Calibration verification device

Details Calibration verification device Calibration verification device

1995-12-21

1997-04-01

Raevis, Robert

Measuring and testing

Instrument proving or calibrating

Gas or liquid analyzer

73 106, G01N 2161

Patent

active

056168233

ABSTRACT:
A calibration verification device which eliminates the need for calibration gases to verify the calibration of a capnometer and like devices. The calibration verification device (CVD) provides one or more filters which simulate the infrared absorption of the calibration gases. Each filter comprises a thin film deposition on an infrared transparent substrate, where the thin film deposition has a known infrared absorption characteristic which is designed to match that of the desired calibration gas. Since the filter is not a gas, there is no concern about leakage, and the filter may be used to provide a conceivably infinite number of calibration checks within the predetermined tolerances of the capnometer specifications. The filter is placed in a housing which includes means for accurately positioning the filter in the measurement path of the sensor being calibrated as well as means for protecting the filter from damage. In an illustrative embodiment, a simple push-button mechanism is provided for introducing the filter(s) into the measurement path of the sensor during calibration verification.

REFERENCES:
patent: 3825756 (1974-07-01), Weiss
patent: 4302206 (1981-11-01), Profeta et al.
patent: 5067492 (1991-11-01), Yelderman et al.
patent: 5206511 (1993-04-01), Apperson et al.
patent: 5397541 (1995-03-01), Post

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