A new design of inductive conductivity sensor for measuring electrolyte concentration in industrial field

Fig. 1 Principle of TICS. [Display omitted] •We suggest extended model of TICS, which matches well with reality.•Extended model includes equivalent loss resistance and mutual coupling factor.•Virtual short of sensing amplifier eliminate the affection of permeability change.•We design sensor structur...

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Bibliographic Details
Published in:Sensors and actuators. A. Physical. 2020-01, Vol.301, p.111761, Article 111761
Main Authors: Kang Hui, Song, Jang, Hyon, Kim Gum, Chol, Yu Song, Chol, Kim Yong, Hyok
Format: Article
Language:English
Subjects:
Conductivity
Conductivity sensor
Contactless
Dynamic control
Electrolytes
Inductive
Magnetic cores
Magnetic permeability
Mutual coupling
Permeability
Recovery time
Seawater
Sensitivity
Sensors
Sodium hydroxide
Sulfuric acid
Toroidal
Transformers
Water quality
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Summary:Fig. 1 Principle of TICS. [Display omitted] •We suggest extended model of TICS, which matches well with reality.•Extended model includes equivalent loss resistance and mutual coupling factor.•Virtual short of sensing amplifier eliminate the affection of permeability change.•We design sensor structure, hardware and software of new sensing module.•We compared new module with a commercial water quality meter F-74 (Horiba, Japan). We have presented an extended model to analyze the characteristics of transformer type inductive conductivity sensor (TICS) and described a new sensor design based on it. The model contains equivalent loss resistances (R1 and R4) and mutual coupling factors (k12 and k34) of two transformers. With studying on this model, we have confirmed to be able to improve the sensing performance with a proper design of signal receiver and prefer virtual short method to the repeater one. Based on this virtual short method, we have designed a new sensor module and tested it with several corrosive solutions such as sulfuric acid, sodium hydroxide and sea water. And the sensing data have been hardly affected by the permeability change of magnetic cores. The drive voltage amplitude dynamic control method can improve the sensitivity in low measuring range and expand the measuring range. The sensitivity, response, recovery time, stability and comparison with a commercial water quality meter F-74 (Horiba, Japan) were evaluated.
ISSN:0924-4247
1873-3069
DOI:10.1016/j.sna.2019.111761