CN2145373Y - Electronic distant-reading manometer with digital display - Google Patents
Electronic distant-reading manometer with digital display Download PDFInfo
- Publication number
- CN2145373Y CN2145373Y CN 92237415 CN92237415U CN2145373Y CN 2145373 Y CN2145373 Y CN 2145373Y CN 92237415 CN92237415 CN 92237415 CN 92237415 U CN92237415 U CN 92237415U CN 2145373 Y CN2145373 Y CN 2145373Y
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- CN
- China
- Prior art keywords
- output terminal
- amplifier
- input end
- circuit
- pressure
- 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
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- Measuring Fluid Pressure (AREA)
Abstract
The utility model relates to an electronic distant-reading manometer with digital display which relates to the technical field of fluid pressure measurement. The utility model comprises a pressure sensor, a microwave filter which is connected with the pressure sensor through shielding lines, a difference amplifier, a zero setting circuit, an analogue to digital converter, a decoder and a digital displayer, wherein, the difference amplifier, the zero setting circuit, the analogue to digital converter, the decoder and the digital displayer are orderly connected with the output end of the microwave filter in series. Having the characteristics of strong anti-interference capability, high measuring accuracy and little possibility of generating electric arc spark, the utility model is particularly suitable to be used in inflammable and explosive places.
Description
The utility model relates to the measuring fluid pressure technical field.
In some commercial production, not only need to understand at any time the situation of change of production run medium pressure, and measured medium pressure need be remained in certain scope.For satisfying this needs, generally be to adopt the mechanical compression table, this mechanical compression table has following deficiency: 1 can only cause reading error easily near observing by the size of measuring pressure; 2 can only be installed in test site, can not make troubles to pressure detection and automatic control the force value teletransmission; 3 because contact easily produces arc spark in the moment that is switched on or switched off, and can not be used for inflammable and explosive place.
The purpose of this utility model be design a kind of can teletransmission, the tensimeter that shows of numeral, this tensimeter does not produce arc spark, is applicable to automatic control system.
This electronic type teletransmission digital display manometer comprises pressure transducer, output terminal at pressure transducer is connected to wave filter by strip line, the output terminal of wave filter is serially connected with differential amplifier, zeroing circuit, analog to digital converter, code translator and nixie display successively, the power circuit of foregoing circuit; Pressure transducer is a resistance strain gage; Wave filter is two RC wave filters of symmetry over the ground; Differential amplifier comprises that input end is connected with the output terminal of RC wave filter respectively in the same way, prime amplifier that reverse input end is connected on the two ends of a common resistance respectively, be made of two integrated operational amplifiers and the difference output amplifier that is connected with the output terminal of this prime amplifier, is made of integrated operational amplifier; Zeroing circuit comprises input end grounding in the same way, reverse input end is connected with the output terminal of difference output amplifier, the potentiometer that the zero amplifier that is made of integrated operational amplifier is connected with the output terminal of difference output amplifier with travelling arm, two fixed arms are connected with the positive-negative output end of power circuit by a resistance; Analog to digital converter and code translator are made of integrated circuit separately; The driving amplifier that nixie display comprises that the digital display tube that is connected with the output terminal of code translator is connected with the output terminal of analog to digital converter with input end, output terminal is connected with digital display tube, be made of triode; Power circuit comprises power transformer, this power transformer has two secondary winding, be connected on one of them secondary winding and can export positive and negative two groups of half-wave rectification filter regulator circuits of symmetrical DC voltage over the ground, be connected to the full-wave rectifier filter mu balanced circuit of supply pressure probe power on another secondary winding.
This electronic type teletransmission digital display manometer is the voltage signal that pressure transducer is converted to correspondence with the variable signal of measured medium pressure, through the strip line teletransmission, behind filter filtering, send into differential amplifier, after zeroing circuit, send into analog to digital converter again, convert voltage signal to digital quantity, behind code translator, carry out numeral by nixie display and show.Because the main components and parts in the table adopt integrated circuit, thus have high common-mode rejection ratio, input impedance height, the offset voltage drift is little, antijamming capability is strong; Owing to adopted digital demonstration, thereby measuring accuracy height; Owing to can show the laggard line number word of electric signal teletransmission of the tested intermediate value pressure of reflection, and the electric contact in the table do not produce arc spark, so the inflammable and explosive occasion of particularly suitable.
In order to satisfy the user to the automatic control of measured medium pressure and the needs of warning, also be provided with identical in structure in the table and cross pressure-controlled alerting signal generator and under-voltage control alerting signal generator, the two all is by the pressure initialization circuit, pressure comparer and pusher constitute, wherein the pressure initialization circuit comprises integrated operational amplifier, the potentiometer that between the positive output end of the input end in the same way of this integrated operational amplifier and power circuit, is connected, the switch and the potentiometer of between its signal input part of reverse input end and analog to digital converter, connecting, the pressure comparer is that input end is connected with the output terminal of zeroing circuit in the same way, the integrated operational amplifier that reverse input end is connected with the output terminal of the integrated operational amplifier of pressure initialization circuit, pusher is that input end is connected with the output terminal of pressure comparer, load is the control alarm appliance, the amplifier that is made of triode.
Accompanying drawing shows the embodiment of this electronic type teletransmission digital display manometer, wherein Fig. 1 is the block scheme of embodiment, Fig. 2 is wave filter, differential amplifier, zeroing circuit, cross the electrical schematic diagram of pressure-controlled alerting signal generator and under-voltage control alerting signal generator, Fig. 3 is the electrical schematic diagram of analog to digital converter, code translator and nixie display, Fig. 4 is the electrical schematic diagram of resistance strain gage, and Fig. 5 is the power circuit electrical schematic diagram.
In the present embodiment, electronic type teletransmission digital display manometer comprises the pressure transducer (1) that is made of resistance strain gage, is connected to by R by strip line at the output terminal of pressure transducer (1)
1C
1R
2C
2The wave filter (2) that constitutes, the output terminal of wave filter (2) is connected to differential amplifier (3), and differential amplifier (3) comprises by integrated operational amplifier A
1, A
2The prime amplifier that constitutes be connected the difference output amplifier A that constitutes by integrated operational amplifier with the output terminal of this prime amplifier
3, at A
3Output terminal be connected to zeroing circuit (4), it comprises by integrated operational amplifier A
4The zero amplifier and the R that constitute
3, RW
1, R
16, R
17, analog to digital converter (5) is by IC
2, IC
3Constitute, code translator (6) is by IC
1Constitute, nixie display (7) is by LED light-emitting nixie tube VT
3-VT
7The driving amplifier that constitutes constitutes, wherein VT
7Be negative sign driver, TV
7Show during conducting on the occasion of, by the time show negative value.Crossing pressure-controlled alerting signal generator (9) comprises by W
1, SB
1With integrated operational amplifier A
5The upper limit pressure initialization circuit (11) that constitutes, by integrated operational amplifier A
7The upper limit pressure comparer (12) that constitutes and by triode VT
1The upper limit pressure pusher (13) that constitutes, under-voltage control alerting signal generator (10) comprises by W
2, SB
2With integrated operational amplifier A
8The threshold pression initialization circuit (14) that constitutes is by integrated operational amplifier A
8The threshold pression comparer (15) that constitutes and by triode VT
2The threshold pression pusher (16) that constitutes, VT
1Load KR
1And VT
2Load KR
2Performer for control and warning.Power circuit (8) comprises power transformer B, and B has two secondary winding, is connected to by D on one of them secondary winding
1, C
6, IC
4, C
8, IC
5, C
10With by D
2, C
7, IC
6, C
9, IC
7, C
11Two groups of half-wave rectification filter regulator circuits, one group of output+6V, another organizes output-6V, at IC
4, IC
5Common public access point place, the output terminal of drawing an output+12V is connected to by D on another secondary winding
3-D
6, C
12, IC
8, C
13The full-wave rectifier filter mu balanced circuit that constitutes, the potential difference (PD) of its two output terminals is 15V, the supply pressure probe power.
In the present embodiment, A
1-A
4A shared LM124 four computing integrated packages, A
5, A
6Select the single computing integrated package of MA741 for use, A
7, A
8Select the two voltage comparator integrated packages of IR9393 for use, IC
1Select MC14511RE for use, IC
2Select MC14433P for use, IC
3Select 1403 for use, IC
4And IC
6Select 7812 for use, IC
5Select 7806 for use, IC
7Select 7906 for use.
Claims (2)
1, a kind of electronic type teletransmission digital display manometer, it is characterized in that comprising pressure transducer (1), output terminal at pressure transducer (1) is connected to wave filter (2) by strip line, the output terminal of wave filter (2) is serially connected with differential amplifier (3), zeroing circuit (4), analog to digital converter (5), code translator (6) and nixie display (7), the power circuit of foregoing circuit (8) successively; Pressure transducer (1) is a resistance strain gage; Wave filter (2) is two RC wave filters of symmetry over the ground; Differential amplifier (3) comprises that input end is connected with the output terminal of RC wave filter respectively in the same way, reverse input end is connected on two ends, the prime amplifier that is made of two integrated operational amplifiers of service message resistance and a difference output amplifier that is connected with the output terminal of this prime amplifier, is made of integrated operational amplifier altogether respectively; Zeroing circuit (4) comprises the potentiometer that the zero amplifier that input end grounding, reverse input end are connected with the output terminal of difference output amplifier in the same way, be made of integrated operational amplifier is connected with the output terminal of difference output amplifier with lever arm, two fixed arms are connected with the positive-negative output end of power circuit (8) by a resistance; Analog to digital converter (5) and code translator (6) are made of integrated circuit separately; The driving amplifier that nixie display (7) comprises that the digital display tube that is connected with the output terminal of code translator (6) is connected with the output terminal of analog to digital converter (5) with input end, output terminal is connected with digital display tube, be made of triode; Power circuit (8) comprises power transformer, this power transformer has two secondary winding, be connected on one of them secondary winding and can export positive and negative two groups of half-wave rectification filter regulator circuits of symmetrical DC voltage over the ground, be connected to the full-wave rectifier filter mu balanced circuit of supply pressure probe power on another secondary winding.
2, according to the described electronic long-distance transmission digital display manometer of claim 1, it is characterized in that also being provided with identical in structure and cross pressure-controlled alerting signal generator (9) and under-voltage control alerting signal generator (10), the two all is by the pressure initialization circuit, pressure comparer and pusher constitute, wherein, the pressure initialization circuit comprises integrated operational amplifier, the potentiometer that between the positive output end of the input end in the same way of this integrated operational amplifier and power circuit (8), is connected, the switch and the potentiometer of between its signal input part of reverse input end and analog to digital converter (5), connecting, the pressure comparer is that input end is connected with the output terminal of zeroing circuit (4) in the same way, the integrated operational amplifier that reverse input end is connected with the output terminal of the integrated operational amplifier of pressure initialization circuit, pusher are that input end is connected with the output terminal of pressure comparer, load is the control alarm appliance, the amplifier that constitutes by triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92237415 CN2145373Y (en) | 1992-11-06 | 1992-11-06 | Electronic distant-reading manometer with digital display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92237415 CN2145373Y (en) | 1992-11-06 | 1992-11-06 | Electronic distant-reading manometer with digital display |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2145373Y true CN2145373Y (en) | 1993-11-03 |
Family
ID=33778697
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92237415 Expired - Fee Related CN2145373Y (en) | 1992-11-06 | 1992-11-06 | Electronic distant-reading manometer with digital display |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2145373Y (en) |
-
1992
- 1992-11-06 CN CN 92237415 patent/CN2145373Y/en not_active Expired - Fee Related
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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 |