超声波H_2O_2在线式浓度计的研制

引　言Ｈ2 Ｏ2 在生产过程中 ,其质量分数变化于 0～52 %之间 ,此变化对Ｈ2 Ｏ2 生产的产量、质量、能源的消耗等技术经济指标都有直接的影响 .Ｈ2 Ｏ2浓度的在线检测一直是Ｈ2 Ｏ2 在生产和控制中的一项难题 .本文通过一套由微机控制的Ｈ2 Ｏ2 在线式超声波浓度计测定了质量分数为 0～ 52 %、温度为 10～50℃的Ｈ2 Ｏ2 溶液的超声波速度 ,计算了超声波速度、温度和浓度间的相互关系 ,为Ｈ2 Ｏ2 溶液浓度的超声在线检测提供了依据 .利用三者关系制成的超声波Ｈ2 Ｏ2 在线式浓度计在生产中取得了良好的测量效果 ,精度优于 0 .5% .1　仪　器超…

DEVELOPMENT OF ON-LINE ULTRASONIC H2O2 CONCENTRATION METER

In this paper,an on-line ultrasonic H2O2 concentration meteroperating according to the relationship between the concentration,temperature and ultrasonic velocity in H2O2 solution is introduced. The ultrasonic velocities in H2O2 solution are measured at different concentrations and temperatures.The velocity-concentration coefficients and velocity-temperature coefficients of H2O2 solution are calculated. In the on-line ultrasonic H2O2 concentration meter,the ultrasonic transducer installed outside the H2O2 solution pipeline generates an ultrasonic wave pulse. The ultrasonic wave travels through the pipeline of H2O2 solution. The computer transfers the ultrasonic travel time into ultrasonic velocity. The platinum resister is installed inside the H2O2 solution pipeline. The resistor variation caused by temperature is sent to the computer through the interface. The computer calculates the ultrasonic velocity and H2O2 temperature by means of velocity-concentration coefficients and velocity-temperature coefficients. It displays and prints the value of the instant H2O2 solution concentration,and meantime displays the 8 hour curve for H2O2 solution concentration variation in the screen. It also can give alarm and output a 4—20 mA analogue signal for automatic control in the production process.