CN2624198Y - Intelligent differential pressure transmitter - Google Patents
Intelligent differential pressure transmitter Download PDFInfo
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- CN2624198Y CN2624198Y CN 03234206 CN03234206U CN2624198Y CN 2624198 Y CN2624198 Y CN 2624198Y CN 03234206 CN03234206 CN 03234206 CN 03234206 U CN03234206 U CN 03234206U CN 2624198 Y CN2624198 Y CN 2624198Y
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- differential pressure
- converter
- circuit
- microprocessor
- pressure transmitter
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Abstract
The utility model relates to an intelligent differential pressure transmitter which comprises a differential pressure transducer, a voltage taking containing chamber, a circuit transmitting box and a transmitting circuit, wherein the transmitting circuit is composed of a differential pressure transducer output circuit, a programmable operational amplifier, an A/D converter, a microprocessor, a display and key circuit, a D/A converter and a two-wire system constant-current output circuit. The programmable operational amplifier, the A/D converter, the microprocessor and the D/A converter can adopt one or more single machines to accomplish, and the single chip machine adopts MSC1210Y< X > series. Each integer value of the intelligent differential pressure transmitter in the top limit measuring range ability can be defined as leaving factory range measuring range top limit; according to the users' requirement in using, selecting some measuring range top limit entering can change the differential pressure measuring range. The users can select some measuring range ability when buying meters or designing without moving to somewhere with normal pressure source and corresponding measuring means to change measuring range correction.
Description
Technical field the utility model relates to a kind of intelligent differential pressure transmitter that is applied to industries such as oil, chemical industry, metallurgy, environmental protection and city be public, belongs to the industrial automation instrument technical field.
The background technology differential pressure transmitter is one of most widely used field instrument in the industrial automation instrument.Form by adjusting potentiometer, full scale adjustment potentiometer and 4-20mA constant-current circuit at differential pressure pick-up, signal amplification circuit, zero point.A differential pressure range scope of determining according to order goods requirement or product export specification during product export mixes up zero point and full scale.And in actual use when regular meeting need change range ability because of changes in process parameters or other reason, just can only could realize in the place that possesses standard pressure generator and corresponding measurement means, bring many inconveniences to use.In addition, adjust potentiometer and full scale adjustment potentiometer zero point, make troubles for normal the use because transmitter has.
The deficiency that the content of utility model exists at above-mentioned prior art, the purpose of this utility model provides a kind ofly can carry out differential pressure range without standard pressure generator and zero point and full scale adjustment and change, insert required differential pressure range numeral by a button on the differential pressure transmitter, just can finish differential pressure range resets, need not add standard pressure generator, without the intelligent differential pressure transmitter of zero point and full scale potentiometer.
The purpose of this utility model is achieved in that intelligent differential pressure transmitter, comprise differential pressure pick-up, pressure room, transmission circuit box and transmission circuit, transmission circuit is made up of differential pressure pick-up output circuit, programmable operational amplifier, A/D converter, microprocessor, D/A converter, two-wire system constant current output circuit and demonstration and key circuit; Output, the input port of differential pressure pick-up output circuit, programmable operational amplifier, A/D converter, microprocessor, D/A converter and two-wire system constant current output circuit connect successively, and the microprocessor ports having connects and shows and key circuit.
Described programmable operational amplifier, A/D converter, microprocessor and D/A converter can be selected one or more chip microcontroller for use.Single-chip microcomputer is selected MSC1210Y for use
XSeries.
Described differential pressure pick-up is a SPDS monocrystalline silicon differential pressure series sensor, and described power module is a TPS77030 series.It is the XTR115 type that the D/A output of single-chip microcomputer directly drives the 4-20mA constant-current circuit.
The utility model is formed upthrow at circuit and has been abandoned traditional circuit-mode, adopted by microprocessor, programmable amplifier, high-precision a/d converter and D/A converter and two-wire system constant current output circuit and formed the complete circuit of to sample, judge, handling.This intelligent differential pressure transmitter each round values in the upper limit range ability of differential pressure pick-up all may be defined as the range upper limit of dispatching from the factory.The user in use can select wherein a certain range higher limit to insert as required can change differential pressure range.The user needn't move the place that possesses standard pressure generator and corresponding measurement means again to and remove to carry out range adjustment purchasing table or not having the selected a certain range ability of timing to get final product.
The utility model can be with the arbitrary round values in the differential pressure pick-up range ability as upper limit range, and corresponding this range ability output 4-20mA electric current.The user only needs with one on the transmitter button to be set in use and inserts the numeral of the required range upper limit and get final product.The same on its surface structure with common differential pressure transmitter, form by differential pressure pick-up, pressure room, transmission circuit box and transmission circuit.Because the inner digitized processing that adopts of circuit, each grade range upper limit and zero point all can not produce drift, and in circuit, removed in the original differential pressure transmitter and to have adjusted potentiometer requisite zero point and full scale is adjusted potentiometer, improved the reliability and stability of instrument greatly, realized that the user does not need pressure source and carry out the function that measurement range selection is set by a button in the differential pressure transmitter.
Description of drawings Fig. 1 is an external structure synoptic diagram of the present utility model.
Fig. 2 is the utility model internal circuit configuration block diagram.
Fig. 3 is the embodiment circuit diagram of Fig. 2.
Fig. 4 is the utility model workflow diagram.
The utility model is described in further detail below in conjunction with drawings and Examples for embodiment:
As shown in Figure 1, intelligent differential pressure transmitter is made up of transmission circuit box 1, differential pressure pick-up 2, pressure room 3 and transmission circuit, and 4 is tie down screws of room among the figure.
As shown in Figure 2, the circuit of intelligent differential pressure transmitter is made up of differential pressure pick-up output circuit 5, programmable operational amplifier 6, A/D converter 7, microprocessor 8, demonstration and key circuit 9, D/A converter 10, two-wire system constant current output circuit 11.The output port of differential pressure pick-up output circuit 5, programmable operational amplifier 6, A/D converter 7, microprocessor 8, D/A converter 10 and two-wire system constant current output circuit 11 connects successively, and the port of microprocessor 8 also connects and shows and key circuit 9.
As shown in Figure 3, intelligent differential pressure transmitter one example circuit is: two-wire system constant current output circuit 11 connects 24V voltage, and to single-chip microcomputer 13, differential pressure pick-up 5 and power module 12 (TPS77030) output 5V voltage, power module 12 (TPS77030) provide 3V voltage to single-chip microcomputer 13; Differential pressure pick-up 5 is selected SPDS4 or SPDS3 type monocrystalline silicon differential pressure pick-up for use, and single-chip microcomputer 13 is selected MSC1210 for use; The output circuit of differential pressure pick-up 5 connects the input port of single-chip microcomputer 13 (MSC1210), and single-chip microcomputer 13 (MSC1210) ports having connects LCD plate 14 and button 15.The D/A output 4-20mA constant-current circuit of single-chip microcomputer is the XTR115 type.Finish the function of above-mentioned programmable operational amplifier 6, A/D converter 7, microprocessor 8, demonstration and key circuit 9 and D/A converter 10 by single-chip microcomputer 13 (MSC1210).
MSC1210Y
XSeries is high integrated mixed signal components and parts.Inside is integrated 24 high precision Δ-2ADC, 8 passage multiway analog switches, selectable buffer input, the programmable gain amplifier of 1-128 (PGA), Temperature Detector, Voltage Reference, 8 8-digit microcontrollers, 8051 kernels, the flash reservoir of 32KB and the static data storer of 1KB.And have special evaluation board.
Its principle of work is as follows:
1. the enlargement factor of programmable operational amplifier is 1-128 times, its effect is less than normal in the differential pressure pick-up output signal, under the little situation that can not guarantee conversion resolution to A/D converter, instruction enlargement factor according to microprocessor is amplified signal, and the signal after the amplification send microprocessor after sending A/D converter to convert digital signal to.
2.A/D the converter conversion accuracy is 24,16777216 numbers do not have the sign indicating number of leakage.Its effect is that the simulating signal 0-2.5V of programmable operational amplifier output is converted to digital signal.Under the situation of programmable operational amplifier output 0-2.5V, its resolution is 0.149 microvolt.
3. the course of work of circuit is all carried out under the control of microprocessor.Microprocessor carries 16 D/A outputs, and 65536 digital 0-20mA that represent export.Resolution reaches 3276 sign indicating numbers and represents 1mA, and 1 sign indicating number is represented 0.3 microampere.Utilize 1-128 programme controlled amplifying power and 24 A/D converter 16777216 numbers doubly of programmable operational amplifier not have the A/D converter that leaks sign indicating number, guarantee in differential pressure pick-up upper limit range ability, to carry out the realization of the setting of the integer range upper limit.
4. the D/A of microprocessor output directly drives the 4-20mA constant-current circuit.65536 sign indicating numbers are represented 20mA, and zero point, 4mA had 13107 hand over words.
The implementation that the intelligent differential pressure transmitter range is freely set is exemplified below:
With the 0-5Kpa-50Kpa range ability, corresponding output signal is that the differential pressure pick-up of 0-50mv-500mv is an example, analyzes the implementation procedure that the intelligent differential pressure transmitter range is freely set below.
The maximum differential pressure upper limit of this differential pressure pick-up is 50Kpa, and it is 5Kpa that lowest difference presses limit, and output signal is 500mv during maximum differential pressure upper limit 50Kpa.Lowest difference presses in limited time, and output signal is 50mv.The all exportable 4-20mA of setting of the arbitrary integer in the middle of will realizing now from 5Kpa to 50Kpa.
Be limited to 0-10Kpa on the range of supposing to need now to set.500mv/50000Pa=0.01mv/1Pa the output of differential pressure pick-up is every 1Pa differential pressure signal the electric signal output of 0.01mv is arranged.The 10Kpa differential pressure is upward 10000 * 0.01mv=100mv output signal should be arranged in limited time, microprocessor sends the instruction of amplifying 16 times and gives program control amplifier, the output of program control amplifier becomes 1600mv, and this 1600mv obtains 1600/0.000149=10738255 hand over word after 24 A/D conversions.Little processing receives that the differential pressure of this 10738255 correspondence is 10000Pa.At this moment the A/D turnover number of 1Pa differential pressure correspondence has 1073, and resolution is enough high.
Microprocessor has 16 D/A conversion, and be 4 mA output zero point of differential pressure transmitter.65536/20÷4＝13107。With the output code of corresponding 65536-13107=52429 the 16mA of 10738255 differential pressure range hand over words just.That is to say 13107 sign indicating numbers of microprocessor output to D/A, transmitter just has the output of 4 mA.52429 sign indicating numbers of microprocessor output are given D/A, and transmitter just has the output of 16 mA.
If the same upper limit range of setting is 0-12Kpa, the output that program control amplifier amplification is 16 times becomes 1920mv, this 1920mv obtains 1920/0.000149=12885906 hand over word after A/D conversion, with the output code of 52429 16mA of 12885906 differential pressure range hand over words correspondences just.
If the upper limit range of setting is 0-42Kpa, the output that program control amplifier amplification is 4 times becomes 1680mv, this 1680mv obtains 1680/0.000149=11275167 hand over word after A/D conversion, with the output code of 52429 16mA of 11275167 differential pressure range hand over words correspondences just.
The intelligent differential pressure transmitter workflow diagram is referring to Fig. 4.
Claims (6)
1, intelligent differential pressure transmitter, comprise differential pressure pick-up, pressure room, transmission circuit box and transmission circuit, it is characterized in that transmission circuit is made up of differential pressure pick-up output circuit, programmable operational amplifier, A/D converter, microprocessor, demonstration and key circuit, D/A converter, two-wire system constant current output circuit; Output, the input port of differential pressure pick-up output circuit, programmable operational amplifier, A/D converter, microprocessor, D/A converter and two-wire system constant current output circuit connect successively, and the microprocessor ports having connects and shows and key circuit.
2, intelligent differential pressure transmitter according to claim 1 is characterized in that described programmable operational amplifier, A/D converter, microprocessor and D/A converter can select one or more chip microcontroller for use.
3, intelligent differential pressure transmitter according to claim 2 is characterized in that described single-chip microcomputer selects MSC1210Y for use
XSeries.
4, intelligent differential pressure transmitter according to claim 1 is characterized in that described differential pressure pick-up is a SPDS type monocrystalline silicon differential pressure pick-up.
5, intelligent differential pressure transmitter according to claim 1 is characterized in that described power module is a TPS77030 series.
6, intelligent differential pressure transmitter according to claim 1, the D/A that it is characterized in that described single-chip microcomputer is output as the 4-20mA constant-current circuit and selects the XTR115 type for use.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03234206 CN2624198Y (en) | 2003-04-28 | 2003-04-28 | Intelligent differential pressure transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03234206 CN2624198Y (en) | 2003-04-28 | 2003-04-28 | Intelligent differential pressure transmitter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2624198Y true CN2624198Y (en) | 2004-07-07 |
Family
ID=34249058
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03234206 Expired - Fee Related CN2624198Y (en) | 2003-04-28 | 2003-04-28 | Intelligent differential pressure transmitter |
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| Country | Link |
|---|---|
| CN (1) | CN2624198Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102778327A (en) * | 2012-07-05 | 2012-11-14 | 西安交通大学 | High-performance intelligent sensor digital transmitting system |
| CN111537774A (en) * | 2020-06-05 | 2020-08-14 | 镇江英创电力电子有限公司 | Multi-range high-precision high-voltage isolation transmitter and calibration method |
| CN114166385A (en) * | 2021-12-03 | 2022-03-11 | 上海洛丁森工业自动化设备有限公司 | Transmitter circuit device, pressure transmitter and application thereof and pressure instrument |
-
2003
- 2003-04-28 CN CN 03234206 patent/CN2624198Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102778327A (en) * | 2012-07-05 | 2012-11-14 | 西安交通大学 | High-performance intelligent sensor digital transmitting system |
| CN111537774A (en) * | 2020-06-05 | 2020-08-14 | 镇江英创电力电子有限公司 | Multi-range high-precision high-voltage isolation transmitter and calibration method |
| CN114166385A (en) * | 2021-12-03 | 2022-03-11 | 上海洛丁森工业自动化设备有限公司 | Transmitter circuit device, pressure transmitter and application thereof and pressure instrument |
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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 |