关键词: 电导率仪, 校准, 不确定度, 温度补偿

Abstract: [Objective] In response to the specific requirements for conductivity meter calibration in dairy production processes,this paper proposed a novel calibration method with strong applicability,and systematically analyzed the current application status and development prospects of conductivity meters in the dairy industry. [Method] Based on a dedicated verification device for conductivity meters,the uncertainty of the indicated error of the conductivity meter was evaluated within the measuring range of 5×10^-2 to 2×10⁵ μS/cm. In accordance with the requirements of the JJG 376—2007 verification regulation,standard solutions were used for electrode constant calibration,and calibration tests were carried out under both compensated and uncompensated modes in conjunction with temperature compensation parameters. [Result] The relative expanded uncertainty of the verification device within the measuring range was U_rel=0.32% (k=2),with the uncertainty component introduced by repeatability measurements u₁= 0.026%,the uncertainty component introduced by the standard solution u₃=0.125%,and the combined standard uncertainty of 0.16%. On this basis,a set of operational specifications for calibrating conductivity meters tailored to the dairy industry was preliminarily established,and a simple and feasible calibration testing method was proposed. [Conclusion] This research provides effective technical support for the verification and calibration of conductivity meters used in dairy manufacturing processes. Furthermore,by integrating application scenarios such as raw milk inspection,production process monitoring,CIP cleaning control,and information system integration,it systematically elucidates the extensive application value of conductivity meters in ensuring dairy quality and process stability.

Key words: conductivity meter, calibration, measurement uncertainty, temperature compensation