CN202494483U - Thermal mass flowmeter - Google Patents
Thermal mass flowmeter Download PDFInfo
- Publication number
- CN202494483U CN202494483U CN2012200242914U CN201220024291U CN202494483U CN 202494483 U CN202494483 U CN 202494483U CN 2012200242914 U CN2012200242914 U CN 2012200242914U CN 201220024291 U CN201220024291 U CN 201220024291U CN 202494483 U CN202494483 U CN 202494483U
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- transmitter
- humidity
- thermal mass
- sensor
- converter
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Abstract
The utility model relates to a thermal mass flowmeter which comprises a sensor and a meter head. The meter head comprises a converter and a light-emitting diode (LED) display. The thermal mass flowmeter is characterized in that the sensor consists of a temperature transmitter, a humidity transmitter and a pressure transmitter. The temperature transmitter and the humidity transmitter are arranged in parallel on the side of a pressure leading hole of the sensor, and the pressure transmitter is disposed between the converter of the meter head and the pressure leading hole of the sensor. The meter head further comprises a communication interface. An MSP430 chip developed by America Texas Instruments is adopted for the converter, and a PROFIBUS-DP interface produced by Beijing D&S Fieldbus Technology Co., Ltd is used as the communication interface. Changes of temperature, humidity and pressure are monitored in real time through the temperature transmitter, the humidity transmitter and the pressure transmitter, compensated in good time, and displayed in the LED display selectively. The thermal mass flowmeter is not only low in cost and low in power consumption of hardware, but also high in metering accuracy.
Description
Technical field
The utility model relates to a kind of mass-flow gas meter, particularly discloses a kind of thermal mass flow meter, is mainly used in the measurement of gas medium.
Background technology
Thermal mass flow meter is owing to have broad quantum, and low flow velocity is responsive, and characteristics such as direct mass flow measurement have obtained in the gasmetry field using widely.In development in science and technology today rapidly, also increase gradually for the requirement of flow instrument.Need carry out the real fixed situation of failing to be sold at auction to thermal mass flow meter to the part industry; A kind of thermal mass flow meter has added pressure unit; Can be in gauge outfit temperature, pressure and the humidity of display medium; So just, can know the operating mode density of medium, and can carry out in good time temperature pressure compensation by actual conditions.
Traditional thermal mass flow meter is in practical application, and many media all can not guarantee absolute drying, and sensor's response can receive the influence of ambient temperature and humidity, causes the precision of sensor to be difficult to further improve.
Summary of the invention
The purpose of the utility model is that the shortcoming of prior art thermal flowmeter is improved; Improve the measuring accuracy of flowmeter; A kind of thermal mass flow meter is disclosed; Added humidity transmitter at Sensor section, made a kind of thermal mass flow meter when measurement has the gas than low humidity, also can guarantee high precision.
The utility model is achieved in that a kind of thermal mass flow meter; Comprise sensor and gauge outfit, the composition of described gauge outfit comprises converter and light-emitting diode display, it is characterized in that: described sensor is made up of temperature transmitter, humidity transmitter and pressure unit; Described temperature transmitter, humidity transmitter are arranged on the center of pipeline; Be arranged in parallel, pressure unit is arranged between the converter and sensor of gauge outfit, and described gauge outfit also comprises communication interface; Described converter adopts the MSP430 chip of Texas Instruments's research and development, the PROFIBUS-DP interface that described communication interface adopts Beijing D&S FieldBus Technology Co., Ltd. to produce.The real-time monitor temperature of described temperature transmitter, humidity transmitter and pressure unit, humidity and pressure change, and compensate in good time and selectively on light-emitting diode display, show.
The beneficial effect of the utility model is: the utility model has added pressure unit at sensor and gauge outfit center section; Sensor has also increased temperature transmitter and humidity transmitter; Can carry out the timely compensation of temperature, pressure and humidity simultaneously to medium; Not only Media density can be understood in real time, also accurate measurement can be stablized.The utility model partly adopts the MSP430 chip at converter; Realize high-performance more, the more technology upgrading of low-power consumption and bigger design flexibility; Its high throughput can become wideer with a kind of range ratio scope of thermal mass flow meter, to be applicable to the measure monitor of all kinds of gases.When industrial gasses are measured, wide for range ratio, and just the sensitivity of flow velocity has quite high requirement, this chip has promoted the performance and the characteristics of thermal mass flow meter all sidedly as the leading-edge products in single-chip microcomputer field.The utility model adopts the PROFIBUS-DP interface on communication interface; The high-speed data transfer characteristics that it possessed not only can read the input information of slave station periodically and send output information to slave station periodically; But also provide the required aperiodicity communication of a kind of thermal mass flow meter to carry out configuration, the diagnosis and the processing of reporting to the police.More abominable at a few thing environment, and need under the situation of teletransmission communication, the performance of its low-cost high-efficiency also will be represented all sidedly.
Description of drawings
Fig. 1 is the utility model thermal mass flow meter one-piece construction block diagram.
Fig. 2 is the PROFIBUS-DP interface circuit of the utility model.
Fig. 3 is the PROFIBUS-DP communication interface main program flow chart of the utility model.
Fig. 4 is the utility model thermal mass flow meter shape assumption diagram.
Among the figure: 1, temperature transmitter; 2, humidity transmitter; 3, pressure unit; 4, communication interface; 5, gauge outfit; 6, converter; 7, LCD display.
Embodiment
According to accompanying drawing 1 and 4, a kind of thermal mass flow meter of the utility model comprises sensor and gauge outfit.The composition of gauge outfit 5 comprises converter 6 and light-emitting diode display 7, communication interface 4.Sensor is made up of temperature transmitter 1, humidity transmitter 2 and pressure unit 3, and temperature transmitter 1, humidity transmitter 2 are arranged on the center of pipeline, is arranged in parallel, and pressure unit 3 is arranged between the converter 6 and sensor of gauge outfit 5.Converter 6 adopts the MSP430 chip of Texas Instruments's research and development, the PROFIBUS-DP interface that communication interface 4 adopts Beijing D&S FieldBus Technology Co., Ltd. to produce.Temperature transmitter 1, humidity transmitter 2 and pressure unit 3 real-time monitor temperatures, humidity and pressure change, and compensate and measurement data can be transferred to converter and selectively on light-emitting diode display, shows in good time.
The utility model is a kind of more special thermal mass flow meter, and it carries out timely compensation through the temperature, pressure humidity transmitter, and the technical feature of the last MSP430 chip of cooperation is that the whole accuracy of measurement of flowmeter is brought raising.MSP430 is a kind of core component of thermal mass flow meter, realizes that the acquisition process of signal, LCD show, storage reaches with 8 single-chip microcomputer PIC18F4520 and carries out exchanges data.
PIC18F4520 and PROFIBUS fieldbus specialized protocol chip SPC3 are the core components of PROFIBUS-DP interface section.PIC18F4520 be responsible for the MSP430F149 swap data and with the realization of functions such as SPC3 communicates by letter, SPC3 is responsible for unpacking the data that main website sends here, is sent to PIC18F4520, the while is uploaded to main website to the packing data that PIC18F4520 sends here.
Use PIC18F4520 as processor unit supervisory communications affairs in the exploitation of PROFIBUS-DP communication interface, the MSP430 protocol chip is then accomplished the conversion and the transmission-receiving function of data, and the annexation between PIC18F4520 and the SPC3 is shown in accompanying drawing 2.
According to accompanying drawing 3; The main task of PIC18F4520 is exactly that the back that powers on is earlier carried out initialization according to the initialization data of MSP430 to SPC3; The interruption that initialization success back produces according to SPC3; The output data unloading that SPC3 is received, main website sends, tissue will be issued the data of main website through SPC3, and organizes external diagnosis etc. as requested.
The utility model adds pressure unit at Sensor section on the basis of the structural design of existing thermal mass flow meter and application thereof, also add a compact moisture transmitter, understands the variation of temperature, pressure and humidity in real time, and in time compensates.Partly adopt the MSP430 chip so that flowmeter reaches wideer range ratio at converter, and on communication interface, use the PROFIBUS-DP interface to make communication connect more high speed, cost cheapness, also make hardware system that lower power consumption is arranged.The one-piece construction of the utility model makes the precision of thermal mass flow meter higher.
Claims (2)
1. thermal mass flow meter; Comprise sensor and gauge outfit, the composition of described gauge outfit comprises converter and light-emitting diode display, it is characterized in that: described sensor is made up of temperature transmitter, humidity transmitter and pressure unit; Described temperature transmitter, humidity transmitter are arranged on the center of pipeline; Be arranged in parallel, pressure unit is arranged between the converter and sensor of gauge outfit, and described gauge outfit also comprises communication interface; Described converter adopts the MSP430 chip of Texas Instruments's research and development, the PROFIBUS-DP interface that described communication interface adopts Beijing D&S FieldBus Technology Co., Ltd. to produce.
2. according to the described a kind of thermal mass flow meter of claim 1; It is characterized in that: the real-time monitor temperature of described temperature transmitter, humidity transmitter and pressure unit, humidity and pressure change, and compensate in good time and selectively on light-emitting diode display, show.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200242914U CN202494483U (en) | 2012-01-19 | 2012-01-19 | Thermal mass flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200242914U CN202494483U (en) | 2012-01-19 | 2012-01-19 | Thermal mass flowmeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202494483U true CN202494483U (en) | 2012-10-17 |
Family
ID=47000708
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200242914U Expired - Fee Related CN202494483U (en) | 2012-01-19 | 2012-01-19 | Thermal mass flowmeter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202494483U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102538887A (en) * | 2012-01-19 | 2012-07-04 | 上海华强浮罗仪表有限公司 | Thermal mass flowmeter |
| CN111148972A (en) * | 2017-09-29 | 2020-05-12 | 日立汽车***株式会社 | Physical quantity detecting device |
| CN112234482A (en) * | 2020-10-29 | 2021-01-15 | 河南水利与环境职业学院 | Electrical equipment with emergency cooling system and use method thereof |
-
2012
- 2012-01-19 CN CN2012200242914U patent/CN202494483U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102538887A (en) * | 2012-01-19 | 2012-07-04 | 上海华强浮罗仪表有限公司 | Thermal mass flowmeter |
| CN111148972A (en) * | 2017-09-29 | 2020-05-12 | 日立汽车***株式会社 | Physical quantity detecting device |
| CN111148972B (en) * | 2017-09-29 | 2021-04-23 | 日立汽车***株式会社 | Physical quantity detecting device |
| CN112234482A (en) * | 2020-10-29 | 2021-01-15 | 河南水利与环境职业学院 | Electrical equipment with emergency cooling system and use method thereof |
| CN112234482B (en) * | 2020-10-29 | 2022-08-09 | 河南水利与环境职业学院 | Electrical equipment with emergency cooling system and use method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121017 Termination date: 20140119 |