METHOD OF TESTING GAS ANALYTICAL SENSORS FOR OPERATION SPEED WITH RESPONSE TIME OF LESS THAN 4 SECONDS

摘要

FIELD: instrumentation technology.;SUBSTANCE: change of control of gas mixtures with different preset concentrations of the controlled component on the sensor element of the gas analytical sensor is carried out in dynamic mode at constant and equal, equal to the predetermined, consumptions from different sources of control gas mixtures with different preset concentrations of the controlled component. Change of gas mixtures with different preset concentrations of the controlled component on the sensor element of the gas analytical sensor and achievement of stabilisation of the output signal of the sensor, corresponding to the level of concentration of the controlled component on the sensor element of the gas analytical sensor is provided at equal parameters of the control gas mixtures and for minimum time which is easily calculated and taken into account in determining the operation speed of the gas analytical sensor. This ensures accuracy of determining of the operation speed of the gas analytical sensor. Use of the dynamic mode of feeding the first gas mixture, as well as change of the first gas mixture to the second gas mixture during the testing of the gas analytical sensor enables to stabilise faster the predetermined concentration of the controlled component on the sensor element of the gas analytical sensor and thus to ensure the constancy of pressure and composition of gas mixtures on the sensor element of the sensor, which increases the accuracy of evaluation of its operation speed. With this mode of feeding the gas mixtures the performance data of the gas reducers on the sources of feeding the control gas mixtures remain dynamic and do not affect the process of feeding the stable gas mixture at program switches of the valves.;EFFECT: increase in reliability of determining the operation speed of the gas analytical sensor by feeding to the sensor element of the gas analytical sensor of control gas mixtures stable in composition and pressure in dynamic mode.;3 cl, 4 dwg