Design of a Calibration System for Thermal Type Gas Mass Flowmeter Based on 51 Series Single Chip Computer
The precision of flow measurement for hot-film air mass flow meters is affected by gas impurities adhering to the probe and water vapor condensation during a long period,resulting in remarkable errors in flow readings.Especially for importation hot-film air mass flow meters,there is no ability of calibration now in China.For the engine test bench using this type of air mass flow meter,integrated with the responsiveness requirements of flow measurement,a calibration system design scheme for air flow meters based on nonlinear fitting method with 8051 series single chip computer as the core is proposed,which can achieve the calibration on the overproof of flow readings concerning in-use air flow meters.Through testing,the relative error of gas flow calibrated by the calibration system can be controlled within±1%,meeting the relative error requirements of HJ 1014-2020 Technical Requirements for Pollutant Emission Control of Non Road Diesel Mobile Machinery.
Hot-film air mass flow metersSingle chip computerCalibration systemAT89 C52
万方数据
维普
