CN201145584Y - Pressure transmitter - Google Patents
Pressure transmitter Download PDFInfo
- Publication number
- CN201145584Y CN201145584Y CNU2008200310385U CN200820031038U CN201145584Y CN 201145584 Y CN201145584 Y CN 201145584Y CN U2008200310385 U CNU2008200310385 U CN U2008200310385U CN 200820031038 U CN200820031038 U CN 200820031038U CN 201145584 Y CN201145584 Y CN 201145584Y
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Abstract
The utility model relates to a pressure transmitter, which belongs to the transmitter field and comprises a pressure detecting unit, a signal processing unit and a signal output unit, wherein, an output end of the pressure detecting unit is connected with an input end of the signal processing unit, and an output signal of the signal processing unit is transmitted to an input end of the signal output unit. The pressure transmitter is characterized in that: the pressure detecting unit comprises a pressure sensing circuit and an A/D switching circuit; the signal processing unit comprises a singlechip; the output unit comprises analog quantity voltage output, current signal output and alarm point output; an output signal of the pressure sensing circuit is converted by the A/D switching circuit and then transmitted to an input end of the singlechip; and a corresponding output end of the singlechip is respectively connected with the alarm point output and then connected with the analog quantity voltage output and the current signal output through a D/A switching circuit. The pressure transmitter has the advantages of simple calibration process and high precision.
Description
Technical field
The utility model relates to a kind of transmitter, especially a kind of pressure unit.
Background technology
Pressure unit is used for pressure monitoring system; when the pressure in the system changes; produce detection signal; through signal processing unit; change corresponding aanalogvoltage and current signal into; perhaps the corresponding alerting signal of output is set, is used for the pressure and the protection system of detection system according to different alarm set points.General pressure unit is to use mimic channel to calibrate, and process is numerous and diverse, and low precision is unfavorable for production in batches.And in the commercial Application of reality, the way of output of traditional pressure unit is single, is difficult to satisfy the different requirement in the commercial Application.Have in the commercial Application of specific (special) requirements at some, to the requirement difference of alarm set point, not only require alarm set point arbitrarily to set, also require alerting signal time-delay a period of time to export again sometimes, the time of time-delay also requirement can set, and traditional transmitter all can't satisfy these requirements.
Summary of the invention
In order to solve numerous and diverse, the low precision of pressure unit calibration process in the prior art, temperature is floated greatly, and the way of output is single, and alarm set point can not be provided with, and the output of reporting to the police does not have the problem of time-delay, and the utility model provides a kind of novel pressure transmitter, and concrete scheme is:
A kind of pressure unit 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.Described pressure sensing cell comprises pressure sensor circuit and A/D change-over circuit, and signal processing unit comprises single-chip microcomputer, and output unit comprises analog quantity voltage output, current signal output and alarm set point output; The output signal of pressure sensor circuit passes to an input end of single-chip microcomputer after the conversion of A/D change-over circuit; The corresponding output end of single-chip microcomputer connects alarm set point output respectively, connects analog quantity voltage, current signal output through the D/A change-over circuit.
Pressure sensing cell is converted to electric signal with detected pressure signal, sends signal processing unit processes to, and signal output unit adopts single-chip microcomputer, can float and the non-linear digital compensation that carries out skew, sensitivity, the temperature of pressure sensing cell.Output unit comprises analog quantity voltage, current signal output and alarm set point output.The input end of single-chip microcomputer also connects input keyboard.
Described pressure sensor 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 signal processing unit.Also be provided with temperature-compensation circuit in the pressure sensing cell, this circuit is string or thermistor in parallel on Wheatstone bridge, shunt resistance also in parallel on thermistor.This shunt resistance is through laser calibration.Single-chip microcomputer also connects temperature-compensation circuit, and this circuit comprises a digital temperature-sensitive chip, and the output of chip connects the input end of single-chip microcomputer.
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.Add the temperature-compensation circuit of single-chip microcomputer, better suppressed temperature and floated.
The utility model adopts the single-chip microcomputer of intelligence, and the optimization by software, can adjust 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 is converted to analog quantity 0-10V, the output of 4-20mA, the user also can cooperate input keyboard according to the needs at scene the different alarm set points and the time expand of output to be set arbitrarily.
Structurally, signal processing unit and signal output unit are installed in the main body, and pressure sensor circuit is sealed in the Stainless Steel Shell, have increased the corrosion resistance of product greatly.
Compared with prior art, the beneficial effects of the utility model are that the pressure transducer calibration process is simple, precision is high, and alarm set point can be provided with, and the output of reporting to the police can be delayed time.
Description of drawings
Fig. 1 is an outside drawing of the present utility model
Fig. 2 is a schematic block circuit diagram of the present utility model
Fig. 3 is the utility model temperature-compensation circuit synoptic diagram
Among Fig. 1 1. Stainless Steel Shell, 2. O-ring seal, 3. main body, 4. the outer ring, 5. the four-core joint, 6. trim ring, 7. respond to ceramic crystal
Embodiment
The utility model is described in further detail below in conjunction with the drawings and specific embodiments.
A kind of pressure unit 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.Described pressure sensing cell comprises pressure sensor circuit and A/D change-over circuit, and signal processing unit comprises single-chip microcomputer, and output unit comprises analog quantity voltage output, current signal output and alarm set point output; The output signal of pressure sensor circuit passes to an input end of single-chip microcomputer after the conversion of A/D change-over circuit; The corresponding output end of single-chip microcomputer connects alarm set point output respectively, connects analog quantity voltage, current signal output through the D/A change-over circuit.
The input end of single-chip microcomputer also connects input keyboard.Described pressure sensor 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 single-chip microcomputer behind the A/D change-over circuit.Described pressure sensor circuit also connects temperature-compensation circuit.Described temperature-compensation circuit is thermistor of serial or parallel connection on Wheatstone bridge (being to be connected in parallel in the present embodiment), shunt resistance also in parallel on thermistor.Described shunt resistance is through laser calibration.Single-chip microcomputer also connects temperature-compensation circuit, and this circuit comprises a digital temperature-sensitive chip, and the output of chip connects the input end of single-chip microcomputer.
As Fig. 3, temperature-compensation circuit, this circuit are thermistor Rt in parallel on Wheatstone bridge, shunt resistance R5 also in parallel on thermistor.R5 is through laser calibration.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.Single-chip microcomputer also connects temperature-compensation circuit, and this circuit comprises an AD7416 numeral temperature-sensitive chip, and the output of chip connects the input end of single-chip microcomputer.The variation of AD7416 numeral temperature-sensitive chip collecting temperature, and according to the temperature that collects signal is compensated.
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.Add the built-in temperature-compensation circuit of signal processing unit, better suppressed temperature and floated.
Owing to adopt the single-chip microcomputer of intelligence, and the optimization by software, can adjust 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 is converted to analog quantity 0-10V, the output of 4-20mA, the user also can cooperate input keyboard, according to the needs at scene the different alarm set points and the delay time of output is set arbitrarily.
Structurally, signal processing unit and signal output unit are installed in the main body 3, and pressure sensor circuit is sealed in the Stainless Steel Shell 1, has increased the corrosion resistance of product greatly.
Claims (8)
1, a kind of pressure unit 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, the output signal of signal processing unit is delivered to the input end of signal output unit, it is characterized in that described pressure sensing cell comprises pressure sensor circuit and A/D change-over circuit, signal processing unit comprises single-chip microcomputer, and output unit comprises analog quantity voltage output, current signal output and alarm set point output; The output signal of pressure sensor circuit passes to an input end of single-chip microcomputer after the conversion of A/D change-over circuit; The corresponding output end of single-chip microcomputer connects alarm set point output respectively, connects analog quantity voltage, current signal output through the D/A change-over circuit.
2, pressure unit according to claim 1 is characterized in that the input end of described single-chip microcomputer also connects input keyboard.
3, pressure unit according to claim 1 and 2 is characterized in that described pressure sensor 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 single-chip microcomputer behind the A/D change-over circuit.
4, pressure unit according to claim 3 is characterized in that described pressure sensor circuit also connects temperature-compensation circuit.
5, pressure unit according to claim 4, the described temperature-compensation circuit of its feature are to connect a thermistor on Wheatstone bridge, shunt resistance also in parallel on thermistor.
6, pressure unit according to claim 5 is characterized in that described shunt resistance is through laser calibration.
7, pressure unit according to claim 6 is characterized in that described single-chip microcomputer also connects temperature-compensation circuit, and this circuit comprises a digital temperature-sensitive chip, and the output of chip connects the input end of single-chip microcomputer.
8, pressure unit according to claim 7, it is levied is that described pressure sensor circuit is sealed in the Stainless Steel Shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200310385U CN201145584Y (en) | 2008-01-24 | 2008-01-24 | Pressure transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200310385U CN201145584Y (en) | 2008-01-24 | 2008-01-24 | Pressure transmitter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201145584Y true CN201145584Y (en) | 2008-11-05 |
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ID=40082468
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200310385U Expired - Fee Related CN201145584Y (en) | 2008-01-24 | 2008-01-24 | Pressure transmitter |
Country Status (1)
| Country | Link |
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| CN (1) | CN201145584Y (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102032975A (en) * | 2010-12-15 | 2011-04-27 | 天津肯泰仪表有限公司 | Sensor conversion circuit for pressure transmitter |
| CN102530673A (en) * | 2011-12-26 | 2012-07-04 | 许宾 | Digital pulling force alarm device |
| CN102652269A (en) * | 2010-01-21 | 2012-08-29 | 三菱电机株式会社 | Ultrasonic wave sensor and method for attaching ultrasonic wave sensor |
| CN103900742A (en) * | 2013-08-13 | 2014-07-02 | 苏州伊玛传感技术科研有限公司 | Pressure transmitter |
| CN105698983A (en) * | 2016-03-02 | 2016-06-22 | 伊玛精密电子（苏州）有限公司 | Corrosion-resisting all-metal pressure transmitter |
| CN109974923A (en) * | 2019-03-15 | 2019-07-05 | 上海电仪仪器仪表有限公司 | A kind of pressure transmitter configurations |
| 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 |
-
2008
- 2008-01-24 CN CNU2008200310385U patent/CN201145584Y/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102652269A (en) * | 2010-01-21 | 2012-08-29 | 三菱电机株式会社 | Ultrasonic wave sensor and method for attaching ultrasonic wave sensor |
| CN102652269B (en) * | 2010-01-21 | 2015-09-30 | 三菱电机株式会社 | The installation method of ultrasonic sensor and ultrasonic sensor |
| CN102032975A (en) * | 2010-12-15 | 2011-04-27 | 天津肯泰仪表有限公司 | Sensor conversion circuit for pressure transmitter |
| CN102032975B (en) * | 2010-12-15 | 2012-05-23 | 中环天仪股份有限公司 | Sensor conversion circuit for pressure transmitter |
| CN102530673A (en) * | 2011-12-26 | 2012-07-04 | 许宾 | Digital pulling force alarm device |
| CN102530673B (en) * | 2011-12-26 | 2014-09-03 | 许宾 | Digital pulling force alarm device |
| CN103900742A (en) * | 2013-08-13 | 2014-07-02 | 苏州伊玛传感技术科研有限公司 | Pressure transmitter |
| CN103900742B (en) * | 2013-08-13 | 2016-03-16 | 苏州伊玛传感技术科研有限公司 | Pressure unit |
| CN105698983A (en) * | 2016-03-02 | 2016-06-22 | 伊玛精密电子（苏州）有限公司 | Corrosion-resisting all-metal pressure transmitter |
| CN109974923A (en) * | 2019-03-15 | 2019-07-05 | 上海电仪仪器仪表有限公司 | A kind of pressure transmitter configurations |
| 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 |
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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: 20081105 Termination date: 20160124 |
|
| EXPY | Termination of patent right or utility model |