Patent ID: 7493793
Filing Date: 2009-02-24
Classification: G01N,Y10T

Abstract:
1. A breath test simulator for producing breath test gas having a controlled concentration of ethyl alcohol, the simulator comprising: a jar and a lid forming a body defining a chamber; 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 heating member having a heating surface facing the headspace and located above the solution; a headspace heater in heat flow engagement with the heating member; and a control unit for the heater, wherein the control unit includes a switch responsive to a temperature value to activate the heater and deactivate the heater, and is adapted to control the heating member in order to maintain the temperature of gas in the headspace at an operating temperature substantially the same as the temperature of the solution in the chamber.