用环形孔板节流模型对注汽井吸汽剖面的压力、流量、干度、温度进行了分析，以汽液两相流分相理论导出了仪器的测量原理公式．在此基础上，着重就与该仪器配套的压力、差压组合式传感器及系统的设计、研制进行了较详细描述，展示了该仪器现场测试的一些典型结果 The pressure, the flow rate, the dryness and the temperature of the steam suction cross section of the steam injection well were analyzed with the annular orifice throttling model, and the measuring principle formula of the instrument was derived based on the phase theory of vapor - liquid two - phase flow. On this basis, focusing on the instrument with the pressure, differential pressure combination of sensors and system design, development carried out a more detailed description of the instrument shows some of the typical field test results