Patent ID: 7404311

Claim:
A breath test simulator for producing breath test effluent having a controlled concentration of ethyl alcohol, the simulator comprising: a body comprising a jar and a lid defining a chamber; the lid comprising a heat conductive body; a liquid solution in the chamber, the solution comprising water and ethyl alcohol and having a known concentration of ethyl alcohol; a headspace in the chamber located above the solution in the chamber; a headspace heating member having a heating surface facing the headspace and located above the solution, the headspace heating member comprising a resistance heater on the heat conductive body; a temperature sensor on the heat conductive body; and a set point switch responsive to the sensor to activate and deactivate the resistance heater; an inlet tube having an air inlet end located outside the chamber, the inlet tube extending from the inlet end into the chamber to an air outlet end in the solution; an effluent outlet tube having an effluent inlet end located in the headspace, the effluent outlet tube extending from the inlet end out of the chamber to an effluent outlet end located outside the chamber; wherein the headspace heating member heats alcohol-water effluent in the headspace.