频率对电磁浓度计性能的影响  

The Performance of the Electromagnetic Concentration Meter is Affected by Frequency

作　　者：李永和[1] 

机构地区：[1]天津大学

出　　处：《仪器仪表学报》1990年第1期40-46,共7页Chinese Journal of Scientific Instrument

摘　　要：电磁浓度计实质上是一种无电极式电导率仪,这种仪器通过测量耦合在一对绕组变压器上的溶液闭合回路中的电流测量溶液电导率。在这里不存在与溶液接触的电极。该仪器可精确测定电导率,也可精确而可靠地测量各种百分化学浓度。本文给出了仪器的工作原理表达式,讨论了激磁电压频率对仪器线性和灵敏度的影响。The electromagnetic concentration meter essentially is a electrod-eless conductivity meter.The meter determines solution conductivity by mea-ns of measuring the current in a closed loop of a solution which couples wi-th a pair of toroidel transfomer coils,in this way,there is no electrode wh-ich contracts with the solution.The meter can measure linear conductivityacc urately,in addition,various percentages of chemical concentration can bemeasured accurately and reliably.In this paper,the theoretical expression of the detector for the meter isdeduced on the basis of the principle of ideal transformer and is linearizedunder certain condition.The results of the experiments are in agreement withthe linearized expression and so the expression is reliable.Moreover,the res-ults show that selecting adequate frequency is aeffective way of improvingsensitivity and linearity of the detector.

关 键 词：电磁浓度计 电导率仪 频率 性能 

分 类 号：TH832.11[机械工程—仪器科学与技术]