Low-power-consumption self-diagnosis wide-range gas flow measuring circuit

• Main Authors: LIN JINGDIAN, ZHANG SHENGYI, HUANG XIANGKE, HUANG CHAOCHUAN
• Format: Patent
• Language: Chinese; English
• Published: 21.12.2016
• Subjects: MEASURING; MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUIDLEVEL; METERING BY VOLUME; PHYSICS; TESTING

The invention discloses a low-power-consumption self-diagnosis wide-range gas flow measuring circuit. According to large flow, a Welgon sensor is adopted for detecting rotation of a roots, and pulses are generated to calculate accumulated flow. When small flow is measured, a bridge circuit composed of four platinum resistors is adopted, changes of voltage in a bridge circuit are calculated, and the flow of gas is converted. The temperature and pressure of a pipeline are obtained through a temperature senor and a pressure sensor, measurement data is compensated for, and standard state flow is obtained. Due to the fact that when the platinum resistors are adopted for measuring the small flow of gas, the influence from gas components is large, the measurement result of the platinum resistors can be subjected to online correction within the overlapped measurement range of two measurement circuits according to the flow measurement result of the platinum resistors, the precision of gas small flow measurement is imp