CVS system sample water vapor management

An exhaust sampling system comprising:

• a pre-fill gas source having a pre-fill gas;
• a sampling conduit configured to collect exhaust gas and make-up gas;
• a sample bag fluidly connected to the sampling conduit and the pre-fill gas source;
• and
• a controller programmed to run a test procedure in which a sample of the exhaust gas and make-up gas is collected in the sample bag, the controller configured to send a command that fills the sample bag with a desired amount of pre-fill gas prior to the test procedure, with the pre-fill gas remaining in the sample bag during the test procedure wherein the desired amount of pre-fill gas corresponds to a predetermined pre-fill gas amount sufficient for subsequent analysis during a test procedure.

An exhaust sampling system comprising:

• a gas source having a gas;
• a sampling conduit configured to collect exhaust gas and make-up gas;
• a sample bag fluidly connected to the sampling conduit and the gas source;
• and
• a controller programmed to run a test procedure in which a sample of the exhaust gas and make-up gas is collected in the sample bag, the controller configured to send a command that fills the sample bag with a desired amount of gas, and wherein the desired amount of gas corresponds to a predetermined gas amount sufficient for analysis.