Gas analyzer calibration checking device
A calibration checking device, and methods of mandating its use at regular time intervals, to ensure maintenance of the accuracy of gas analyzers, especially for use with breath tests. Each calibration checking device is designed to be used for a predetermined number of tests. After first connection of a new calibration checking device, a volume of known calibration checking gas is released into the instrument, and a calibration checking measurement is initiated. A signal is sent to a counting mechanism which both enables the use of the instrument, and commences a count of the number of tests performed by the breath tester. When the number of tests is exceeded, the instrument is disenabled. The device can include a moisture filter having an interface with the instrument, which prevents its operation if the filter is used beyond the recommended number of times, or if excess moisture renders it saturated.
1. A calibration checking device for use with an isotopic gas analyzer, comprising:
a container of calibration gas, said gas comprising at least two gaseous isotopic species; and
at least one mechanism for releasing said calibration gas into said isotopic gas analyzer, said mechanism having interactive control contact with said isotopic gas analyzer.
2. A calibration checking device according to claim 1 and wherein said mechanism comprises a closure valve on said container which is mechanically opened when said container is attached to said isotopic gas analyzer.
3. A calibration checking device according to claim 1 and wherein said container is adapted to be attached to said isotopic gas analyzer by means of a screwed actuator.
4. A calibration checking device according to claim 1 and wherein said container is adapted to be attached to said isotopic gas analyzer by means of a mechanical pushing action.
5. A calibration checking device according to claim 1 and wherein said container comprises a pierceable cover to contain said calibration gas, and said mechanism is adapted to penetrate said cover when said container is attached to said isotopic gas analyzer.
6. A calibration checking device according to claim 1 and wherein said at least two gaseous isotopic species have a predetermined isotopic ratio.
7. A calibration checking device according to claim 6 and wherein said gas analyzer is configured to analyze said calibration gas for the isotopic ratio of said at least two gaseous isotopic species.
8. A calibration checking device according to claim 1 and wherein said mechanism further comprises a signal interface adapted to enable said gas analyzer when said mechanism is actuated.
9. A calibration checking device according to claim 8 and wherein said signal interface is a mechanical interface.
10. A calibration checking device according to claim 8 and wherein said signal interface is an electrical interface.
11. A calibration checking device according to claim 8 and wherein said signal interface is an optical interface.