Select base method > NRTL> then click on Henry Components and click New e.g. HC-1, Go to "Components" and then "Henry Comps", Select Henry components from the Available Components list. If they aren't there, go back to Components Specification and add those components.

Check the simulation method option

Chose the Binary Interaction

Chose the Henry option

Henry's equation is based on the four-parameter equation，and at least two or three parameters are required