A Calibration Method for Conductivity Measurement of Solutions Below 10us/cm

A calibration method and conductivity technology, applied in the direction of measuring devices, measuring electrical variables, instruments, etc., can solve the problems of easy distortion of calibration test data and achieve the effect of improving authenticity

Active Publication Date: 2011-12-21
浙江泰林分析仪器有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention provides a relatively reasonable calibration method to solve the problem that the calibration test data is easily distorted in the above-mentioned background technology

Method used

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  • A Calibration Method for Conductivity Measurement of Solutions Below 10us/cm
  • A Calibration Method for Conductivity Measurement of Solutions Below 10us/cm
  • A Calibration Method for Conductivity Measurement of Solutions Below 10us/cm

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Experimental program
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Effect test

Embodiment 1

[0013] The specific steps of the implementation are: use the Mettler-Toledo FiveEasy conductivity meter as the reference conductivity meter, the temperature of the measured liquid is kept at 25±0.1°C, use nitrogen to protect the measured liquid, and the measured liquid is chlorinated by the reference Potassium reagent is prepared, and all containers used are plastic containers without ion dissolution. The water used to prepare the conductivity measurement solution is high-purity water with a resistivity ≥ 18.0MΩcm.

[0014] attached figure 1 The relationship function between conductivity and KCL solution concentration is shown graphically.

[0015] The reference conductivity meter and the conductivity meter measuring equipment simultaneously measure different concentrations of KCL solutions to form a figure 1 curve. figure 1 Among them, series 1 is the conductivity curve measured by the conductivity meter to be calibrated, and series 2 is the conductivity curve measured by t...

Embodiment 2

[0028] According to this embodiment 2: the Mettler-Toledo FiveEasy conductivity meter (supporting electrode is LE740 type) is used as the reference conductivity meter, the temperature of the measured liquid is kept constant at 25 ± 0.1 ° C, and the measured liquid is protected by nitrogen gas. The test solution is prepared from the standard potassium chloride reagent, and all the containers used are plastic containers without ion dissolution. The water used to prepare the conductivity measurement solution is high-purity water with a resistivity ≥ 18.0MΩcm.

[0029] attached image 3 The relationship function between conductivity and KCL solution concentration is shown graphically. Series 1 is the conductivity curve measured by the reference conductivity meter, series 2 is the conductivity curve measured by the conductivity meter to be calibrated, and series 3 is the conductivity curve measured by the conductivity measuring equipment after calibration.

[0030] According to th...

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Abstract

The invention relates to a calibration method used for measuring solution conductivity lower than 10mus / cm, which aims to solve the problem that the existing algorithm easily causes conductivity calibration curve deviation and wrong conductivity indication. The invention includes a reference conductivity meter and a calibration device of a processor, and is realized in the following steps: the conductivity of 1*10<-5>mol / L potassium chloride solution is measured through a conductivity measurement device and the reference conductivity meter, and is recorded as a calibration point; and the conductivity of 3*10<-5>mol / L potassium chloride solution is measured through the conductivity measurement device and the reference conductivity meter and is used as another calibration point. Moreover, at least one algorithm in the measurement of the steps is used for revising the conductivity measurement device.

Description

technical field [0001] The invention relates to a method for calibrating the conductivity of a solution, especially a calibration method for measuring the conductivity of a solution lower than 10 us / cm. Background technique [0002] Measurements of the conductivity of solutions must be calibrated periodically. In the existing technology, the commonly used calibration method for conductivity is to calibrate the cell constant through a calibration solution. Specifically, a specific electrode with a temperature sensor is immersed in the measured liquid to generate a deformation of the measurement signal, which is detected through the execution of a complex set of algorithms. However, this calibration method is likely to cause deviations in the calibration curve: on the one hand, using this method to calibrate the conductivity of solutions with a conductivity range of 0.055-200us / cm or even higher values, if the conductivity is 200us / cm or 84us / cm Calibrate for the points, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R35/00
Inventor 叶大林夏信群
Owner 浙江泰林分析仪器有限公司
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