CN114167137A - Device capable of automatically calibrating conductivity cell constant and continuously detecting conductivity of oil material - Google Patents
Device capable of automatically calibrating conductivity cell constant and continuously detecting conductivity of oil material Download PDFInfo
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- CN114167137A CN114167137A CN202111403009.3A CN202111403009A CN114167137A CN 114167137 A CN114167137 A CN 114167137A CN 202111403009 A CN202111403009 A CN 202111403009A CN 114167137 A CN114167137 A CN 114167137A
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- 238000001514 detection method Methods 0.000 abstract description 5
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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Abstract
The invention relates to the technical field of oil conductivity detection, in particular to a device capable of automatically calibrating a conductivity cell constant and continuously detecting oil conductivity, which comprises a bipolar power supply, wherein the bipolar power supply outputs DC voltage signals with the same amplitude and opposite phases and is connected to a double-path input end of an analog switch, the analog switch is connected with a single chip microcomputer MCU (microprogrammed control Unit) for timer delay, the DC voltage signals enter an operational amplifier for proportional operation through a conductivity cell X after being delayed, and are displayed on an LCD after being subjected to operational amplification and partial pressure with a precision high-resistance box. The oil material measuring device can automatically calibrate the electrode constant and continuously measure the oil material, and the used single chip microcomputer is low in power consumption, few in components, portable and convenient, and has a good development prospect in oil material detection.
Description
Technical Field
The invention relates to the technical field of oil conductivity detection, in particular to a device capable of automatically calibrating a conductivity cell constant and continuously detecting oil conductivity.
Background
The conductivity of oil is an indicator of the insulating degree of oil, and the charge accumulation forms the main parameter of static electricity. In order to ensure the safety of the oil product during storage, transportation and use, an appropriate proportion of antistatic agent is added into the oil product to control the oil product to reach the standard conductivity.
The oil conductivity tester can be used for precisely measuring the conductivity of various oils (such as transformer oil, aviation fuel, gasoline, kerosene, diesel oil, engine oil, edible oil, lubricating oil, paint and coating and the like) with high cleanliness or serious pollution in oil laboratories of various industries. The electrostatic safety, electrical insulation, additive content comparison, cleanliness or pollution degree of the oil can be known by measuring the electrical conductivity.
Because a direct current voltage is usually added during oil material measurement, the instantaneous current between the electrodes is immediately measured, and the static conductivity of the measured sample is obtained. The continuous measurement may be performed by repeating the measurement with the same amplitude and the same duty ratio using the bipolar voltage to reduce the influence of the electric double layer capacitance in order to prevent polarization.
Disclosure of Invention
Aiming at the defects of the prior art, the invention discloses a device capable of automatically calibrating a conductivity cell constant and continuously detecting the conductivity of an oil material, which is used for automatically calibrating after the conductivity cell constant of different electrodes is input according to different conductivity cell constants so as to reduce the measurement error.
The invention is realized by the following technical scheme:
the invention provides a device capable of automatically calibrating a conductivity cell constant and continuously detecting the conductivity of oil, which comprises a bipolar power supply, wherein the bipolar power supply outputs DC voltage signals with the same amplitude and reverse phase, and is connected to a double-path input end of an analog switch, the analog switch is connected with a single chip microcomputer MCU (microprogrammed control Unit) to perform timer delay, the DC voltage signals enter an operational amplifier for proportional operation after being delayed through a conductivity cell X, and are displayed on an LCD (liquid crystal display) after being subjected to operational amplification and partial pressure with a precision high-resistance box.
Furthermore, the bipolar power supply outputs positive and negative direct current signals, and the positive and negative direct current signals enter the analog switch after the current is limited by the resistors R1 and R2.
Furthermore, after the precision high-resistance box carries out operational amplifier voltage division, the output voltage signal is transmitted to the single chip microcomputer MCU to carry out data processing of analog quantity to digital quantity conversion and is displayed on the LCD.
Furthermore, the MCU utilizes a timer to delay and control the high and low level switching of the P1.6 pin, the timing period is one switching for n seconds, and n is a positive integer.
Furthermore, the MCU is MSP430F2419 MCU.
Furthermore, the analog switch uses a CD4053 chip, and a control pin of the analog switch receives signals with different levels and selects a corresponding input terminal to output.
Furthermore, a control pin of the analog switch is a tenth pin B, when the B receives a high level, the BY pin is conducted to be connected to the BOUT, the voltage is output, and after the detected oil material substance passes, the signal is transmitted to the operational amplifier.
Furthermore, a control pin of the analog switch is a tenth pin B port, when the B port receives a low level, the BX port is conducted to the BOUT, the output voltage passes through the operational amplifier, the voltage follower consisting of the analog switch and the operational amplifier, enters a P6 port of the singlechip for ADC data conversion, and is finally displayed on the liquid crystal screen.
Furthermore, the operational amplifier is CA3140, the operational amplifier, the precise high-resistance box and the tested oil material form an inverse proportion circuit, the singlechip controls a pin P1.5 to output a low-level signal, and the analog switch conducts the pin AOUT/AIN and the pin AX.
Furthermore, when the device is used, a user transmits the electrode constants on the labels of the electrodes to the single chip microcomputer in a keyboard input mode, and the single chip microcomputer automatically processes data input by the keyboard, corrects the electrode constants of different electrodes and enables the electrode constants of the electrodes to be compensated to be 0.01.
The invention has the beneficial effects that:
the oil material measuring device can automatically calibrate the electrode constant and continuously measure the oil material, and the used single chip microcomputer is low in power consumption, few in components, portable and convenient, and has a good development prospect in oil material detection.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a bipolar voltage measurement circuit according to an embodiment of the present invention;
fig. 2 is a schematic block diagram of automatic calibration of conductivity cell constants according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The embodiment provides a device capable of automatically calibrating a conductivity cell constant and continuously detecting the conductivity of oil, which comprises a bipolar power supply, wherein the bipolar power supply outputs a direct-current voltage signal with the same amplitude and the opposite phase, and is connected to a double-path input end of an analog switch, the analog switch is connected with a single chip microcomputer MCU (microprogrammed control unit) to perform timer delay, the direct-current voltage signal enters an operational amplifier for proportional operation after being delayed, and the direct-current voltage signal is displayed on an LCD (liquid crystal display) after being subjected to operational amplifier voltage division with a precision high-resistance box.
In the embodiment, because different electrodes are different in machining accuracy and coaxiality, the electrode constants of the conductive electrodes are not completely consistent, and aiming at the problem, in order to prevent different measurement data caused by different electrode constants of different electrodes, the embodiment utilizes the MCU and the keyboard for input, and the calibration of the electrode constants can be carried out before measurement.
In the embodiment, calibration processing is automatically performed after conductivity cell constants of different electrodes are input according to different conductivity cell constants, so that measurement errors are reduced.
Example 2
Referring to fig. 1, the present embodiment provides a bipolar voltage measuring circuit, which utilizes a bipolar power voltage, an analog switch, a precise high-resistance box, an ultra-high impedance operational amplifier, an operational amplifier feedback circuit, and a single chip to form an ac measuring circuit.
In the embodiment, a pair of direct current voltage signals with the same amplitude and opposite phases are provided by the bipolar power supply voltage, are connected to the two-way input end of the analog switch U1, and are delayed by the timer through the MCU to control the channel gating of the analog switch.
In the embodiment, because the timer of the single chip microcomputer is used for delaying, the duty ratios of two paths of direct current voltages can be ensured to be 50%, then the direct current voltages pass through the conductance cell X, enter the high-impedance operational amplifier for proportional operation, are subjected to operational amplifier voltage division with the precise high-resistance box, and output voltage signals are transmitted to the single chip microcomputer MCU for data processing of analog quantity-to-digital quantity conversion and are displayed on the LCD.
The bipolar power supply A1 of the embodiment outputs a positive/negative 3.3V DC signal, and the current is limited to enter the analog switch U1 through R1 and R2 with the resistance value of 100K, so as to prevent the analog switch from being damaged by large current impact.
The single chip microcomputer MCU controls high and low level switching of a P1.6 pin by using time delay of the timer, the timing period is 3s for one-time switching, and a control pin of the analog switch U1 can select a corresponding input end to output when receiving signals of different levels.
The analog switch selected in the embodiment is a CD4053 chip, the model of the single chip microcomputer MCU is MSP430F2419, the single chip microcomputer is extremely low in power consumption, pA-level current can be achieved, and explosion caused by overhigh current in oil material measurement is prevented.
The control pin of the analog switch of this embodiment is the tenth pin B, and when the B pin receives a high level, the BY pin is turned on to be connected to the BOUT, that is, a +3.3V voltage is output, and after passing through the oil material substance to be detected, the signal is then transmitted to the operational amplifier U2 with a very high input impedance.
The operational amplifier selected in this embodiment is CA3140, operational amplifier U2 and accurate high resistance box, the measured oil material constitutes a reverse proportion circuit, at this moment the monolithic processor controls P1.5 pin, then output a low level signal, analog switch CD4053 will conduct AOUT/AIN pin and AX, because the monolithic processor can't discern the negative voltage signal, so utilize analog switch and fortune to put LM324, make up an inverter again, change the negative voltage signal back to the positive voltage, transmit to the P6 mouth of the monolithic processor, the P6 mouth is the ADC component of MSP430F 2419.
In this embodiment, when the B port receives a low level, the BX port is turned on to BOUT, a voltage of-3.3V is output, and the voltage enters the P6 port of the single chip microcomputer through the CA3140 and the voltage follower formed by the analog switch and the operational amplifier to perform ADC data conversion, and is finally displayed on the liquid crystal screen.
Example 3
In other aspects, referring to fig. 2, a user transmits the electrode constants of the labels of the electrodes to the single chip microcomputer in a keyboard input mode, the single chip microcomputer automatically processes the data input by the keyboard, corrects the electrode constants of different electrodes to enable the electrode constants of the electrodes to be compensated to 0.01, and measurement errors of the electrodes caused by different processing accuracy are eliminated.
In conclusion, the device can automatically calibrate the electrode constant, can continuously measure the oil material, has low power consumption of the used singlechip and few components, can be portable and convenient, and has good development prospect in oil material detection.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The device capable of automatically calibrating the conductivity cell constant and continuously detecting the conductivity of the oil is characterized by comprising a bipolar power supply, wherein the bipolar power supply outputs DC voltage signals with the same amplitude and the opposite phase and is connected to a double-path input end of an analog switch, the analog switch is connected with a single chip microcomputer MCU (microprogrammed control Unit) to perform timer delay, the DC voltage signals enter an operational amplifier for proportional operation through a conductivity cell X after being delayed, and are displayed on an LCD (liquid Crystal display) after being subjected to operational amplification and partial pressure with a precision high-resistance box.
2. The device capable of automatically calibrating the conductivity cell constant and continuously detecting the oil conductivity as claimed in claim 1, wherein the bipolar power supply outputs positive and negative direct current signals, and the signals enter the analog switch after the current is limited by resistors R1 and R2.
3. The device capable of automatically calibrating the conductivity cell constant and continuously detecting the oil conductivity as claimed in claim 1, wherein after the precise high-resistance box performs operational amplifier voltage division, the output voltage signal is transmitted to a single chip microcomputer MCU for analog-to-digital data processing and display on an LCD.
4. The device capable of automatically calibrating the conductivity cell constant and continuously detecting the oil conductivity as claimed in claim 1, wherein the single chip microcomputer MCU utilizes a timer to delay and control the high and low level switching of a P1.6 pin, the timing period is one switching of n seconds, and n is a positive integer.
5. The device capable of automatically calibrating the conductivity cell constant and continuously detecting the oil conductivity as claimed in claim 4, wherein the MCU is MSP430F2419 MCU.
6. The apparatus of claim 1, wherein the analog switch uses a CD4053 chip, and its control pin receives signals of different levels and selects the corresponding input terminal to output.
7. The device capable of automatically calibrating the conductance cell constant and continuously detecting the oil conductivity as claimed in claim 6, wherein the control pin of the analog switch is a tenth pin B, when the B receives a high level, the BY pin is conducted to be connected to BOUT, the output voltage passes through the detected oil material, and then the signal is transmitted to the operational amplifier.
8. The device capable of automatically calibrating the conductance cell constant and continuously detecting the oil conductivity as claimed in claim 7, wherein the control pin of the analog switch is a tenth pin B port, when the B port receives a low level, the BX port is conducted to the BOUT, the output voltage is output, the output voltage passes through the operational amplifier, the voltage follower consisting of the analog switch and the operational amplifier, and enters a P6 port of the single chip microcomputer to perform ADC data conversion, and finally the ADC data is displayed on the liquid crystal screen.
9. The device for automatically calibrating the conductivity cell constant and continuously detecting the oil conductivity as claimed in claim 1, wherein the operational amplifier is CA3140, the operational amplifier, the precise high resistance box and the oil material to be detected form an inverse proportion circuit, the single chip microcomputer controls a pin P1.5 to output a low level signal, and the analog switch conducts the pin AOUT/AIN with AX.
10. The device capable of automatically calibrating the conductivity cell constant and continuously detecting the oil conductivity as claimed in claim 1, wherein when the device is used, a user transmits the electrode constant labeled on the electrode to the single chip microcomputer in a keyboard input mode, and the single chip microcomputer automatically processes the data input by the keyboard to correct the electrode constants of different electrodes so as to compensate the electrode constants of the electrodes to 0.01.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111403009.3A CN114167137A (en) | 2021-11-24 | 2021-11-24 | Device capable of automatically calibrating conductivity cell constant and continuously detecting conductivity of oil material |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111403009.3A CN114167137A (en) | 2021-11-24 | 2021-11-24 | Device capable of automatically calibrating conductivity cell constant and continuously detecting conductivity of oil material |
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| CN114167137A true CN114167137A (en) | 2022-03-11 |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2669202Y (en) * | 2003-12-31 | 2005-01-05 | 北京联合大学生物化学工程学院 | Conductivity pulse measuring device |
| CN2706763Y (en) * | 2004-06-17 | 2005-06-29 | 浙江大学 | Sanitary high-resolution high-speed conducting signal measurer for producing Chinese medicine |
| US20100125937A1 (en) * | 2008-11-24 | 2010-05-27 | Zhongmin Chen | Conductivity sensor and urinal with conductivity sensor |
| CN102353844A (en) * | 2011-06-24 | 2012-02-15 | 华南理工大学 | Two-way electrical conductivity detecting and monitoring device with symmetrical lead self-compensation and detecting and monitoring method using same |
| CN102854388A (en) * | 2012-09-10 | 2013-01-02 | 博格隆(上海)生物技术有限公司 | System for detecting electrical conductivity and pH (potential Of Hydrogen) during biological separation and purification process |
| CN204945080U (en) * | 2015-09-02 | 2016-01-06 | 浙江水利水电学院 | A kind of high precision conductivity measurement system |
| CN205861774U (en) * | 2016-08-12 | 2017-01-04 | 黄山学院 | A kind of oil plant electrical conductivity simulation detection system |
| CN106841324A (en) * | 2017-03-14 | 2017-06-13 | 成都秉德科技有限公司 | A kind of SCM Based TDS water quality testing meters |
-
2021
- 2021-11-24 CN CN202111403009.3A patent/CN114167137A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2669202Y (en) * | 2003-12-31 | 2005-01-05 | 北京联合大学生物化学工程学院 | Conductivity pulse measuring device |
| CN2706763Y (en) * | 2004-06-17 | 2005-06-29 | 浙江大学 | Sanitary high-resolution high-speed conducting signal measurer for producing Chinese medicine |
| US20100125937A1 (en) * | 2008-11-24 | 2010-05-27 | Zhongmin Chen | Conductivity sensor and urinal with conductivity sensor |
| CN102353844A (en) * | 2011-06-24 | 2012-02-15 | 华南理工大学 | Two-way electrical conductivity detecting and monitoring device with symmetrical lead self-compensation and detecting and monitoring method using same |
| CN102854388A (en) * | 2012-09-10 | 2013-01-02 | 博格隆(上海)生物技术有限公司 | System for detecting electrical conductivity and pH (potential Of Hydrogen) during biological separation and purification process |
| CN204945080U (en) * | 2015-09-02 | 2016-01-06 | 浙江水利水电学院 | A kind of high precision conductivity measurement system |
| CN205861774U (en) * | 2016-08-12 | 2017-01-04 | 黄山学院 | A kind of oil plant electrical conductivity simulation detection system |
| CN106841324A (en) * | 2017-03-14 | 2017-06-13 | 成都秉德科技有限公司 | A kind of SCM Based TDS water quality testing meters |
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