure, but just checking.