CN203037617U - Dissolved oxygen detection device and dissolved oxygen detector - Google Patents
Dissolved oxygen detection device and dissolved oxygen detector Download PDFInfo
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- CN203037617U CN203037617U CN 201320003830 CN201320003830U CN203037617U CN 203037617 U CN203037617 U CN 203037617U CN 201320003830 CN201320003830 CN 201320003830 CN 201320003830 U CN201320003830 U CN 201320003830U CN 203037617 U CN203037617 U CN 203037617U
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Abstract
The utility model discloses a dissolved oxygen detection device and a dissolved oxygen detector. The dissolved oxygen detection device comprises a polarographic dissolved oxygen electrode, an electrode exciting unit and a capacitor, wherein the electrode exciting unit is connected with a power supply through the capacitor. The dissolved oxygen detector comprises a circuit board and a sealed casing with two interfaces, wherein the dissolved oxygen detection device is arranged on the circuit board which is fixed in the sealed casing. The polarographic dissolved oxygen electrode of the dissolved oxygen detection device is arranged on one interface of the sealed casing, and the other interface of the sealed casing is used for being connected with the power supply. According to the dissolved oxygen detection device and the dissolved oxygen detector, the excited state of the polarographic dissolved oxygen electrode is kept through the additionally arranged capacitor so that repeated exciting is not needed, dissolved oxygen measuring time is greatly shortened, and dissolved oxygen measuring efficiency is greatly improved.
Description
Technical field
The utility model relates to a kind of dissolved oxygen DO pick-up unit and dissolved oxygen DO detector.
Background technology
Along with the development of society, environmental problem more and more is subjected to people's attention, particularly water pollution problems, and wherein how much oxygen in water content is an important indicator weighing water quality.Natural oxygen in water is close to saturation value, and microbial reproduction is vigorous in the water; When water body was subjected to organism and reducing substances pollution, dissolved oxygen concentration will descend.When dissolved oxygen depletion speed greater than air in the dissolution velocity of oxygen in the water, oxygen in water concentration goes to zero, this moment, anaerobion was bred, and water body was worsened, so dissolved oxygen concentration can reflect the contaminated degree of water quality.Simultaneously, for culture fishery, oxygen in water also has fundamental influence to the growth of fish etc.When dissolved oxygen DO is lower than 4mg/L, will cause fish death by suffocation.For the mankind, dissolved oxygen content must not be less than 6mg/L in the healthy potable water.Therefore, the measurement of water body dissolved oxygen content, all significant for development of industry and agriculture.
At present, the dissolved oxygen sensing method mainly contains iodimetric titration, optical fiber method, fluorescence method and current measurement method.Iodimetric titration is pure chemical method, is not suitable for doing online detecting/monitoring.Optical fiber method and fluorescent process complexity, the cost height.
The current measurement method mainly is to adopt polarogram formula dissolved oxygen electrode, polarogram formula dissolved oxygen electrode is by negative electrode, anode, KCL(potassium chloride) electrolytic solution and oxygen diffusion membrane form, add the excitation of 0.685V DC voltage at anode, oxygen diffuses into electrolytic solution and Au(gold by film) electrode and Ag(silver) electrode formation metering circuit, negative electrode can be exported the weak current signal that is the nA level of proportionate relationship with oxygen concentration.
So by adding DC voltage voltage at electrode anode as excitation, electrode cathode can be exported the weak current of nA level.Current measurement method measuring principle is simple, and the precision height still, needs to have intensifying of 4 ~ 6h normally to use after the outage of polarogram formula dissolved oxygen electrode.
The utility model content
The technical problems to be solved in the utility model is that to intensify the time again long for the polarogram formula dissolved oxygen electrode that overcomes prior art, the defective of the Measuring Time that causes and measurement mechanism waste service time, a kind of dissolved oxygen DO pick-up unit and dissolved oxygen DO detector are provided, keep the excited state of described polarogram formula dissolved oxygen electrode by increasing capacitor, thereby avoid repeating to intensify the time waste that causes.
The utility model solves above-mentioned technical matters by following technical proposals:
The utility model provides a kind of dissolved oxygen DO pick-up unit, for detection of the dissolved oxygen DO in the water body, described dissolved oxygen DO pick-up unit comprises a polarogram formula dissolved oxygen electrode and an electrode excitation unit, be characterized in, described dissolved oxygen DO pick-up unit also comprises a capacitor, and described electrode excitation unit inserts a power supply by described capacitor.
Keep the supply voltage of the electrode excitation unit that offers the described polarogram formula dissolved oxygen electrode of excitation in the utility model by capacitor, even thereby outage also can be kept the excited state of described polarogram formula dissolved oxygen electrode, thereby saved the time that repeats to intensify polarogram formula dissolved oxygen electrode.
The electrode excitation unit that wherein said polarogram formula dissolved oxygen electrode and be used for intensifies it is prior art device commonly used, so no longer its 26S Proteasome Structure and Function is given unnecessary details herein.
Preferably, described dissolved oxygen DO pick-up unit also comprises a processor, one current-to-voltage convertor, one AD converter and a communication interface, wherein said polarogram formula dissolved oxygen electrode, current-to-voltage convertor, AD converter, processor and communication interface are electrically connected successively, described current-to-voltage convertor is used for the current signal of the sign dissolved oxygen DO of described polarogram formula dissolved oxygen electrode generation is converted into analog voltage signal, described AD converter is used for described analog voltage signal is converted to digital signal, and described processor transfers to external unit with described digital signal by described communication interface.
Dissolved oxygen DO in the water body that by AD converter and current-to-voltage convertor described polarogram formula dissolved oxygen electrode need be detected in the utility model transforms the current signal that obtains and is converted into digital signal, and then is convenient to subsequent treatment.But also transmit it to external unit by communication interface, thereby be convenient to further described digital signal be handled.Wherein said processor, current-to-voltage convertor, AD converter and communication interface are components and parts known in the technology, so no longer function and the structure of described components and parts is described herein.
Preferably, described dissolved oxygen DO pick-up unit also comprises a temperature sensor that is electrically connected with described processor, described temperature sensor is gathered the temperature of described processor, described processor carries out temperature compensation based on the temperature of described temperature sensor collection to described digital signal, and the digital signal after the temperature compensation is transferred to external unit by described communication interface.
The temperature compensation operation of processor described in the utility model is signal compensation technology commonly used in the prior art, so no longer it is given unnecessary details, and those skilled in the art can also adopt different parts and different temperature compensation modes according to the concrete configuration of device and the kind of parts herein.
Preferably, described communication interface is a kind of serial physical interface standard that RS485 interface (proposed standard 485 interfaces, the EIA(Electronic Industry Association of EIA) is formulated).In addition, those skilled in the art can also adopt different communication interfaces according to actual needs, are not limited in described RS485 interface.
Preferably, also be serially connected with an amplifier between described AD converter and the described current-to-voltage convertor, described amplifier is used for amplifying the analog voltage signal of described current-to-voltage convertor output.Further make the simulating signal of described current-to-voltage convertor output directly to be handled by follow-up components and parts by amplifier in the utility model.
Preferably, described dissolved oxygen DO pick-up unit also comprises a voltage follower, and described voltage follower is serially connected with between described polarogram formula dissolved oxygen electrode and the electrode excitation unit.
The utility model completely cuts off signal cross-talk between described polarogram formula dissolved oxygen electrode and the electrode excitation unit by voltage follower, improve accuracy of detection, wherein said voltage follower is the isolated means of undesired signal that those skilled in the art use always, so no longer the 26S Proteasome Structure and Function of voltage follower is given unnecessary details herein.
Preferably, described voltage follower is an operational amplifier, and the enlargement factor of wherein said operational amplifier is 1.That is to say, when the enlargement factor of amplifier is 1, input voltage and output voltage big or small consistent is so the function that this moment, described operational amplifier the was realized function of voltage follower just is that 1 operational amplifier comes voltage follower the most so adopt enlargement factor in the utility model.
Preferably, described dissolved oxygen DO pick-up unit also comprises a diode, and the anode of described diode inserts described power supply, and the negative electrode of described diode is connected with described capacitor electrode.The utility model utilizes the one-way of diode, and when making outage, described capacitor only can be powered to the electrode excitation unit.
The utility model also provides a dissolved oxygen DO detector, be characterized in, described dissolved oxygen DO detector comprises a circuit board and the seal casinghousing with two interfaces, and described circuit board is provided with aforesaid dissolved oxygen DO pick-up unit, and described circuit board is fixed in the inside of described seal casinghousing;
The polarogram formula dissolved oxygen electrode of described dissolved oxygen DO pick-up unit is located at an interface of described seal casinghousing, and another interface of described seal casinghousing is used for connecting described power supply.
Preferably, described interface is hickey, and described polarogram formula dissolved oxygen electrode is arranged at a hickey, and described power supply is connected to another hickey by a cable.
Preferably, be filled with cylinder seal glue in the screw thread of described hickey.That is to say, in order to have better leakproofness after the threaded engagement, fill slit in the interlock rear thread by cylinder seal glue in the utility model.Wherein said cylinder seal glue is encapsulant commonly used in the prior art, and those skilled in the art can use the cylinder seal glue of any kind to fill hickey of the present utility model.
On the basis that meets this area general knowledge, above-mentioned each optimum condition, but combination in any namely get each preferred embodiments of the utility model.
Positive progressive effect of the present utility model is:
Dissolved oxygen DO pick-up unit of the present utility model and dissolved oxygen DO detector, keep the excited state of described polarogram formula dissolved oxygen electrode by increasing capacitor, so no longer need to repeat to intensify, at any time use at any time and measure, so no longer need the user to wait for that 4-6h makes polarogram formula dissolved oxygen electrode enter excited state, under the prerequisite that guarantees measuring accuracy and power consumption, shortened the Measuring Time of dissolved oxygen DO greatly and measured efficient.
Description of drawings
Fig. 1 is the cross-sectional view of the preferred embodiment of dissolved oxygen DO detector of the present utility model.
Fig. 2 is the structural representation of the dissolved oxygen DO pick-up unit of preferred embodiment of the present utility model.
Embodiment
Mode below by embodiment further specifies the utility model, but therefore the utility model is not limited among the described scope of embodiments.
As shown in Figure 1, comprise a circuit board 1 and a seal casinghousing 2 in the dissolved oxygen DO detector of present embodiment, wherein said circuit board 1 is provided with a dissolved oxygen DO pick-up unit 3.Have a hickey 21 and a hickey 22 on the described seal casinghousing 2.The dissolved oxygen DO pick-up unit 3 of described circuit board 1 and carrying thereof is arranged at the inside of described seal casinghousing 2 jointly.
Wherein as shown in Figure 2, comprise a polarogram formula dissolved oxygen electrode 301, a voltage follower 302, an electrode excitation unit 303, a processor 304, an amplifier 305, an AD converter 306, a RS485 interface 307, a temperature sensor 308, a diode 309, a capacitor 310 and a current-to-voltage convertor 311 in the dissolved oxygen DO pick-up unit 3 of present embodiment.
Wherein said polarogram formula dissolved oxygen electrode 301 is for detection of the simulating signal of dissolved oxygen DO in the sign water body that generates.Described electrode excitation unit 303 intensifies described polarogram formula dissolved oxygen electrode 301 by the voltage signal that generates.
Isolate described electrode excitation unit 303 and described polarogram formula dissolved oxygen electrode 301 by described voltage follower 302 in the present embodiment.Make that the signal between described electrode excitation unit 303 and described polarogram formula dissolved oxygen electrode 301 can the phase mutual interference, thereby guarantee the stability of the pumping signal of described electrode excitation unit 303 outputs.
Specifically, can be 0.1% voltage-reference REF3312(Texas Instruments by precision in the present embodiment) produce the accurate voltage source of 1.25V, the mode that two potentiometer dividing potential drops by 0.1% precision obtain the voltage of 0.685V constitutes described electrode excitation unit 303, be 1 low consumed power operational amplifier TLV2401(Texas Instruments through enlargement factor again) voltage follower that constitutes, and then output voltage encourages described polarogram formula dissolved oxygen electrode 301.Because polarogram formula dissolved oxygen electrode belongs to electrochemical principle, its impedance must not be constant, utilizes the little characteristic of the big output impedance of operational amplifier input impedance, plays buffer action, has guaranteed the stability of excitation output.
Described electrode excitation unit 303 is electrically connected described capacitor 310, and described capacitor 310 inserts a power supply (not shown) by described diode 309.The anode of wherein said diode 309 inserts described power supply, and the negative electrode of described diode 309 is electrically connected with described capacitor 310.
Capacitor described in the present embodiment 310 is jumbo capacitor, for example the capacitor of farad level.Passing through described capacitor 310 in the present embodiment is 303 power supplies of described electrode excitation unit, because the accumulate of capacitor 310, so even power cut-off can also guarantee that described electrode excitation unit 303 normally intensifies described polarogram formula dissolved oxygen electrode 301.
And power supply described in the present embodiment is not directly to add on the described electrode excitation unit 303, but import described diode 309 earlier into, and to described capacitor 310 charging of farad level, and then by 303 power supplies of 310 pairs of described electrode excitations of described capacitor unit, therefore when outage, because the unilateral conduction of described diode 309, described capacitor 310 can only be to 303 power supplies of described electrode excitation unit, thereby guarantee that described polarogram formula dissolved oxygen electrode 301 two ends all are in foment all the time, significantly reduced the actuation duration of electrode when measuring.
The formula of polarogram described in present embodiment dissolved oxygen electrode 301, current-to-voltage convertor 311, amplifier 305, AD converter 306, processor 304 and RS485 interface 307 are electrically connected successively.
Wherein based on the principle of work of above-mentioned described polarogram formula dissolved oxygen electrode 301 as can be known, described polarogram formula dissolved oxygen electrode 301 can characterize out with the mode of the dissolved oxygen DO in the water body with current signal.
After this described current-to-voltage convertor 311 is used for the current signal that described polarogram formula dissolved oxygen electrode 301 generates is converted into analog voltage signal, described amplifier 305 amplifies described analog voltage signal makes its input with follow-up described AD converter 306 require to mate, described AD converter 306 is converted to digital signal with described analog voltage signal then, last described processor 304 transfers to external unit with described digital signal by described RS495 interface 307, for example computing machine etc.
Though carry out data communication by described RS495 interface 307 with outer setting in the present embodiment, those skilled in the art can adopt data transmission interface arbitrarily based on the purpose of data transmission, and are not limited only to the RS485 interface in the present embodiment.
Same described processor 304 can adopt the processor that transmission data and data processing function are just arranged arbitrarily, and temperature sensor described in the present embodiment 308 is connected with described processor 304, described temperature sensor 308 is gathered the temperature of described processor 304 and is transferred to described processor 304, and after this described processor 304 carries out temperature compensation based on described temperature to described digital signal.
Specifically, the current signal of the formula of polarogram described in present embodiment dissolved oxygen electrode 301 output is by by CA3140(Intersil Intersil company) current-to-voltage converting circuit that constitutes converts voltage signal to, at a kind of complete little power consumption instrument amplifier that amplifies AD627(Ya De promise semiconductor company through amplifier) amplify 5 times and enter the little core of MCP3421(company) AD converter of formation and be converted to digital signal.
Described temperature sensor adopts high accuracy number temperature sheet upper sensor DS18B20(dallas, u.s.a company) collecting temperature.Thereby described processor 304 carries out temperature compensation based on the temperature that described DS18B20 gathers to digital signal.
After this digital signal after described processor 304 will compensate is by described RS485 interface 307 outputs.
And its present embodiment is divided into described current-to-voltage convertor 311, amplifier 305, AD converter 306, temperature sensor 308, processor 304 and 307 work of RS485 interface dormancy and works two kinds of patterns in order to realize low power dissipation design.When dormancy, have only processor 304 and RS485 interface 307 to be in power mode, all the other components and parts all are in off-position.When external unit needs the read sensor data, read data command by described RS485 interface 307 transmissions, described processor 304 wakes each components and parts that are in dormant state up based on the described data command that reads, and then transfers mode of operation immediately to.Each component powers on, described processor 304 is waited for data stabilization, the value of reading temperature sensor 308 calculates dissolved oxygen value by temperature compensation algorithm when reading described AD converter 306 conversion values, is sent to external unit by described RS485 interface 307.
In addition as shown in Figure 1, for the ease of detecting water body, present embodiment is arranged at described polarogram formula dissolved oxygen electrode 301 on the described hickey 21, described power supply is connected to described dissolved oxygen DO pick-up unit 3 by a cable 4 in addition, and be described dissolved oxygen DO pick-up unit 3 power supplies, wherein said cable 4 is described dissolved oxygen DO pick-up unit 3 power supplies by described hickey 22 equally.
Specifically, hickey described in the present embodiment 21 is one six and is in charge of interior tooth.Described hickey 22 is a M16 internal thread (a kind of standard-sized screw thread), and described cable 4 is drawn by it.Described cable 4 can adopt water conservancy project cable anticorrosion, abrasionproof.And described hickey 21 and hickey 22 can realize waterproof, and when described hickey 21 and hickey 22 sealings, needs smear at the screw thread place cylinder fluid sealant (not shown).
Structure by above-mentioned seal casinghousing 2 and hickey can also realize the waterproof to the circuit board 1 that described dissolved oxygen DO pick-up unit 3 is set.
Though more than described embodiment of the present utility model, it will be understood by those of skill in the art that these only illustrate, protection domain of the present utility model is limited by appended claims.Those skilled in the art can make numerous variations or modification to these embodiments under the prerequisite that does not deviate from principle of the present utility model and essence, but these changes and modification all fall into protection domain of the present utility model.
Claims (11)
1. dissolved oxygen DO pick-up unit, for detection of the dissolved oxygen DO in the water body, described dissolved oxygen DO pick-up unit comprises a polarogram formula dissolved oxygen electrode and an electrode excitation unit, it is characterized in that, described dissolved oxygen DO pick-up unit also comprises a capacitor, and described electrode excitation unit inserts a power supply by described capacitor.
2. dissolved oxygen DO pick-up unit as claimed in claim 1, it is characterized in that, described dissolved oxygen DO pick-up unit also comprises a processor, one current-to-voltage convertor, one AD converter and a communication interface, wherein said polarogram formula dissolved oxygen electrode, current-to-voltage convertor, AD converter, processor and communication interface are electrically connected successively, described current-to-voltage convertor is used for the current signal of the sign dissolved oxygen DO of described polarogram formula dissolved oxygen electrode generation is converted into analog voltage signal, described AD converter is used for described analog voltage signal is converted to digital signal, and described processor transfers to external unit with described digital signal by described communication interface.
3. dissolved oxygen DO pick-up unit as claimed in claim 2, it is characterized in that, described dissolved oxygen DO pick-up unit also comprises a temperature sensor that is electrically connected with described processor, described temperature sensor is gathered the temperature of described processor, described processor carries out temperature compensation based on the temperature of described temperature sensor collection to described digital signal, and the digital signal after the temperature compensation is transferred to external unit by described communication interface.
4. dissolved oxygen DO pick-up unit as claimed in claim 2 is characterized in that, described communication interface is the RS485 interface.
5. dissolved oxygen DO pick-up unit as claimed in claim 2 is characterized in that, also is serially connected with an amplifier between described AD converter and the described current-to-voltage convertor, and described amplifier is used for amplifying the analog voltage signal of described current-to-voltage convertor output.
6. dissolved oxygen DO pick-up unit as claimed in claim 1 is characterized in that, described dissolved oxygen DO pick-up unit also comprises a voltage follower, and described voltage follower is serially connected with between described polarogram formula dissolved oxygen electrode and the electrode excitation unit.
7. dissolved oxygen DO pick-up unit as claimed in claim 6 is characterized in that, described voltage follower is an operational amplifier, and the enlargement factor of wherein said operational amplifier is 1.
8. dissolved oxygen DO pick-up unit as claimed in claim 1 is characterized in that, described dissolved oxygen DO pick-up unit also comprises a diode, and the anode of described diode inserts described power supply, and the negative electrode of described diode is connected with described capacitor electrode.
9. dissolved oxygen DO detector, it is characterized in that, described dissolved oxygen DO detector comprises a circuit board and has a seal casinghousing of two interfaces, described circuit board is provided with as each described dissolved oxygen DO pick-up unit among the claim 1-8, and described circuit board is fixed in the inside of described seal casinghousing;
The polarogram formula dissolved oxygen electrode of described dissolved oxygen DO pick-up unit is located at an interface of described seal casinghousing, and another interface of described seal casinghousing is used for connecting described power supply.
10. dissolved oxygen DO detector as claimed in claim 9 is characterized in that, described interface is hickey, and described polarogram formula dissolved oxygen electrode is arranged at a hickey, and described power supply is connected to another hickey by a cable.
11. dissolved oxygen DO detector as claimed in claim 10 is characterized in that, is filled with cylinder seal glue in the screw thread of described hickey.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320003830 CN203037617U (en) | 2013-01-05 | 2013-01-05 | Dissolved oxygen detection device and dissolved oxygen detector |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320003830 CN203037617U (en) | 2013-01-05 | 2013-01-05 | Dissolved oxygen detection device and dissolved oxygen detector |
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| CN203037617U true CN203037617U (en) | 2013-07-03 |
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| CN 201320003830 Expired - Fee Related CN203037617U (en) | 2013-01-05 | 2013-01-05 | Dissolved oxygen detection device and dissolved oxygen detector |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105466996A (en) * | 2015-12-30 | 2016-04-06 | 南京信息工程大学 | Oxygen current measuring circuit, dissolved oxygen measuring apparatus and oxygen current measuring method |
-
2013
- 2013-01-05 CN CN 201320003830 patent/CN203037617U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105466996A (en) * | 2015-12-30 | 2016-04-06 | 南京信息工程大学 | Oxygen current measuring circuit, dissolved oxygen measuring apparatus and oxygen current measuring method |
| CN105466996B (en) * | 2015-12-30 | 2019-04-16 | 南京信息工程大学 | A kind of oxygen current measurement circuit, dissolved oxygen sensing instrument and oxygen current measuring method |
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