CN2800253Y - Bust type pressure transmitter - Google Patents
Bust type pressure transmitter Download PDFInfo
- Publication number
- CN2800253Y CN2800253Y CN 200520090729 CN200520090729U CN2800253Y CN 2800253 Y CN2800253 Y CN 2800253Y CN 200520090729 CN200520090729 CN 200520090729 CN 200520090729 U CN200520090729 U CN 200520090729U CN 2800253 Y CN2800253 Y CN 2800253Y
- Authority
- CN
- China
- Prior art keywords
- microprocessor
- bus
- temperature sensor
- circuit board
- circuit
- 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
Landscapes
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
The utility model relates to a bus type pressure transmitter, which is characterized in that a temperature sensor and a circuit board are fixed in a shell body. The circuit board has the circuit connection relation that a pressure sensor and a temperature sensor are respectively connected with respective programmed control amplifier and an A/D converter, which is connected with a microprocessor. The microprocessor has a plurality of pins which are respectively connected with the program control amplifier, and the A/D converter and a constant current source to form a switching circuit. The digital signal sending end, the receiving end, a protocol processing chip, a modulation-demodulation chip of the microprocessor are connected with a bus in series. The bus type transmitter not only can compensate nonlinearity through software, but also can carry out temperature compensation for the pressure sensor through the temperature sensor. The highest accuracy can reach 0.05 grade and the wide temperature range can reach 0.2 grade after compensation. Various digital filtering methods can be adopted, and possible on-site high-frequency interference can be prevented. The software can be compiled according to technical requirements of a user, and the utility model can realize function exchange with the existing pressure transmitter product.
Description
Technical field
The utility model relates to the physical quantity instrument, a kind of bus type pressure unit of digital transmission.
Background technology
Analog pressure unit generally includes sensor and circuit amplifies, voltage and current signal conversion two parts, see Fig. 2, adopt 4-20mA current delivery single-measurement force value, the signal transmission is unidirectional, can only pass to display unit or other analog digital transition card from transmitter.Detected force value is carried out temperature compensation through the thermistor network, and compensation effect is limited.There are many inconvenience in the use:
1, analog pressure unit precision is generally lower, and is the highest at 0.2 grade; If consider wide warm area, because the discreteness of pressure sensor temperature curve is very big, the compensation difficulty, precision is generally about 1%FS.
2, it is big force value to be carried out the temperature compensation limitation through the thermistor network;
3, analog pressure unit can't directly be connected with the computer control part, needs to be converted to digital quantity through the analog digital card.It is many and random to connect up during networking, and cost is high and difficult in maintenance.
Along with the maturation gradually of large scale integrated circuit and network technology, digital pressure unit replaces analog pressure unit to become the certainty of production development.
Summary of the invention
The purpose of this utility model provides a kind of bus type pressure unit, changes pressure signal into digital signal, utilizes field bus control system, realizes that networked signal transmits, monitors and management.
The bus type pressure unit, used electronic component concentrates on the circuit board, it is characterized in that the annexation of circuit is on the circuit board: pressure transducer, temperature sensor connect programmable amplifier, A/D converter separately respectively and insert microprocessor, microprocessor has a plurality of pins to connect programmable amplifier and A/D converter and constant current source respectively, constitutes change-over circuit; The digital signal transmitting terminal of microprocessor, receiving end, protocol processes chip, modem chip are connected in series with bus.
The bus type transmitter is owing to adopt microprocessor to handle, and dirigibility strengthens greatly, not only can be non-linear by software compensation, can also carry out temperature compensation to pressure transducer by temperature sensor.Compensation back pressure unit precision reaches as high as 0.05 grade, and wide warm area is 0.2 grade.The high frequency interference that adopts multiple digital filtering method can also the scene of preventing to occur.The design can write corresponding software by producer's regulation of industry-by-industry according to user's technical requirement, can realize exchanging on function with the pressure unit product of traditional structure, is convenient to the user and selects to use.By writing specific functional block software, can also realize special function at specific sensor, as multiparameter outputs such as the pressure of this bus pressure unit, temperature etc.The design's transducer signal transmission is two-way, and computing machine can be controlled the output of transmitter, realizes functions such as long-range demarcation adjustment.
Description of drawings
Fig. 1 is the circuit block diagram of the design's bus type pressure unit;
Fig. 2 is the mimic channel block diagram of prior art pressure unit;
Embodiment
The bus type pressure unit utilizes analog pressure unit housing, it is characterized in that temperature sensor is fixed near the pressure transducer, places in the lump in the housing with circuit board, sees Fig. 1; The annexation of circuit is on the circuit board: bus produces voltage source after modem chip is handled, draw connection all electronic components except that sensor respectively, offers two-way constant current source 11 and the required operating voltage of all the other electronic components of 200 μ A; Pressure transducer 1 connects its programmable amplifier 3, A/D converter 5, inserts microprocessor 7; Temperature sensor 2 connects its programmable amplifier 4, A/D converter 6, inserts microprocessor 7; Microprocessor 7 has a plurality of pins to connect programmable amplifier 3,4 and A/D converter 5,6 respectively, and constant current source 11, constitutes change-over circuit.The digital signal transmission of microprocessor 7, receiving end connection protocol process chip 8, protocol processes chip 8 connect modem chip 9, modem chip 9 connecting bus 10, can realize the transmitted in both directions of signal.
Above-mentioned microprocessor 7 is CPU (central processing unit) of bus pressure unit, and its workflow is: power on the back initialization, constant current source switching, A/D conversion, linearization, temperature compensation, pass to the dpc31 chip by user's predetermined processing functional block software, data.Also carry out corresponding software programs simultaneously, the operation of control constant current source 11,3,4 and 16 A/D converters 5,6 of programmable amplifier and protocol processes chip 8.The measured value that protocol processes chip 8 circuit are handled digitized microprocessor 7, carry out processing data packets by the bus data link layer, after modem chip 9 circuit are modulated to the electric current model with protocol processes chip 8 circuit output datas, utilize original a couple power supply bus 10 real-time Transmission to give the bus computer control system, not only saved cable, but also anti-interference.Protocol treatment circuit 8 adopts the dpc31 chip, it finishes the service and the protocol specification of PROFIBUS bus data link layer, comprise medium accesses mode and host-host protocol, transmitting step, circulation and system response time, the controlled step of makeing mistakes, frame structure, frame format etc.Modulation-demodulation circuit 9 adopts general SIM1 chip, and it is modulated into digital signal ± and the 9mA current impulse is added on the power supply loop bus 10.
Claims (2)
1, bus type pressure unit, used electronic component concentrates on the circuit board, it is characterized in that the annexation of circuit is on the circuit board: pressure transducer, temperature sensor connect programmable amplifier, A/D converter separately respectively and insert microprocessor, microprocessor has a plurality of pins to connect programmable amplifier and A/D converter and constant current source respectively, constitutes change-over circuit; The digital signal transmitting terminal of microprocessor, receiving end, protocol processes chip, modem chip are connected in series with bus.
2, bus type pressure unit according to claim 1, it is characterized in that: temperature sensor is fixed near the pressure transducer, places in the housing in the lump with circuit board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520090729 CN2800253Y (en) | 2005-05-13 | 2005-05-13 | Bust type pressure transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520090729 CN2800253Y (en) | 2005-05-13 | 2005-05-13 | Bust type pressure transmitter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2800253Y true CN2800253Y (en) | 2006-07-26 |
Family
ID=36842750
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520090729 Expired - Fee Related CN2800253Y (en) | 2005-05-13 | 2005-05-13 | Bust type pressure transmitter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2800253Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101236113B (en) * | 2007-02-01 | 2011-03-16 | 上海飞恩微电子有限公司 | All-bridge type piezoresistance type pressure sensor digital type signal conditioning chip |
| CN104949797A (en) * | 2015-05-27 | 2015-09-30 | 重庆川仪自动化股份有限公司 | Temperature and pressure compensation method for pressure/differential pressure sensors |
| CN104977116A (en) * | 2015-07-10 | 2015-10-14 | 四川奇胜科技有限公司 | Micro-differential voltage transmitter |
-
2005
- 2005-05-13 CN CN 200520090729 patent/CN2800253Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101236113B (en) * | 2007-02-01 | 2011-03-16 | 上海飞恩微电子有限公司 | All-bridge type piezoresistance type pressure sensor digital type signal conditioning chip |
| CN104949797A (en) * | 2015-05-27 | 2015-09-30 | 重庆川仪自动化股份有限公司 | Temperature and pressure compensation method for pressure/differential pressure sensors |
| CN104949797B (en) * | 2015-05-27 | 2017-12-29 | 重庆川仪自动化股份有限公司 | Pressure/differential pressure type sensor temperature and pressure compensation method |
| CN104977116A (en) * | 2015-07-10 | 2015-10-14 | 四川奇胜科技有限公司 | Micro-differential voltage transmitter |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN2800253Y (en) | Bust type pressure transmitter | |
| CN103905410A (en) | Multi-channel communication protocol converter capable of converting user-defined protocol to Modbus protocol | |
| CN201514284U (en) | Temperature sensor with HART communication module | |
| CN201514245U (en) | Flow sensor with HART communication module | |
| CN203414770U (en) | Novel pressure transmitter | |
| CN105550154A (en) | Single-bus time division multiplexing based two-way transmission system and method thereof | |
| CN203219328U (en) | Multiplex communication protocol converter | |
| CN207799397U (en) | A kind of GPRS types RTU with suspend mode revival function | |
| CN104155891B (en) | I＜2＞C-based networked transmitter and communication implementation method thereof | |
| Postolache et al. | IEEE 1451.4 embedded smart sensors architecture for wheelchair user monitoring | |
| CN204241137U (en) | Two-wire system intelligent pressure transmitter | |
| CN204612811U (en) | Support the intelligent multi-channel temperature transmitter of FF agreement | |
| CN102706411A (en) | Magnetic position material level meter based on HART (highway addressable remote transducer) communication | |
| CN201311584Y (en) | Data gathering device of digital display gauge based on Bluetooth | |
| CN201467170U (en) | Communication protocol converter capable of converting HART protocol to Profibus protocol | |
| CN102305670A (en) | Thermocouple temperature transducer in real-time wireless communication industry | |
| CN103616086B (en) | Thermal resistance temperature transmitter | |
| CN206489707U (en) | One kind has wire center | |
| CN204758198U (en) | Intelligent little differential pressure transmitter | |
| CN110011887A (en) | A kind of data transmission system based on picogram bus | |
| CN207799398U (en) | A kind of RTU with I2C bus interface | |
| CN202060763U (en) | Medical monitor adopting universal module connector | |
| CN208610828U (en) | A kind of ambulatory blood pressure monitors with Remote configuration measurement interval function | |
| CN204575211U (en) | A kind of temperature transmitter | |
| CN216524201U (en) | High-resolution electronic water gauge |
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 |