Dry gas standards should not be used when the gas temperature is below the 'dew point' temperature for that gas.  The 'dew point' temperature is a function of the concentration of alcohol in the gas and the pressure of the gas in the tank. Contact Intoximeters technical support for specifics about the gas that you are using. As a general rule when using your dry gas standard, both the gas tank and the instrument should be at room temperature.