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Electrode for measuring trace dissolved oxygen

A dissolved oxygen and electrode technology, applied in measuring devices, material analysis by electromagnetic means, instruments, etc., can solve the problems of small electrode effective area of ​​electrodes, short electrode working life, small surface area of ​​lead electrodes, etc., and achieve a small effective area. , The effect of low cost and short service life

Inactive Publication Date: 2009-08-05
吴守清 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of polarographic electrodes are: 1. Compared with the measurement of trace dissolved oxygen, the sensitivity of the electrode is low, and the output signal is small; 2. The effective area of ​​the electrode is small, and it is easy to occupy dirt; The internally charged electrolyte is easy to consume and needs to be replenished, and it is very difficult to install the electrodes after replenishment
The disadvantages of the primary battery electrode are: 1. The surface area of ​​the lead electrode is small, and the surface of the lead electrode will be completely covered by lead dioxide soon, that is, the working life of the electrode is short; 2. The sensitivity of the electrode is low, and the output signal is small

Method used

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  • Electrode for measuring trace dissolved oxygen
  • Electrode for measuring trace dissolved oxygen

Examples

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Effect test

Embodiment 1

[0030] An electrode for measuring trace dissolved oxygen, including cable pipe joint 1, cable sealing O-shaped rubber ring 2, electrode frame 16, lead anode 9, silver cathode 8, electrolyte 10, polymer film 7, and tight O-shaped rubber ring 6. Cylindrical ring 12, electrolyte sealing O-shaped rubber ring 110, fixed bolt 11, cable pipe joint 1 is a hollow nut made of PE material, and the bolt post of this nut is shaped on the first screw thread 25. The central portion of the cap of the nut has a first cable hole 24, the electrode frame 16 contains an electrode lead-out tube 160 and an electrode holder 161, the electrode lead-out tube 160 is a circular tube made of PE material, the two ends of the tube The inner wall of the end is respectively shaped on the third screw thread 165 and the fourth screw thread 164. There is a circular separator separating the inside of the tube into two parts in the tube, and a hole through the two parts is opened in the center of the separator. Th...

Embodiment 2

[0032] This embodiment has the same figure 1 and figure 2 The structure shown is exactly the same structure. Except for the following technical features, the remaining parts are exactly the same as in Embodiment 1: the epoxy resin 5 has flowable silicone rubber 50 and cured silicone rubber 51 in sequence.

Embodiment 3

[0034] Except also including following key technical data, all the other parts are identical with embodiment 1:

[0035] The diameter and length of the spongy lead cylinder 15 are 12mm and 37mm respectively;

[0036] The diameter and the length of lead anode 9 are respectively 2mm and 45mm, and its one end stretches out 3mm from the bottom surface of described cylindrical pit, and its other end stretches out 32mm from the end face of the other end of described electrode holder 161;

[0037] The outer diameter of the silver cathode 8, wall thickness and length are 16mm, 1.2mm and 43mm respectively;

[0038] The silver wire 22 has a diameter of 0.5 mm.

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Abstract

An electrode for measuring micro dissolved oxygen belongs to the technical field of electrochemical sensors. On the basis of the original battery type electrodes, the electrode adopts a spongy-shaped lead as the positive electrode so as to greatly increase the effective area of the positive electrode and enable the surface and the interior of the positive electrode to both react with oxygen molecules of the dissolved oxygen, thereby greatly prolonging the service life of the electrode, increasing the sensitivity of the electrode to the oxygen molecules and outputting large and stable signals under the condition of measuring the micro dissolved oxygen; with output current being three magnitudes larger than a traditional electrode, the electrode has the advantages of high capacity of resisting disturbance, stable performance, good reproducibility, convenient use, less electrode maintenance, and the like, and is particularly suitable for measuring or on line monitoring the micro dissolved oxygen in water fed to a boiler in a heat power station or nuclear power station.

Description

technical field [0001] The invention relates to an electrode for measuring trace amounts of dissolved oxygen, which belongs to the technical field of electrochemical sensors. Background technique [0002] The content of dissolved oxygen in the boiler feed water and condensate water of the power plant are both trace level, the former is in the range of several μg / L, and the latter is in the range of ≤30μg / L. This is a necessary condition to prevent boilers and condensers from being corroded when working under high temperature and high pressure. Before the above-mentioned water enters the boiler and condenser, it must first enter the deaeration equipment for deaeration, and the amount of deaeration chemicals put into the deaeration equipment must be monitored by a dissolved oxygen analyzer. Dissolved oxygen analyzers are indispensable instruments in power plants. [0003] At present, the electrodes for measuring trace dissolved oxygen used in domestic and foreign dissolved o...

Claims

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Application Information

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IPC IPC(8): G01N27/406
Inventor 吴守清吴立敏
Owner 吴守清
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