CN201069402Y - Intelligent pressure sensor - Google Patents
Intelligent pressure sensor Download PDFInfo
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- CN201069402Y CN201069402Y CNU2007200404424U CN200720040442U CN201069402Y CN 201069402 Y CN201069402 Y CN 201069402Y CN U2007200404424 U CNU2007200404424 U CN U2007200404424U CN 200720040442 U CN200720040442 U CN 200720040442U CN 201069402 Y CN201069402 Y CN 201069402Y
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- 230000001419 dependent effect Effects 0.000 claims description 8
- 238000001514 detection method Methods 0.000 abstract description 6
- 238000000034 method Methods 0.000 description 11
- 239000000523 sample Substances 0.000 description 10
- 238000010586 diagram Methods 0.000 description 4
- 238000003825 pressing Methods 0.000 description 4
- 238000005070 sampling Methods 0.000 description 4
- 239000011888 foil Substances 0.000 description 3
- 230000003993 interaction Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 230000006399 behavior Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003278 mimic effect Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/02—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in ohmic resistance, e.g. of potentiometers, electric circuits therefor, e.g. bridges, amplifiers or signal conditioning
- G01L9/04—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in ohmic resistance, e.g. of potentiometers, electric circuits therefor, e.g. bridges, amplifiers or signal conditioning of resistance-strain gauges
- G01L9/045—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in ohmic resistance, e.g. of potentiometers, electric circuits therefor, e.g. bridges, amplifiers or signal conditioning of resistance-strain gauges with electric temperature compensating means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L27/00—Testing or calibrating of apparatus for measuring fluid pressure
- G01L27/002—Calibrating, i.e. establishing true relation between transducer output value and value to be measured, zeroing, linearising or span error determination
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
An intelligent pressure sensor is provided, which comprises a pressure detection unit, a signal processing unit and a signal output unit. The output end of the pressure detection unit is connected with the input end of the signal processing unit. The signal output from the signal processing unit is transmitted to the input end of the signal output unit. The signal processing unit has a SCM which is connected with the signal output unit. The signal output unit comprises a display unit, an on-off output, and an analog voltage and current signal output. The output signal from the pressure detection unit is sent to the input end of the SCM via an A/D switch circuit. The output end of the SCM is connected with the display unit and the on-off output. The output end of the SCM is connected with the analog voltage and current signal output via a D/A switch circuit. Compared with the prior art, the utility model has the advantages of simple correction of pressure sensor, high accuracy, multiple output modes, and output delay.
Description
Technical field
The utility model relates to a kind of sensor, especially a kind of pressure transducer.
Background technology
Pressure transducer is used for pressure monitoring system, when the pressure in the system reaches the pressure threshold of setting, produces detection signal, is used to protect the interlock protection system.General ceramic pressure sensor is to use mimic channel to calibrate.Process is numerous and diverse, low precision, and be unfavorable for production in batches.And in the commercial Application of reality, the way of output of traditional pressure transducer is single, is difficult to satisfy the different requirement in the commercial Application.In addition, have in the commercial Application of specific (special) requirements at some, require signal lag a period of time to export again, the length of time-delay has different requirements, and traditional sensor then can't satisfy these requirements.
Summary of the invention
In order to solve numerous and diverse, the low precision of pressure transducer calibration process in the prior art, the way of output is single and export the problem of not having time-delay, and the utility model provides a kind of intelligent pressure transducer, and concrete scheme is:
A kind of intelligent pressure transducer comprises pressure sensing cell, signal processing unit and signal output unit.The output terminal of pressure sensing cell connects the input end of signal processing unit, and the output signal of signal processing unit is delivered to the input end of signal output unit.Signal processing unit adopts single-chip microcomputer, and single-chip microcomputer connects signal output unit.Signal output unit comprises display unit, switching value output, analog quantity voltage and current signal output.The output signal of described pressure sensing cell is sent into the input end of single-chip microcomputer through the A/D change-over circuit, and the output terminal of single-chip microcomputer connects display unit and switching value output, and the output terminal of single-chip microcomputer also connects the output of analog quantity voltage and current signal by the D/A change-over circuit.
Pressure sensing cell is provided with pressure sensor circuit, and this circuit is the back side that voltage dependent resistor (VDR) is printed on a diaphragm, connects into a Wheatstone bridge, and the output of electric bridge connects the A/D change-over circuit.Voltage dependent resistor (VDR) is the voltage dependent resistor (VDR) through parameter calibration or correction.Also be provided with temperature-compensation circuit in the pressure sensing cell, this circuit is thermistor of series/parallel on Wheatstone bridge, shunt resistance also in parallel on thermistor.Shunt resistance is the resistance through parameter calibration or correction.
Switching value output comprises PNP and NPN output.
By foregoing circuit,, can realize in conjunction with corresponding software:
1. under the prerequisite that guarantees output accuracy, adopt the method for digital calibration, and adopt the pressure probe of special high-quality, make this pressure transducer not only be easy to calibrate and have excellent temperature stability.
1. digital calibration is for the analog calibration method, under the situation that does not have other impressed pressures (at atmospheric pressure), the output voltage of MCU sampling probe, deposit MCU in as low spot, and then the output voltage of probe when full scale, deposit MCU in, the calculating by formula then as the height point, when pressure changes, provide corresponding value between zero degree and full scale.
2. pressure probe is through laser calibration, and carries temperature compensation, has very high temperature stability and time stability, and it is minimum that the drift of pressure following temperature is dropped to, and can directly contact with the medium of majority.
2. the inner single-chip microcomputer that adopts intelligence, and the optimization by software can be adjusted the speed of sampling according to different requirements, make pressure detection partly sense on-the-spot pressure, through processing of circuit and intelligent computing the force value at scene are shown output.And switching value NPN, PNP and analog quantity 0-10V are arranged, and the output of combination in twos arbitrarily of 4-20mA can freely be selected for the user.
Particularly have hysteresis output function and window output function
1. output lags behind:
If the pressure of system is with default similar, hysteresis phenomenon remains on the state stably of exporting so.When system temperature raise, output terminal can reach the point (SP1) of opening switch; When system temperature reduced again, output terminal can reach the point (rP1) of opening switch. and the method that lags behind and adjust: the point of at first opening switch determines that difference as requested redefines again then.Can be by (DSI) of menu and (DRI) come set pressure to rise and the delay of the output time when descending.
2. window output:
Interaction energy by window monitors clear and definite can receivedly being worth.When system temperature is being opened (SP1) and closed when changing between (rP1), (window role/NO) or disconnect (window role/NC) is connected in output.The different width that can set window by SP1 and rP1.SP1 is top value, and rP1 is following value
3. control knob is respectively " pattern/carriage return " and " pattern/enter " by two, and this is provided with has simplified operation.The operation of button:
When pressing " pattern/carriage return " key very soon, install and be the readable display mode of parameter value.Process that device is inner and output still are operational mode.
Whenever click " pattern/enter " button, a parameter name will occur.
When pressing " set " button fast, the corresponding parameters value shows 5 seconds, and later device was got back to operational mode in 5 seconds.
Structurally, the utility model adopts stainless probe connector, has not only increased the corrosion resistance of product.
Compared with prior art, the beneficial effects of the utility model are that the pressure transducer calibration process is simple, precision is high, and the way of output is various can delay time with output.
Description of drawings
Fig. 1 is an electric theory diagram of the present utility model
Fig. 2 is the utility model hysteresis output function synoptic diagram
Fig. 3 is the utility model window output function synoptic diagram
Fig. 4 is the utility model temperature-compensation circuit synoptic diagram
Embodiment
A kind of intelligent pressure transducer comprises pressure sensing cell, signal processing unit and signal output unit.Described signal processing unit adopts single-chip microcomputer, and signal output unit comprises display unit, switching value NPN and PNP output, analog quantity voltage and current signal output.The output signal of described pressure sensing cell is sent into the input end of single-chip microcomputer through the A/D change-over circuit, the output terminal of single-chip microcomputer connects display unit and switching value NPN and PNP output, and the output terminal of single-chip microcomputer also connects the output of analog quantity voltage and current signal by the D/A change-over circuit.The input end of single-chip microcomputer also connects the external control button.
Described pressure sensing cell is provided with pressure sensor circuit, and this circuit is the back side that voltage dependent resistor (VDR) is printed on diaphragm, connects into a Wheatstone bridge, and the output of electric bridge connects the A/D change-over circuit.This voltage dependent resistor (VDR) is through the laser calibration parameter.As Fig. 4, also be provided with temperature-compensation circuit in the pressure sensing cell, this circuit is thermistor Rt in parallel on Wheatstone bridge, shunt resistance R5 also in parallel on thermistor.R5 is through the laser calibration parameter.As thermistor R
tBe in identical temperature with foil gauge, when the sensitivity of foil gauge descends with the temperature rising, thermistor R
tResistance descend, the input voltage of electric bridge is raise with temperature to be increased, thereby improves the output voltage of electric bridge.Select shunt resistance R
5Value, the influence that foil gauge sensitivity is descended to electric bridge output is well compensated.
By foregoing circuit software control (software is not described in detail at this not at protection domain of the present utility model) in addition, the utility model has been realized following function:
1. under the prerequisite that guarantees output accuracy, adopt the method for digital calibration, and adopt the pressure probe of special high-quality, make this pressure transducer not only be easy to calibrate and have excellent temperature stability.
1. digital calibration is for the analog calibration method, under the situation that does not have other impressed pressures (at atmospheric pressure), the output voltage of MCU sampling probe, deposit MCU in as low spot, and then the output voltage of probe when full scale, deposit MCU in, the calculating by formula then as the height point, when pressure changes, provide corresponding value between zero degree and full scale.
2. pressure probe is through laser calibration, and carries temperature compensation, has very high temperature stability and time stability, and it is minimum that the drift of pressure following temperature is dropped to, and can directly contact with the medium of majority.
2. the inner single-chip microcomputer that adopts intelligence, and the optimization by software can be adjusted the speed of sampling according to different requirements, make pressure detection partly sense on-the-spot pressure, through processing of circuit and intelligent computing the force value at scene are shown output.And switching value NPN, PNP and analog quantity 0-10V are arranged, and the output of combination in twos arbitrarily of 4-20mA can freely be selected for the user.
Particularly have: hysteresis output function and window output function
1. output lags behind: (as Fig. 2)
If the pressure of system is with default similar, hysteresis phenomenon remains on the state stably of exporting so.When system temperature raise, output terminal can reach the point (SP1) of opening switch; When system temperature reduced again, output terminal can reach the point (rP1) of opening switch. and the method that lags behind and adjust: the point of at first opening switch determines that difference as requested redefines again then.Can be by (DSI) of menu (in the table 1) and (DRI) come set pressure to rise and the delay of the output time when descending.
2. window output: (as Fig. 3)
Interaction energy by window monitors clear and definite can receivedly being worth.When system temperature is being opened (SP1) and closed when changing between (rP1), (window role/NO) or disconnect (window role/NC) is connected in output.The different width that can set window by SP1 and rP1.SP1 is top value, and rP1 is following value
3. being provided with of two buttons simplified operation.The operation of button:
When pressing " pattern/carriage return " key very soon, install and be the readable display mode of parameter value.Process that device is inner and output still are operational mode.
Whenever click " pattern/enter " button, a parameter name will occur.
When pressing " set " button fast, the corresponding parameters value shows 5 seconds, and later device was got back to operational mode in 5 seconds.
Structurally, the utility model adopts stainless probe connector.
Table 1 is the utility model display menu.Wherein first classify setup menu as, second classifies the menu function note as, and the 3rd classifies parameter as is provided with scope, and the 4th classifies the note of the scope of setting as, remarks explanation menu object.Last three behaviors of form study is provided with, and its is learnt at different pressure sizes and differences of different regions, and comes calibration that the force value of exporting is offset by the accurate Calculation of MCU, makes the force value of output more accurate.
Table 1:
Claims (6)
1. intelligent pressure transducer, comprise pressure sensing cell, signal processing unit and signal output unit, the output terminal of pressure sensing cell connects the input end of signal processing unit, the output signal of signal processing unit is delivered to the input end of signal output unit, it is characterized in that signal processing unit adopts single-chip microcomputer, single-chip microcomputer connects signal output unit, and signal output unit comprises display unit, switching value output, analog quantity voltage and current signal output; The output signal of described pressure sensing cell is sent into the input end of single-chip microcomputer through the A/D change-over circuit, and the output terminal of single-chip microcomputer connects display unit and switching value output, and the output terminal of single-chip microcomputer also connects the output of analog quantity voltage and current signal by the D/A change-over circuit.
2. intelligent pressure transducer according to claim 1, it is characterized in that pressure sensing cell is provided with pressure sensor circuit, this circuit is the back side that voltage dependent resistor (VDR) is printed on a diaphragm, connects into a Wheatstone bridge, and the output of electric bridge connects the A/D change-over circuit.
3. intelligent pressure transducer according to claim 2 is characterized in that described voltage dependent resistor (VDR) is the voltage dependent resistor (VDR) through parameter calibration or correction.
4. intelligent pressure transducer according to claim 2 is characterized in that also being provided with in the pressure sensing cell temperature-compensation circuit, and this circuit is thermistor of series/parallel on Wheatstone bridge, shunt resistance also in parallel on thermistor.
5. intelligent pressure transducer according to claim 4, the shunt resistance that it is characterized in that temperature-compensation circuit are the resistance through parameter calibration or correction.
6. intelligent pressure transducer according to claim 1 is characterized in that switching value output comprises PNP and NPN output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200404424U CN201069402Y (en) | 2007-07-30 | 2007-07-30 | Intelligent pressure sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200404424U CN201069402Y (en) | 2007-07-30 | 2007-07-30 | Intelligent pressure sensor |
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| Publication Number | Publication Date |
|---|---|
| CN201069402Y true CN201069402Y (en) | 2008-06-04 |
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|---|---|---|---|
| CNU2007200404424U Expired - Fee Related CN201069402Y (en) | 2007-07-30 | 2007-07-30 | Intelligent pressure sensor |
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| Country | Link |
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| CN (1) | CN201069402Y (en) |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102032846A (en) * | 2011-01-04 | 2011-04-27 | 东方电气集团东方电机有限公司 | Pressure calibration device for coil caliper rule of motor |
| CN102095547A (en) * | 2010-11-25 | 2011-06-15 | 苏州工业园区广福汽保机电设备有限公司 | Digital manometer for accurately measuring pressure to be measured |
| CN102221427A (en) * | 2011-05-24 | 2011-10-19 | 李书志 | Intelligent pressure sensor |
| CN103643628A (en) * | 2013-11-16 | 2014-03-19 | 姬志刚 | Bridge support with pressure monitoring function |
| CN103674052A (en) * | 2013-11-20 | 2014-03-26 | 上海电力学院 | Embedded multifunctional pedometer |
| CN106323355A (en) * | 2016-09-04 | 2017-01-11 | 合肥飞鸟信息技术有限公司 | Temperature and humidity sensor simulating device |
| CN106441429A (en) * | 2016-09-04 | 2017-02-22 | 合肥飞鸟信息技术有限公司 | Temperature and humidity transmitter or recorder detection system |
| CN107664553A (en) * | 2017-10-25 | 2018-02-06 | 伊玛精密电子（苏州）有限公司 | A kind of pressure and temp process circuit, the especially pressure thermometer with it |
| CN107664521A (en) * | 2017-09-21 | 2018-02-06 | 南京航伽电子科技有限公司 | Temperature and pressure integral type transmitter and mutually compensate output intent |
| CN110568791A (en) * | 2019-09-02 | 2019-12-13 | 成都英萨传感技术研究有限公司 | Multi-output integrated proximity switch |
| CN110857898A (en) * | 2018-08-22 | 2020-03-03 | 精量电子（深圳）有限公司 | Oil-filled pressure sensor |
| CN112729661A (en) * | 2020-12-29 | 2021-04-30 | 北京金迈捷科技有限公司 | Ultralow temperature pressure sensor with temperature signal output function |
| CN113301190A (en) * | 2021-04-16 | 2021-08-24 | 荣耀终端有限公司 | Pressure sensor and electronic device |
| CN113701923A (en) * | 2020-05-22 | 2021-11-26 | 深圳市特安电子有限公司 | Method, device, terminal and medium for acquiring characteristic curve |
-
2007
- 2007-07-30 CN CNU2007200404424U patent/CN201069402Y/en not_active Expired - Fee Related
Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102095547A (en) * | 2010-11-25 | 2011-06-15 | 苏州工业园区广福汽保机电设备有限公司 | Digital manometer for accurately measuring pressure to be measured |
| CN102032846B (en) * | 2011-01-04 | 2012-07-04 | 东方电气集团东方电机有限公司 | Pressure calibration device for coil caliper rule of motor |
| CN102032846A (en) * | 2011-01-04 | 2011-04-27 | 东方电气集团东方电机有限公司 | Pressure calibration device for coil caliper rule of motor |
| CN102221427A (en) * | 2011-05-24 | 2011-10-19 | 李书志 | Intelligent pressure sensor |
| CN103643628A (en) * | 2013-11-16 | 2014-03-19 | 姬志刚 | Bridge support with pressure monitoring function |
| CN103674052A (en) * | 2013-11-20 | 2014-03-26 | 上海电力学院 | Embedded multifunctional pedometer |
| CN106323355A (en) * | 2016-09-04 | 2017-01-11 | 合肥飞鸟信息技术有限公司 | Temperature and humidity sensor simulating device |
| CN106441429A (en) * | 2016-09-04 | 2017-02-22 | 合肥飞鸟信息技术有限公司 | Temperature and humidity transmitter or recorder detection system |
| CN107664521A (en) * | 2017-09-21 | 2018-02-06 | 南京航伽电子科技有限公司 | Temperature and pressure integral type transmitter and mutually compensate output intent |
| WO2019080657A1 (en) * | 2017-10-25 | 2019-05-02 | 伊玛精密电子（苏州）有限公司 | Pressure and temperature processing circuit, in particular, pressure thermometer having same |
| CN107664553A (en) * | 2017-10-25 | 2018-02-06 | 伊玛精密电子（苏州）有限公司 | A kind of pressure and temp process circuit, the especially pressure thermometer with it |
| CN110857898A (en) * | 2018-08-22 | 2020-03-03 | 精量电子（深圳）有限公司 | Oil-filled pressure sensor |
| CN110568791A (en) * | 2019-09-02 | 2019-12-13 | 成都英萨传感技术研究有限公司 | Multi-output integrated proximity switch |
| CN110568791B (en) * | 2019-09-02 | 2024-02-20 | 成都英萨传感技术研究有限公司 | Multi-output integrated proximity switch |
| CN113701923A (en) * | 2020-05-22 | 2021-11-26 | 深圳市特安电子有限公司 | Method, device, terminal and medium for acquiring characteristic curve |
| CN112729661A (en) * | 2020-12-29 | 2021-04-30 | 北京金迈捷科技有限公司 | Ultralow temperature pressure sensor with temperature signal output function |
| CN112729661B (en) * | 2020-12-29 | 2024-03-19 | 北京金迈捷科技有限公司 | Ultralow-temperature pressure sensor with temperature signal output |
| CN113301190A (en) * | 2021-04-16 | 2021-08-24 | 荣耀终端有限公司 | Pressure sensor and electronic device |
| WO2022218137A1 (en) * | 2021-04-16 | 2022-10-20 | 荣耀终端有限公司 | Pressure sensor and electronic device |
| EP4187888A4 (en) * | 2021-04-16 | 2024-03-13 | Honor Device Co., Ltd. | Pressure sensor and electronic device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080604 Termination date: 20160730 |
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| CF01 | Termination of patent right due to non-payment of annual fee |