METHOD AND AUTOMATED CALIBRATION SYSTEM FOR GAS ANALYZERS WITH REFERENCE GAS MIXTURES Russian patent published in 2017 - IPC G01C15/02 

FIELD: physics, measurement equipment.

SUBSTANCE: invention refers to measuring equipment, in particular to gas analytical measurements, and can be used to solve the tasks of atmosphere state and composition monitoring. The method of automated calibration of gas detectors includes supply of the standard calibration gas mixture (CGM) to the analyzer alternately with air samples and formation of another calibration gas mixture prior to measurement process - the reference gas mixture (RGM), represented by atmospheric air, and its later supply to the analyzer during measurement alternately with air samples as the calibration gas mixture (CGM). At that during calibration and measurement, control and maintaining of the desired pressure and flow rate of the reference gas mixture reference (RGM), calibration gas mixture (CGM) and air samples is carried out directly on the gas analyzers inlets. Automated gas analyzer calibration system comprises a program-controlled two-position valves installed in the air lines for air flow switching. The system also includes pumps supplying one of the air mixtures sources to the system: air and/or calibration gas mixture samples, as well as cylinders with a known gas mixture ratio: calibration gas mixture (CGM) and cylinder for reference gas mixture (RGM) formation. The system also includes pressure regulators installed in the air lines at the outputs of the said gas mixture sources, and flow controls installed at the gas analyzers inputs. The system includes additional pressure regulators mounted in the air line upstream the said flow regulators to stabilize pressure and flow in the measuring cell of gas analyzer.

EFFECT: invention improves the accuracy of measurement of gas concentration in the atmosphere, such as carbon monoxide (CO), methane (CH₄) and carbon dioxide (CO₂).

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