Risk and Control of the Computerized Correction Method for Measuring Characteristics of Intelligent Water Meter

姚　灵1，2

(宁波水表股份有限公司1，浙江 宁波　315032；浙江省水表研究院2，浙江 宁波　315032)



智能水表测量特性计算机校正方法的风险与控制

Risk and Control of the Computerized Correction Method for Measuring Characteristics of Intelligent Water Meter

姚灵1，2

(宁波水表股份有限公司1，浙江 宁波315032；浙江省水表研究院2，浙江 宁波315032)

摘要：所有含嵌入式计算机系统和电子显示器的智能水表都要涉及智能水表流量测量特性的计算机校正。校正方法的推广应用将会有效地改善叶轮、超声、电磁、射流式等流量传感器因原理的或非原理的非线性输入-输出特性造成的使用范围变窄、测量误差超差的问题。在选用校正方法和对成批出厂产品校正时，会存在由于校正不当或产品特性发散而出现的质量风险，可通过制定校正技术规范等方法控制。

关键词：智能水表流量传感器仪器仪表信号处理误差校准风险控制

Abstract：All the intelligent water meters containing embedded computer system and electronic display are involving computerized correction for flow measurement characteristics of the intelligent water meters.The popularization and application of the correction method effectively improve the problems of usable scope becoming narrow and measurement error being out-of-tolerance for vane,ultrasonic,electromagnetic and fluidic flow sensors,caused by principle or the non-principle nonlinear input-output characteristics.In selecting correction methods,and correcting batch manufactured products,the quality risks may exist because of improper correction or diverging product characteristics,these risks may be controlled through formulating technical specifications of correction.

Keywords:Intelligent water meterFlowSensorInstrumentationSignal processingErrorCalibrationRisk control

0引言

水表流量测量特性的计算机校正是智能水表的一项重要核心技术[1]。通过这项技术，可以对智能水表流量测量特性的非线性部分作出数字化校正，使其在测量范围内的示值误差符合标准的要求[2-3]。

智能水表流量测量特性主要由传感器特性决定，常见的传感器有叶轮式、超声式、射流式和电磁式等。当测量范围拓宽时，这些传感器就会表现出明显的非线性[4]。 采用嵌入式计算机校正智能水表非线性特性的方法有很多，但要证明校正后水表在流量测量范围内的示值误差均落在期望区间内，需要建立一套科学的评判标准和方法，进行有效识别和确认。……