电导率仪检定规程

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1、电导率仪检定规程目录1范围····································································(1)2引用文献·······························································(1)3术语和计量单位··························································(1)4概述·····································

2、······························(2)5计量性能要求···························································(2)5.1电子单元重复性······················································(2)5.2电子单元引用误差······················································(2)5.3电导池常数示值误差···············

3、····································2)5.4温度系数示值误差····················································（2)5.5温度测量示值误差·····················································(2)5.6仪器引用误差·······················································(2)5.7仪器的重复性·················

4、········································(2)6通用技术要求···························································（4)7计量器具控制···。·······················································4)7.1检定条件····························································(4)7.2检定项目·······

5、····················································(5)7.3检定方法··························……:···························(5)7.4检定结果的处理······················································(8)7.5检定周期····························································(8)附录A电导率

6、标准溶液浓度及其电导率值····································(9)附录B电导率仪检定记录示例············································(10)附录C检定证书内页格式示例·············································(12)1、范围本规程适用于电解质电导率仪的首次检定、后续检定和使用中检验，电阻率仪和基于电导率测量原理的盐度计和总溶解固体含量（TDS）测量仪的校准可参照执行。1、引用文献2、术语和计量

7、单位3.1（电解质溶液的）电导电导池中电解质溶液的例子电荷移动时。电流和电势差的比值G=IU（1）式中：G—电导，SI—通过电解质溶液的电流，A；U—电极间的电势差，V电阻是电导的倒数，单位是Ω3.2（电解质溶液的）电导率电解质溶液电导率用以下公式定义：K=jE（2）式中：k—电导率SJ—电流密度AE—电场强度V电阻率是电导率的倒数，单位是欧姆米（Ωm）3.3电导池常数电导池常数由公式（3）计算Kcell=lA（3）式中：Kcell—电导池常数，l—测量电极间的有效距离，mA—电极间液注的有效横截面积，m2。由于电导池的有

8、效几何参数难以直接测量，一般通过测量电导率准确已知的标准物质的电导，用相对测量方法确定电导池常数。电导池常数、电导与电导率有以下关系:K=KcellG(4)注:通常电导池常数在一定范围内有恒定的值，超出这个范围，电极极化效应或其他效应可能使电极常数发生变化。3.4温度系数temperaturecoeff