Uncertainty Analysis is available for most inputs in an Ansys Chemkin project. You can set up a probability distribution for the following properties:
Arrhenius reaction-rate parameters for gas-phase and surface reactions
Auxiliary reaction-rate parameters (for example, third-body efficiencies and pressure fall-off parameters for gas-phase reactions, coverage-dependent parameters for surface reactions, etc.)
Reactor properties, species-specific properties and material-specific data for all reactors in a network
Reactor properties, species-specific properties and material-specific data for a single reactor
Stream properties and species-specific data for an inlet stream
A property can be used in an uncertainty analysis if the Uncertainty Analysis icon is displayed next to (to the right of) the property in the input panel. When you place your mouse over the icon, it should display Setup Uncertainty Analysis as the tool tip. If the icon is inactive instead of being shown in color, the Uncertainty Analysis Facility is not enabled for that property for your current problem.