CN2338734Y - Thermal type mass flow sensor - Google Patents
Thermal type mass flow sensor Download PDFInfo
- Publication number
- CN2338734Y CN2338734Y CN 98224228 CN98224228U CN2338734Y CN 2338734 Y CN2338734 Y CN 2338734Y CN 98224228 CN98224228 CN 98224228 CN 98224228 U CN98224228 U CN 98224228U CN 2338734 Y CN2338734 Y CN 2338734Y
- Authority
- CN
- China
- Prior art keywords
- mass flow
- operational amplifier
- resistance
- platinum
- sensor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Measuring Volume Flow (AREA)
Abstract
The utility model discloses a thermal type mass flow sensor, which comprises a sensing circuit that is formed by the electrical connection of an operational amplifier U with a bridge circuit which is composed of two platinum thermal resistors R1 and R2, and two resistors R3 and R4, wherein, the two platinum thermal resistors R1 and R2 are both enclosed in a metal case to form a sensing element which is positioned in a pipe with fluids to be measured. The utility model is widely suitable for measuring the mass flow of various gases, such as air, coal gas, natural gas, methane gas, etc., and can also be used for measuring the mass flow of liquids.
Description
The utility model relates to a kind of thermal mass flow sensor.
In prior art, about the measurement of gas mass flow is to adopt the measuring system of being made up of sensor-based system and secondary instrument to finish, it generally all comprises speed flowrate meter or differential pressure flowmeter and pressure, temperature transmitter described sensor-based system, and therefore described sensor-based system complex structure, volume are greatly, wiring is complicated, measuring error is big, cost is high, use is inconvenient.But do not find to replace the function of described gas mass flow sensor-based system so far as yet, the measuring equipment of gas mass flow is oversimplified and high precision int with a sensor.
The purpose of this utility model be to provide a kind of directly relevant with gas or liquid quality flow, do not need to add the temperature and pressure compensation, simple in structure, volume is little, precision is high, install and use and all conveniently can substitute the thermal mass flow sensor that has gas mass flow sensor-based system function now.
The purpose of this utility model is achieved in that this thermal mass flow sensor device, it is characterized in that it comprises a sensing circuit, it is by operational amplifier U with by platinum resistance thermometer sensor, R1 for this sensing circuit, R2, resistance R 3, the bridge circuit that R4 four resistance are formed forms through being electrically connected: the end of the thermoelectric R1 of described platinum and the equal ground connection of an end of R2, the other end of its platinum resistance thermometer sensor, R1 links to each other with the negative terminal of described operational amplifier U and an end of resistance R 3 respectively, the other end of its platinum resistance thermometer sensor, R2 links to each other with the anode of described operational amplifier U and an end of resistance R 4 respectively, and the other end of described resistance R 3 and R4 all links to each other with the output terminal of described operational amplifier U;
Described two platinum resistance thermometer sensor, R1 and R2 all are encapsulated in and constitute a sensing element in the metal shell, and this sensing element is inserted in the pipeline of detected fluid.
It comprises a sensing circuit thermal mass flow sensor described in the utility model, it is formed this sensing circuit through being electrically connected by the bridge circuit that operational amplifier and four resistance R 1～R4 form, and described two platinum resistance thermometer sensor, R1 and R2 are encapsulated in sensing element of formation in the metal shell, this sensing element can directly be inserted and do not needed to add temperature and pressure compensation just can accurately measure mass rate in the pipeline of detected fluid (gas or liquid), therefore the utlity model has simple in structure, volume is little, precision is high, install and use advantages such as all convenient.The utility model can substitute the sensor-based system of existing gas mass flow fully, thereby has realized the high precision int and the simplification of mass rate testing apparatus.
Concrete structure of the present utility model is provided by following embodiment and accompanying drawing thereof.
Fig. 1 is the structural representation of sensor described in the utility model.
Fig. 2 is the structural representation of sensing element described in the utility model.
Describe structure in detail below in conjunction with Fig. 1 and Fig. 2 according to concrete sensor described in the utility model.
This thermal mass flow sensor device, it comprises a sensing circuit 1, it is by operational amplifier U with by platinum resistance thermometer sensor, R1 for this sensing circuit 1, R2, resistance R 3, the bridge circuit that R4 four resistance are formed forms through being electrically connected: the end of the thermoelectric R1 of described platinum and the equal ground connection of an end of R2, the other end of its platinum resistance thermometer sensor, R1 links to each other with the negative terminal of described operational amplifier U and an end of resistance R 3 respectively, the other end of its platinum resistance thermometer sensor, R2 links to each other with the anode of described operational amplifier U and an end of resistance R 4 respectively, and the other end of described resistance R 3 and R4 all links to each other with the output terminal of described operational amplifier U;
Described two platinum resistance thermometer sensor, R1 and R2 all are encapsulated in and constitute a sensing element 3 in the metal shell 2, and this sensing element 3 is inserted in the pipeline 4 of detected fluid.
Described operational amplifier U can adopt integrated circuit op-07 type.
Claims (3)
1. thermal mass flow sensor device, it is characterized in that it comprises a sensing circuit, it is by operational amplifier U with by platinum resistance thermometer sensor, R1 for this sensing circuit, R2, resistance R 3, the bridge circuit that R4 four resistance are formed forms through being electrically connected: the end of the thermoelectric R1 of described platinum and the equal ground connection of an end of R2, the other end of its platinum resistance thermometer sensor, R1 links to each other with the negative terminal of described operational amplifier U and an end of resistance R 3 respectively, the other end of its platinum resistance thermometer sensor, R2 links to each other with the anode of described operational amplifier U and an end of resistance R 4 respectively, and the other end of described resistance R 3 and R4 all links to each other with the output terminal of described operational amplifier U;
Described two platinum resistance thermometer sensor, R1 and R2 are encapsulated in and constitute a sensing element in the metal shell, and this sensing element is inserted in the pipeline of detected fluid.
2. thermal mass flow sensor according to claim 1 is characterized in that described operational amplifier U can adopt integrated circuit op-07 type.
3. thermal mass flow sensor according to claim 1, it is characterized in that metal shell in the described sensing element can adopt the metal circular tube of end closure, in this metal circular tube, be packaged with two metal tubes that length is inequality, described platinum resistance thermometer sensor, R1 is encapsulated in the described long metal pipe, and described platinum resistance thermometer sensor, R2 is encapsulated in the described short metal tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98224228 CN2338734Y (en) | 1998-06-08 | 1998-06-08 | Thermal type mass flow sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98224228 CN2338734Y (en) | 1998-06-08 | 1998-06-08 | Thermal type mass flow sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2338734Y true CN2338734Y (en) | 1999-09-15 |
Family
ID=33975143
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98224228 Expired - Fee Related CN2338734Y (en) | 1998-06-08 | 1998-06-08 | Thermal type mass flow sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2338734Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101311684B (en) * | 2007-05-21 | 2012-03-21 | Abb股份公司 | Thermal mass flow meter and method for its operation |
| CN1982855B (en) * | 2005-12-16 | 2012-12-12 | 三菱电机株式会社 | Thermal flow rate sensor supplying digital output |
| CN104523276A (en) * | 2014-12-23 | 2015-04-22 | 清华大学 | Respiration monitoring nasal paste and respiratory airflow monitoring system |
| CN110672171A (en) * | 2012-02-21 | 2020-01-10 | 日立汽车系统株式会社 | Thermal air flow measuring device |
-
1998
- 1998-06-08 CN CN 98224228 patent/CN2338734Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1982855B (en) * | 2005-12-16 | 2012-12-12 | 三菱电机株式会社 | Thermal flow rate sensor supplying digital output |
| CN101311684B (en) * | 2007-05-21 | 2012-03-21 | Abb股份公司 | Thermal mass flow meter and method for its operation |
| CN110672171A (en) * | 2012-02-21 | 2020-01-10 | 日立汽车系统株式会社 | Thermal air flow measuring device |
| CN110672171B (en) * | 2012-02-21 | 2021-07-13 | 日立汽车系统株式会社 | Flow rate measuring device having flow rate detecting element disposed in sub-passage |
| CN104523276A (en) * | 2014-12-23 | 2015-04-22 | 清华大学 | Respiration monitoring nasal paste and respiratory airflow monitoring system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH02222815A (en) | Correction of fluid composition for flowmeter | |
| CN102735300B (en) | Gas flowmeter and gas flow rate measuring method | |
| CN210741584U (en) | Wet gas flow metering device | |
| CN106840292A (en) | MEMS thermal mass gas meter apparatus and measuring gas flow rate method | |
| CN202255473U (en) | Intelligent quake-proof vortex precession flow meter | |
| CN201188012Y (en) | Laminar flowmeter for measuring instantaneous flow of engine | |
| CN2338734Y (en) | Thermal type mass flow sensor | |
| CN103206997B (en) | Gas Roots flow measuring device and flow correction method for same | |
| CN108709594A (en) | A kind of gas flowmeter and gas flow measurement method | |
| US11512990B2 (en) | Gas meter with thermal time-of-flight sensing | |
| CN211904339U (en) | On-line detection standard device for small-flow gas flowmeter | |
| CN217032612U (en) | Small-flow gas volume flow measuring device | |
| CN208350151U (en) | It is a kind of can long-range meter reading thermal type gas quality flow meter | |
| CN208350144U (en) | A kind of gas flowmeter | |
| CN2478078Y (en) | Vortex street flow sensor having function of measuring temp | |
| CN112857503B (en) | Small-flow gas volume flow measuring device | |
| CN201107067Y (en) | Mass flux electronic gas meter for household | |
| CN206056692U (en) | A kind of MEMS thermal mass gas meter, flow meters equipped with many bypass measurement apparatus | |
| CN221404377U (en) | Multi-parameter wide-range integrated throttling flowmeter | |
| CN212779412U (en) | Small-sized thermal gas mass flowmeter | |
| CN220752062U (en) | Hydrogen sensor test system | |
| CN221350774U (en) | Integrated sampler comprehensive calibration device | |
| CN215952705U (en) | Glass tube rotameter scale measuring equipment | |
| CN220230665U (en) | Gas flow measuring device | |
| CN202083418U (en) | Integrated Verabar flow meter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |