CN109557130A - A kind of measurement and control method for detection gas thermal conductivity - Google Patents
A kind of measurement and control method for detection gas thermal conductivity Download PDFInfo
- Publication number
- CN109557130A CN109557130A CN201710871404.1A CN201710871404A CN109557130A CN 109557130 A CN109557130 A CN 109557130A CN 201710871404 A CN201710871404 A CN 201710871404A CN 109557130 A CN109557130 A CN 109557130A
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- Prior art keywords
- measurement
- circuit
- control
- conductance cell
- temperature
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
Abstract
The invention belongs to technical field of analytical instruments, and in particular to a kind of measurement and control method for detection gas thermal conductivity.The temperature control of secondary meter in conventional method and measurement function are arranged into conductance cell for it, solve the problems, such as that signal is easy to be interfered, while measuring signal has been carried out standardized transformation.
Description
Technical field
The invention belongs to technical field of analytical instruments, and in particular to a kind of measurement and control for detection gas thermal conductivity
Method.
Background technique
In technical field of analytical instruments, the ingredient that gas is measured by detection gas thermal conductivity is a kind of common side
Method.When tested gas flows through specific device (conductance cell), the balance and the heat of tested gas of measuring bridge therein
Conductance is related;By the variation of measuring bridge equalization point in detection conductance cell, to measure the thermal conductivity of tested gas, to calculate
The ingredient of tested gas.
To ensure the stabilization measured, conductance cell is typically required in temperature constant state.The prior art is in secondary meter
Temperature control and measuring circuit are set, realize the temperature control of conductance cell and the measurement of signal.Due to opposite between secondary meter and conductance cell
Apart from distant (usually having 20 ~ 30 meters), and the signal measured is weaker, is easy to be interfered.
Summary of the invention
The purpose of the invention is to overcome, relative distance is distant between prior art secondary meter and conductance cell and surveys
The signal of amount is weaker, is easy the drawbacks of being interfered and a kind of measurement and controlling party for detection gas thermal conductivity for proposing
Method.It solves the problems, such as that signal is easy to be interfered, while measuring signal has been carried out standardized transformation, is convenient for secondary meter
Measurement.
The method of the present invention is achieved in that the setting circuit of measurement and control plate in conductance cell, will be secondary in conventional method
The temperature control of instrument and measurement function are arranged into circuit board, it realizes temperature control and measurement function using single-chip microcontroller as core.
Under the control of single-chip microcontroller, the output signal of measuring bridge is amplified, is believed by A/D circuit conversion at number
Number, then after single-chip microcontroller progress data processing, by D/A circuit conversion at (4-20) mA current signal.Monolithic machine testing simultaneously
The temperature of conductance cell is compared with the given value of temperature and controls silicon-controlled on and off, realizes closing for conductance cell temperature
Ring control.Such structure avoids interference of the heating line to measured signal, meanwhile, the transmission of measuring signal uses 4-20mA
Current signal substantially increases its anti-interference ability.
Sensor-based system and circuit of measurement and control plate are integrated in conductance cell, sensor-based system includes heating element, temperature element
And measuring bridge.
Conductance cell is standardized component;Conductance cell has both temperature control and measurement function.
Circuit of measurement and control plate includes power module, silicon-controlled, single-chip microcontroller, data communication module, D/A conversion circuit and A/
D conversion circuit.
Input power is exchange 24V, and power supply is also the heating power supply source of conductance cell.
The digital circuit using CPU as core is used in circuit of measurement and control, and bridge output and the sampling of temperature are all used
Digital circuit, reduces adjustable discrete component, substantially increases the stability of circuit.
Detailed description of the invention
Fig. 1 is the measurement control structure schematic diagram of traditional gas thermal conductivity.
Fig. 2 is the measurement control structure schematic diagram of embodiment heat conductivity of gas.
Fig. 3 is examples measure control circuit and conductance cell relation schematic diagram.
In figure: 1-conductance cell;2-circuit of measurement and control plates;3-temperature control circuits;4-secondary meters;5-measuring circuits;
6-heating elements;7-temperature elements;8-measuring bridges;9-power modules;10-is silicon-controlled;11-single-chip microcontrollers;12-numbers
According to communication module;13-D/A conversion circuits;14-A/D conversion circuits;15-sensor-based systems.
Specific embodiment
Present invention will now be described in detail with reference to the examples and drawings.
Comparative example: the measurement control structure schematic diagram of traditional gas thermal conductivity is as shown in Fig. 1, heating element 6, thermometric member
Part 7 and measuring bridge 8 are placed in conductance cell 1, and temperature control circuit 3(is arranged in secondary meter 4 using exchange 60V heating power supply) and
Measuring circuit 5, for realizing the temperature control of conductance cell 1 and the measurement of signal.Due between secondary meter 4 and conductance cell 1 it is opposite away from
From distant (usually having 20 ~ 30 meters), and the signal measured is weaker, is easy to be interfered.
Embodiment: the measurement control structure schematic diagram of the present embodiment heat conductivity of gas is as shown in Fig. 2, in conductance cell 1
One special measurement control circuit board 2 is set, the temperature control of secondary meter in conventional method and measurement function setting are controlled to measurement
In circuit board 2, use exchange 24V as input power, the power supply is as the heating power supply source for conductance cell 1.Meanwhile it will measure
Signal is standardized the transformation of 4-20mA current signal, convenient for the measurement of secondary meter.
Circuit of measurement and control and 1 relation schematic diagram of conductance cell are as shown in Fig. 3.Sensor-based system 15 is integrated in conductance cell 1
With circuit of measurement and control plate 2, sensor-based system 15 is made of heating element 6, temperature element 7 and measuring bridge 8, circuit of measurement and control
Plate 2 is by power module 9, silicon-controlled 10, single-chip microcontroller 11, data communication module 12, D/A conversion circuit 13 and A/D conversion circuit 14
It constitutes.
The circuit of measurement and control is core with single-chip microcontroller 11, realizes the function such as temperature control and measurement by data communication module 12
Energy.
Under the control of single-chip microcontroller 11, the output signal of measuring bridge 8 is amplified, is converted by A/D conversion circuit 14
At digital signal, then after the progress data processing of single-chip microcontroller 11, standardization (4-20) mA electricity is converted by D/A conversion circuit 13
Flow signal.Single-chip microcontroller 11 detects the temperature of conductance cell 1 by temperature element 7 simultaneously, is compared with the given value of temperature, controls
Silicon-controlled 10 on and off, and pass through the closed-loop control of realization 1 temperature of conductance cell of heating element 6.
The not described place of the present embodiment, for the prior art known to the field.
Claims (7)
1. a kind of measurement and control method for detection gas thermal conductivity, it is characterized in that the setting measurement control electricity in conductance cell
Road plate, it realizes temperature control and measurement function using single-chip microcontroller as core;Under the control of single-chip microcontroller, the output signal of measuring bridge
It is amplified, by A/D circuit conversion at digital signal, then through single-chip microcontroller carry out data processing after, by D/A circuit conversion at
The current signal of 4-20mA;It is silicon-controlled to be compared control with the given value of temperature for the temperature of monolithic machine testing conductance cell simultaneously
On and off, realize conductance cell temperature closed-loop control.
2. the method as described in claim 1, it is characterized in that being integrated with sensor-based system and circuit of measurement and control plate in conductance cell.
3. method according to claim 2, it is characterized in that sensor-based system includes heating element, temperature element and measuring bridge.
4. it is method according to claim 1 or 2, it is characterized in that circuit of measurement and control plate includes power module, silicon-controlled, monolithic
Machine, data communication module, D/A conversion circuit and A/D conversion circuit.
5. the method as described in claim 1, it is characterized in that conductance cell is standardized component;Conductance cell has both temperature control and measurement function
Energy.
6. the method as described in claim 1, it is characterized in that input power is exchange 24V, power supply is also that the heating of conductance cell supplies
Power supply.
7. the method as described in claim 1, it is characterized in that the digital circuit using CPU as core is used in circuit of measurement and control,
Digital circuit has been all made of to bridge output and the sampling of temperature, adjustable discrete component has been reduced, improves the stability of circuit.
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111505047A (en) * | 2020-04-24 | 2020-08-07 | 清华大学 | Device for measuring heat conductivity of high-temperature high-pressure multi-element gas mixture |
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CN204649672U (en) * | 2015-03-26 | 2015-09-16 | 福州外语外贸学院 | A kind of high-accuracy survey nitrogen instrument based on thermal conductivity sensor |
CN105223232A (en) * | 2015-10-28 | 2016-01-06 | 中国农业大学 | A kind of thermal conductivity measuring instrument and measuring method |
CN205941448U (en) * | 2016-08-26 | 2017-02-08 | 西安鼎研科技有限责任公司 | VOC gas sensor's concentration and temperature drift's compensating circuit |
CN106770445A (en) * | 2017-01-18 | 2017-05-31 | 中国科学院深圳先进技术研究院 | Thermoelectricity detecting system and thermoelectricity detection method |
CN106841287A (en) * | 2017-03-20 | 2017-06-13 | 湘潭大学 | A kind of High Accuracy Flat method measuring thermal conductivity device based on saturated vapor heating |
CN206399918U (en) * | 2016-11-22 | 2017-08-11 | 株式会社岛津制作所 | The protection structure of thermal conductivity cell detector |
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2017
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Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
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CN200953006Y (en) * | 2006-09-08 | 2007-09-26 | 薛文伟 | Diffusion type heat contact thermal conducting pool |
CN101813658A (en) * | 2010-03-08 | 2010-08-25 | 北京纳克分析仪器有限公司 | Thermal conductivity detector of a pair of thermal resistors |
CN204649672U (en) * | 2015-03-26 | 2015-09-16 | 福州外语外贸学院 | A kind of high-accuracy survey nitrogen instrument based on thermal conductivity sensor |
CN105223232A (en) * | 2015-10-28 | 2016-01-06 | 中国农业大学 | A kind of thermal conductivity measuring instrument and measuring method |
CN205941448U (en) * | 2016-08-26 | 2017-02-08 | 西安鼎研科技有限责任公司 | VOC gas sensor's concentration and temperature drift's compensating circuit |
CN206399918U (en) * | 2016-11-22 | 2017-08-11 | 株式会社岛津制作所 | The protection structure of thermal conductivity cell detector |
CN106770445A (en) * | 2017-01-18 | 2017-05-31 | 中国科学院深圳先进技术研究院 | Thermoelectricity detecting system and thermoelectricity detection method |
CN106841287A (en) * | 2017-03-20 | 2017-06-13 | 湘潭大学 | A kind of High Accuracy Flat method measuring thermal conductivity device based on saturated vapor heating |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN111505047A (en) * | 2020-04-24 | 2020-08-07 | 清华大学 | Device for measuring heat conductivity of high-temperature high-pressure multi-element gas mixture |
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Application publication date: 20190402 |