CN104316567A - Online pH value monitoring system - Google Patents
Online pH value monitoring system Download PDFInfo
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- CN104316567A CN104316567A CN201410536925.8A CN201410536925A CN104316567A CN 104316567 A CN104316567 A CN 104316567A CN 201410536925 A CN201410536925 A CN 201410536925A CN 104316567 A CN104316567 A CN 104316567A
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Abstract
The invention relates to an online pH value monitoring system. The online pH value monitoring system is characterized in that a C8051F340 singlechip is taken as the control core of the system and the periphery of the system is composed of a signal acquisition circuit, a memory circuit, a power supply circuit, an input circuit and an output circuit, wherein all the circuits are directly connected with the C8051F340 singlechip, respectively. The online pH value monitoring system has the functions of temperature compensation, automatic electrode calibration and data out-of-limit alarm. A USB controller embedded in the C8051F340 singlechip is used for realizing data communication with a PC; acquired data are processed by use of a software/hardware filtering method; anti-interference treatment is performed by use of methods such as connecting a high-resistance insulated wire with an electrode, floating the input end, arranging an external shield and isolating power. In practical application, the system is capable of realizing on-line working with the PC, or acquiring data independently. Compared with a traditional pH value monitoring device, the online pH value monitoring system has the advantages of high reliability, powerful anti-interference capability, high sensitivity, low power consumption, convenience for expansion, simple and convenient operations and the like, and is capable of realizing good man-machine interaction and wide in application prospect.
Description
Technical field
The present invention relates to a kind of on-line pH value monitoring system.
Background technology
Solution ph weighs one of the major criterion of process water, domestic water, environmental monitoring.Along with the development of process of industrialization, also day by day serious to the destruction of ecologic environment, the pH value of Real-Time Monitoring industrial processes and ecologic environment and oxidation-reduction potential, and controlled significant.The bus interface that USB interface-based on-line pH value monitoring system USB replaces legacy interface to be connected with PC as data acquisition unit.Solution ph, temperature and oxidation-reduction potential are passed to Pc machine by USB interface by data acquisition unit, monitor curve in real time to show, and realize the storage to data, curve.
Summary of the invention
The present invention aims to provide one can monitor curve in real time, and realizes a kind of on-line pH value monitoring system to data, profile memory function.
Technical program of the present invention lies in:
A kind of on-line pH value monitoring system, native system take C8051F340 as control core, and periphery is made up of signal acquisition circuit, memory circuit, power circuit, input circuit and output circuit; Wherein, it directly connects C8051F340 respectively.
Preferably, described signal acquisition circuit is the electrode, signal conditioning circuit and the A/D change-over circuit that connect successively.
More preferably, described electrode employing glass electrode and platinum ORP electrode realize the collection to solution ph and oxidation-reduction potential.
Or preferably, described input circuit is keyboard.
Or preferably, described output circuit is LCD, reporting to the police exports and PC monitoring output.
More preferably, A/D conversion circuit adopts the analog to digital conversion of biproduct somatotype A/D converter ICL7109 realization to collection signal of 12 precision.
Or preferably, native system is also provided with a temperature sensor.
Or preferably, described temperature sensor model is Sl8820.
Technique effect of the present invention is:
USB interface-based pH value on-line monitoring system, has temperature compensation, electrode automatic Calibration, data over run warning function.The data communication with PC is achieved with the USB controller that C8051F340 single-chip microcomputer is embedded, by the method for software and hardware filtering, image data is processed, and adopt the methods such as high resistant insulated wire connecting electrode, input end floating, peripheral hardware radome, isolated from power to carry out anti-interference process.In practical application, system can again can independent acquisition data with PC on-line working.Have that reliability is high, antijamming capability is strong with traditional pH value monitoring equipment comparison system, highly sensitive, low-power consumption, be convenient to advantages such as expanding, easy and simple to handle, good man-machine interaction can be realized, have a extensive future.
Description of drawings 1 is present system block diagram.
Embodiment
A kind of on-line pH value monitoring system, native system take C8051F340 as control core, and periphery is made up of signal acquisition circuit, memory circuit, power circuit, input circuit and output circuit; Wherein, it directly connects C8051F340 respectively.Signal acquisition circuit is the electrode, signal conditioning circuit and the A/D change-over circuit that connect successively.Electrode employing glass electrode and platinum ORP electrode realize the collection to solution ph and oxidation-reduction potential.Described input circuit is keyboard.Output circuit is LCD, reporting to the police exports and PC monitoring output.
A/D conversion circuit adopts the analog to digital conversion of biproduct somatotype A/D converter ICL7109 realization to collection signal of 12 precision.Native system is also provided with a temperature sensor.Described temperature sensor model is Sl8820.
The output signal of technical grade compound glass electrode is-500 ~+500 mV, electrode internal resistance is 108 Europe, Europe-109, platinum ORP electrode output signal is the key one of-2 000 ~+2000 mV. signal processing circuits is to realize the impedance matching to glass electrode, and two is to realize the amplification to two kinds of electrode output signal different proportions.Metering circuit has selected CA3140 to form two high impedance amplifier, and prime adopts in-phase amplifier, can obtain 10
12the input impedance in Europe, rear class adopts differential amplifier circuit, can obtain higher common-mode rejection ratio, strengthens antijamming capability.Arranging circuit enlargement factor for glass electrode is 5 times, and arranging circuit enlargement factor for ORP electrode is 2 times.In order to eliminate the impact of printed board insulation resistance on amplifying circuit input impedance, in design
Have employed floating method to process, contact conductor directly connects chip pin.Because front stage circuits input impedance is higher, be easily subject to the interference of extraneous signal, although differential amplifier circuit has stronger common mode inhibition effect, have part Hz noise can enter circuit with difference mode signal, cause the fluctuation of measurement result.The filtering of double T bandpass filter realization to 50 Hz Hz noise of band feedback is have employed in design.In addition, in order to suppress the harmonic influence of 50Hz, design turn increases one-level active low-pass filter circuit, and centre frequency gets 150 Hz.
The magnitude of voltage gathered in the amplifying circuit of prime is all ambipolar, adopts the analog to digital conversion of biproduct somatotype A/D converter ICL7109 realization to measured signal in design.ICL7109 has 12 conversion accuracies, and typical power consumption is less than 20 mW, is the modulus conversion chip of a high precision, low noise, low drifting, high input impedance.41, can effectively suppress power frequency in disturbing.In design, ICL7109 adopts direct mode and C8051F340
Connect, be connected with the Po.3 mouth of C8051n40 by STATUS pin.Configuring P0.3 is in software external interrupt input end 13, and when ICL7109 EOC, send EOC instruction by STATUS and interrupt to single-chip microcomputer application, in interrupt service routine, single-chip microcomputer divides high low byte to read to translation data.ICL7109 reference voltage gets 2.048 V, and full scale output can reach 4.096 V. to be had to make ICL7109
Anti-50 Hz interference performances preferably, crystal frequency selects 6 MHz, and completing a switching time is 79.2 ms, and namely switching rate is 12.6 times/s.
The change of temperature directly affects the accuracy that pH value is measured, and pH meter temperature measuring circuit in the past generally adopts platinum resistance as temperature sensor, but due to platinum resistance itself be that the non-linear linear correction method that makes exists error, affect correction accuracy.Design adopts One Wire digital temperature sensor DSl8820 to gather solution temperature, and it has, and volume is little, measuring accuracy is high, without the need to advantages such as A/D conversions.There is ± the precision of 0.5 oc within the scope of-10 ~+85 DEG C, 0.01 DEG C can be reached through special processing precision, can system requirements be met.Temperature sensor sends data to single-chip microcomputer by Po.2 mouth, and single-chip microcomputer draws temperature value after algorithm process, completes and calculates the temperature compensation of pH value.
Be integrated with USB2.0 controller at full speed in C8051F340 inside, have 8 USB end points, 1 KB FIFO memory and clock recovery circuitry, therefore adopt the USB Controller gain variations telecommunication circuit of C805lF340 comparatively easy.The maximum current of usb bus is 500 mA, considers the demand for security of system power supply, and USB connects 13 employing self-powered modes, and 5 V power supplys export 3.3 V power supplys to system power supply through integrated regulator.In order to prevent ESD from disturbing, be connected to esd protection diode at D+, D-pin.
The present invention has temperature compensation, electrode automatic Calibration, data over run warning function.The data communication with PC is achieved with the USB controller that C8051F340 single-chip microcomputer is embedded, by the method for software and hardware filtering, image data is processed, and adopt the methods such as high resistant insulated wire connecting electrode, input end floating, peripheral hardware radome, isolated from power to carry out anti-interference process.In practical application, system can again can independent acquisition data with PC on-line working.Have that reliability is high, antijamming capability is strong with traditional pH value monitoring equipment comparison system, highly sensitive, low-power consumption, be convenient to advantages such as expanding, easy and simple to handle, good man-machine interaction can be realized, have a extensive future.
Claims (8)
1. an on-line pH value monitoring system, is characterized in that: native system take C8051F340 as control core, and periphery is made up of signal acquisition circuit, memory circuit, power circuit, input circuit and output circuit; Wherein, it directly connects C8051F340 respectively.
2. as claim 1 on-line pH value monitoring system, it is characterized in that: described signal acquisition circuit is the electrode, signal conditioning circuit and the A/D change-over circuit that connect successively.
3. as claim 2 on-line pH value monitoring system, it is characterized in that: described electrode employing glass electrode and platinum ORP electrode realize the collection to solution ph and oxidation-reduction potential.
4. as claim 1 on-line pH value monitoring system, it is characterized in that: described input circuit is keyboard.
5. as claim 1 on-line pH value monitoring system, it is characterized in that: described output circuit is LCD, reporting to the police exports and PC monitoring output.
6. as claim 1 on-line pH value monitoring system, it is characterized in that: A/D conversion circuit adopts the analog to digital conversion of biproduct somatotype A/D converter ICL7109 realization to collection signal of 12 precision.
7., as claim 1 on-line pH value monitoring system, it is characterized in that: native system is also provided with a temperature sensor.
8. as claim 4 on-line pH value monitoring system, it is characterized in that: described temperature sensor model is Sl8820.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410536925.8A CN104316567A (en) | 2014-10-13 | 2014-10-13 | Online pH value monitoring system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410536925.8A CN104316567A (en) | 2014-10-13 | 2014-10-13 | Online pH value monitoring system |
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| CN104316567A true CN104316567A (en) | 2015-01-28 |
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| CN201410536925.8A Pending CN104316567A (en) | 2014-10-13 | 2014-10-13 | Online pH value monitoring system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104990970A (en) * | 2015-06-24 | 2015-10-21 | 中山欧麦克仪器设备有限公司 | Dissolved oxygen sensor with automatic temperature compensating |
| CN105891262A (en) * | 2016-05-08 | 2016-08-24 | 柴永朋 | PH tester capable of continuously measuring PH value |
| CN107684412A (en) * | 2017-09-30 | 2018-02-13 | 常州凯南迪克医疗科技有限公司 | One kind miniaturization upper digestive tract dynamic ph Impedance monitoring device |
| CN113447630A (en) * | 2021-06-29 | 2021-09-28 | 安徽思环科技有限公司 | Multi-parameter trace ion integrated online monitoring system |
-
2014
- 2014-10-13 CN CN201410536925.8A patent/CN104316567A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104990970A (en) * | 2015-06-24 | 2015-10-21 | 中山欧麦克仪器设备有限公司 | Dissolved oxygen sensor with automatic temperature compensating |
| CN105891262A (en) * | 2016-05-08 | 2016-08-24 | 柴永朋 | PH tester capable of continuously measuring PH value |
| CN105891262B (en) * | 2016-05-08 | 2018-09-04 | 中山市厚源电子科技有限公司 | It is a kind of can METHOD FOR CONTINUOUS DETERMINATION pH value PH analyzers |
| CN107684412A (en) * | 2017-09-30 | 2018-02-13 | 常州凯南迪克医疗科技有限公司 | One kind miniaturization upper digestive tract dynamic ph Impedance monitoring device |
| CN107684412B (en) * | 2017-09-30 | 2023-10-31 | 常州凯南迪克医疗科技有限公司 | Miniaturized upper gastrointestinal dynamic pH impedance monitoring device |
| CN113447630A (en) * | 2021-06-29 | 2021-09-28 | 安徽思环科技有限公司 | Multi-parameter trace ion integrated online monitoring system |
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