Portable smart water quality conductive detection device

A conductivity detection, portable technology, applied in the direction of material resistance, etc., can solve the problem of low measurement accuracy, and achieve the effect of high measurement accuracy and convenient operation

Inactive Publication Date: 2007-03-14
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Once this type of conductivity electrode is contaminated, corro

Method used

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  • Portable smart water quality conductive detection device
  • Portable smart water quality conductive detection device
  • Portable smart water quality conductive detection device

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Embodiment Construction

[0018] As shown in Figure 1, the portable intelligent water quality conductance detection device has a single-chip microcomputer, and the single-chip microcomputer is respectively connected with a square wave generator, a temperature sensor, a keyboard, a display, a multi-way selection switch, and an A / D converter. The temperature sensor is connected with the conductance cell, the signal amplifier, the capacitor filter, the multiplex switch and the A / D converter in turn. The details of each part of the circuit are as follows:

[0019] The LM555 chip is connected into a multivibrator to generate an AC square wave with a frequency f = 250Hz. A voltage follower (LM258) reduces the input impedance of the conductivity cell and improves signal stability. Capacitor filtering eliminates the effects of multiple harmonics. The temperature compensation link uses a thermistor NTC and an operational amplifier bridge, and the NTC is integrated with the electromagnetic induction conductivi...

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Abstract

The disclosed portable intelligent conductance detector for water quality comprises a SCM connected with a keyboard and a display; a square wave generator connects with a voltage follower, a conductance cell, and an operational amplifier bridge; and a temperature sensor connects with a conductance cell, a signal amplifier, and a capacitor filter. Wherein, every of former members also connect with a multiplex selection switch and an ADC. This invention integrates different technologies, and is convenient and high precise for wide application.

Description

technical field [0001] The invention relates to a portable intelligent water quality conductance device, which belongs to the technical field of water quality measuring instruments. Background technique [0002] With the intensification of environmental pollution and the development of sewage treatment technology, water quality testing is becoming increasingly important in modern industrial and agricultural production. The currently produced water quality conductivity meters are usually powered by an AC power supply, which is too bulky and inconvenient to carry. For the conductivity sensor of the conventional electrode type conductivity meter, the conductivity electrode usually has two parallel platinum plates embedded on the glass, and two wires are drawn from the platinum plate to connect with the data processing unit of the instrument. Once this type of conductivity electrode is polluted, corroded, or scaled, its measurement accuracy will be greatly reduced. The conduct...

Claims

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Application Information

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IPC IPC(8): G01N27/06
Inventor 安庆敏吴明光吴巍
Owner ZHEJIANG UNIV
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