CN2439024Y

CN2439024Y - Coulobmeter for COD on-line monitoring instrument

Info

Publication number: CN2439024Y
Application number: CN 00228626
Authority: CN
Inventors: 石平; 孙宗光; 何广田
Original assignee: GUANGZHOU CITY YIWEN TECHNOLOGY Co Ltd
Current assignee: GUANGZHOU CITY YIWEN TECHNOLOGY Co Ltd
Priority date: 2000-06-28
Filing date: 2000-06-28
Publication date: 2001-07-11
Anticipated expiration: 2010-06-28

Abstract

The utility model relates to a coulometer for a COD on-line monitoring instrument, which is composed of a coulometer 1, a magnetic stirrer 3 with a stirring object 2, a positive electrode 4, a negative electrode 5 and a power supply 6, wherein, a set of relay sets 7 controlled by a single-chip microcomputer is arranged between the power supply 6 and the positive electrode 4 and the negative electrode 5. The coulometer in the structure of the utility model cleans the electrolytic electrode plates by making use of the inverse electrolytic principle, the operating condition is intelligently controlled by the single-chip microcomputer, and therefore, the utility model effectively solves the work of automatically cleaning the electrodes of the coulometer for the unattended monitoring instrument to guarantee the effective continuous operation of the COD on-line monitoring instrument.

Description

The coulombmeter that is used for COD on-line monitoring instrument

A kind of coulombmeter that is used for COD on-line monitoring instrument relates to the improvement of coulombmeter control device.

When containing chlorion in the waste water, constitute traditional coulombmeter the electrolysis material platinum will with chlorion generation chemical reaction, thereby on the interface between electrolytic solution and the electrode, produce some reactive materials.When these chemical substances accumulated to some, electrode surface stoped the chemical reaction in the coulombmeter to be proceeded by the shinny black that becomes of silver-colored light simultaneously, and the data that make it to be measured produce error.At this moment people can only stop the work of coulombmeter, and electrode is extractd, and immerse to clean reduction in the ammoniacal liquor pond.In unattended automatic online monitoring instrument, it then is unpractical adopting this manual reduction mode.

The purpose of this utility model, the coulombmeter that provides a kind of COD of being used for on-line monitoring instrument to use is provided, utilize the back-electrolysis principle to realize that the instrument self-timing stops detection and transfers electrode is cleaned, reach in official hour the sediment on the electrode is cleaned, guarantee normally carrying out of titrimetry.

The utility model is to implement like this: in the coulombmeter of being made up of magnetic stirring apparatus 3, positive electrode 4, negative electrode 5 and the power supply 6 of coulomb pond 1, band stirrer 2, it is characterized in that being added with one group by monolithic processor controlled relay group 7 between power supply 6 and positive electrode 4, negative electrode 5.

Below in conjunction with accompanying drawing in detail the said structure of the utility model is described in detail.

Fig. 1 is the coulombmeter structural representation of the COD of being used for on-line monitoring instrument described in the utility model.

As shown in Figure 1, the coulombmeter of the COD of being used for on-line monitoring instrument described in the utility model is at the coulombmeter formed of magnetic stirring apparatus 3, positive electrode 4, negative electrode 5 and power supply 6 by coulomb pond 1, band stirrer 2, is added with one group of relay group 7 of being controlled by singlechip CPU and forms between power supply 6 and positive electrode 4, negative electrode 5.Wherein, connect the relay A coil 8 that links to each other with negative electrode 5 from one group of I/O interface that a pin of single-chip microcomputer is drawn, draw one group of I/O interface pilot relay B coil 9 from the b pin of single-chip microcomputer, two contacts of relay A make both positive and

negative polarity

4,5 suitable the connecing of the both positive and negative polarity and the coulombmeter of power supply 6, promptly anodal to positive pole, the negative pole anticathode; Two contacts of relay B make both positive and

negative polarity

4,5 reversal connections of the both positive and negative polarity and the coulombmeter of power supply 6, and promptly anodal anticathode, negative pole constitute whole loop to positive pole with this.

The coulombmeter that is used for COD on-line monitoring instrument of structure described in the utility model is work like this:

Coulombmeter is divided into mensuration state, cleaning state and three kinds of duties of halted state:

1, at the mensuration state; Single-chip microcomputer a human hair combing waste goes out signal and the b pin does not signal, 8 energisings of relay A coil and relay B coil 9 no powers, so have only two closings of contact of relay A, power positive cathode and coulombmeter positive and negative electrode are suitable to be connect, and coulombmeter enters the titration determination state;

2, at the cleaning state; Single-chip microcomputer a pin does not signal and the b human hair combing waste goes out signal, relay A coil 8 no powers and 9 energisings of relay B coil, then have only two closings of contact of relay B, power positive cathode and the reversal connection of coulombmeter positive and negative electrode, coulombmeter enters back-electrolysis cleaning state.Whether coulombmeter enters this state, fully by the artificial program decision of setting in the single-chip microcomputer, be generally per fortnight once, each self-timing that only needs can be removed the accumulation that turns black on the electrode in 3-5 minute, recover the shinny true qualities of electrode silver light, make the scope that precision returns to regulation of measuring.Then automatically enter the mensuration state once again;

3, in halted state; Single-chip microcomputer a pin does not signal and the b pin does not also signal, relay A coil 8 no powers and relay B coil 9 be no power also, so all contacts of relay group disconnect, power positive cathode and coulombmeter positive and negative electrode disconnect, coulombmeter can not get electric charge, electrolytic reaction stops, and coulombmeter is in halted state.

Adopted the said structure of the utility model, utilize the back-electrolysis principle, add by the Based Intelligent Control of computing machine, solved the work that the coulombmeter of this unattended monitor cleans electrode automatically effectively, guaranteed effective continuous working of COD on-line monitoring instrument its duty.

Claims

1, a kind of coulombmeter that is used for COD on-line monitoring instrument, magnetic stirring apparatus (3), positive electrode (4), negative electrode (5) and power supply (6) by coulomb pond (1), band stirrer (2) are formed, it is characterized in that between power supply (6) and positive electrode (4), negative electrode (5), be added with one group and form by monolithic processor controlled relay group (7).

2, the coulombmeter that is used for COD on-line monitoring instrument according to claim 1, it is characterized in that one group of I/O interface pilot relay A coil (8) of drawing from a pin of said single-chip microcomputer, one group of I/O interface pilot relay B coil (9) of drawing from the pin of single-chip microcomputer, two contacts of relay A make suitable the connecing in both positive and negative polarity (4), (5) of the both positive and negative polarity and the coulombmeter of power supply (6), and two contacts of relay B make both positive and negative polarity (4), (5) reversal connection of the both positive and negative polarity and the coulombmeter of power supply (6).