Appropriate gas sensor

Hi all,
I am completing a school project and am making a split system gas detector to sense for leakage of gas.
Just wondering what the best/ most appropriate gas sensor would be to measure refrigerant gasses such as; uron®, Suva® 9100, or Genetron®, AZ-20®, Suva® 407C, or Genetron® 407C.

Thanks you for any help in advance.

Liam_:
Hi all,
I am completing a school project and am making a split system gas detector to sense for leakage of gas.
Just wondering what the best/ most appropriate gas sensor would be to measure refrigerant gasses such as; uron®, Suva® 9100, or Genetron®, AZ-20®, Suva® 407C, or Genetron® 407C.

Thanks you for any help in advance.

Did your Google break?

Paul