Improved infra-red procedure for the evaluation of calibrating units.
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Improved infra-red procedure for the evaluation of calibrating units.

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  • Creators:
    Flores, Arthur L.
  • Corporate Creators:
    John A. Volpe National Transportation Systems Center (U.S.)
  • Corporate Contributors:
    United States. National Highway Traffic Safety Administration
  • Subject/TRT Terms:
  • Resource Type:
    Research Paper
  • Geographical Coverage:
    United States
  • Corporate Publisher:
    John A. Volpe National Transportation Systems Center (U.S.)
  • NTL Classification:
    AGR-SAFETY AND SECURITY-SAFETY AND SECURITY;NTL-SAFETY AND SECURITY-SAFETY AND SECURITY;NTL-SAFETY AND SECURITY-Highway Safety;
  • Abstract:
    Introduction. The NHTSA Model Specifications for Calibrating Units for Breath

    Alcohol Testers (FR 72 34742-34748) requires that calibration units submitted for

    inclusion on the NHTSA Conforming Products List for such devices be evaluated using

    one of three alternate procedures, all of which were developed at the Volpe Center. The

    first uses gas chromatography and wet gas reference samples for evaluation. This

    procedure is no longer used because of the advent of dry gas CUs on the market. Gas

    chromatography is an inappropriate technique for evaluation of dry gases using wet gas

    reference samples. A second alternative uses gas chromatography with dry gas reference

    samples. The dry gas references were obtained from the National Institute for Science

    and Technology. A third procedure uses a non-dispersive infra-red spectrophotometry.

    This third procedure is the preferred one, since reference samples are prepared at the

    Volpe Center so that reliance on outside sources for reference samples is not necessary.

    This preferred procedure uses a National Patent Analytical Systems, Inc. Datamaster

    breath alcohol analyzer instrument to analyze samples. This device is a non-dispersive

    infra-red spectrophotometer designed for breath (ethyl) alcohol analysis and is listed on

    the NHTSA Conforming Products List for evidential breath testers. Analysis is based on

    the absorption of a band of infra-red radiation centered at 3.4 microns, a wavelength area

    that is strongly absorbed by alcohol and which at the same time is not interfered with by

    other possible substances found in human breath, other than acetone.

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