CN204788766U - Pressure transmitter - Google Patents
Pressure transmitter Download PDFInfo
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- CN204788766U CN204788766U CN201520495499.8U CN201520495499U CN204788766U CN 204788766 U CN204788766 U CN 204788766U CN 201520495499 U CN201520495499 U CN 201520495499U CN 204788766 U CN204788766 U CN 204788766U
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- electric capacity
- pin
- integrated circuit
- xtr101
- resistance
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Abstract
The utility model provides a pressure transmitter, including XTR101 integrated circuit, XTR101 integrated circuit's 1 fixed contact who connects first potentiometre of pin, 2 another fixed contact that connect first potentiometre of pin, 3 one end of connecting first electric capacity of pin, 4 one end of connecting second electric capacity of pin, 5 fixed contact that connect the second potentiometre of pin, another fixed contact of second potentiometre and the movable contact of second potentiometre are connected to pin 6, 7 other ends of connecting first electric capacity of pin, the other end of second electric capacity, the one end of third electric capacity, the one end of first resistance and the one end of fourth electric capacity, the other end of fourth electric capacity and the negative pole of preventing anti - diode are connected to pin 8, pin 11 is connected to pin 10, 14 one end of connecting second resistance of pin, the movable contact of first potentiometre is connected to the other end of second resistance, the other end of third electric capacity is connected to the other end of first resistance. The utility model provides a pressure transmitter, can improve pressure signal the interference killing feature, reduce the signal loss.
Description
Technical field
The utility model relates to sensor detecting field, particularly a kind of pressure unit.
Background technology
Pressure transducer is a kind of sensor the most conventional in industrial practice, it is widely used in various industrial automatic control environment, relates to numerous industries such as water conservancy and hydropower, railway traffic, intelligent building, production automatic control, Aero-Space, military project, petrochemical industry, oil well, electric power, boats and ships, lathe, pipeline.Pressure transducer is for experiencing the pressure of liquid, gas or steam to produce pressure signal, pressure signal is transformed into 4 ~ 20mA DC signal output through pressure unit, carries out measuring, indicating and procedure regulation to supply the secondary instruments such as indicator alarm, registering instrument, regulator.Pressure transducer divides capacitance pressure transducer, diffusion silicon pressure sensor, ceramic pressure sensor and strain pressure transducer etc.
In commercial Application, pressure transducer is all mounted near test point, and display device or opertaing device are generally all on pulpit or switch board, and distance may tens of rice extremely hundreds of rice between the two.And signal is easy to be subject to external interference and produces loss in long range propagation process, finally affect the precision of pressure detection, therefore need to provide the pressure unit that a kind of antijamming capability is strong, loss of signal is little.
Utility model content
Problem to be solved in the utility model is to provide a kind of pressure unit, adopts two-wire system electric current loop sending pressure signal, to improve signal antijamming capability, to reduce loss of signal.
For solving the problem, the utility model provides a kind of pressure unit, comprises XTR101 integrated circuit, the first potentiometer, the second potentiometer, the first resistance, the second resistance, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity and counnter attack diode; the pin 1 of described XTR101 integrated circuit connects a fixed contact of described first potentiometer, the pin 2 of described XTR101 integrated circuit connects another fixed contact of described first potentiometer, the pin 3 of described XTR101 integrated circuit connects described one end of first electric capacity and the negative output terminal of pressure transducer, the pin 4 of described XTR101 integrated circuit connects described one end of second electric capacity and the positive output end of pressure transducer, the pin 5 of described XTR101 integrated circuit connects a fixed contact of described second potentiometer, the pin 6 of described XTR101 integrated circuit connects another fixed contact of described second potentiometer and the moving contact of described second potentiometer, the pin 7 of described XTR101 integrated circuit connects the other end of described first electric capacity, the other end of described second electric capacity, one end of described 3rd electric capacity, one end of described first resistance and one end of described 4th electric capacity as the negative output terminal of described pressure unit, the pin 8 of described XTR101 integrated circuit connects the other end of described 4th electric capacity and the negative pole of described counnter attack diode, the pin 10 of described XTR101 integrated circuit connects the pin 11 of described XTR101 integrated circuit and the power end of pressure transducer, the pin 14 of described XTR101 integrated circuit connects one end of described second resistance, the other end of described second resistance connects the moving contact of described first potentiometer, the other end of described first resistance connects the described other end of the 3rd electric capacity and the earth terminal of pressure transducer, the positive pole of described counnter attack diode is as the positive output end of described pressure unit.
XTR101 integrated circuit includes high precision table amplifier, a voltage to current converter and two identical 1mA precision constant current sources, the current signal that the voltage signal of pressure transducer automatically can be transformed to standard transmits, simultaneously for pressure transducer is powered, do not need additionally for pressure transducer provides power supply.Transmit owing to pressure signal to be converted to two-wire system DC current, the current signal antijamming capability of transmission is strong and can overcome the defect that long range propagation makes voltage drop, namely reduces loss of signal.
Optionally, the maximum resistance of described first potentiometer is 100k Ω, and the maximum resistance of described second potentiometer is 100 Ω.
Optionally, the resistance value of described first resistance is 2.5k Ω.
Optionally, the resistance value of described second resistance is 1M Ω.
Optionally, described pressure transducer is MPX7200 integrated circuit.
Optionally, the capacitance of described first electric capacity, described second electric capacity, described 3rd electric capacity and described 4th electric capacity is 0.01 μ F.
Compared with prior art, the utility model has the following advantages:
The pressure unit that the utility model provides, by MPX7200 integrated circuit, pressure signal is converted to the transmission of two-wire system DC current signal, the current signal antijamming capability of transmission is strong and can overcome the defect that long range propagation makes voltage drop, namely reduces loss of signal.Further, MPX7200 integrated circuit can be that pressure transducer is powered by built-in precision constant current source, does not need, additionally for pressure transducer provides power supply, to reduce the cost of pressure detection.
Accompanying drawing explanation
Fig. 1 is the structural representation of the pressure unit of the utility model embodiment.
Embodiment
Below in conjunction with embodiment and accompanying drawing, to the detailed description further of the utility model do, but embodiment of the present utility model is not limited thereto.
Fig. 1 is the structural representation of the pressure unit of the utility model embodiment, and described pressure unit comprises XTR101 integrated circuit, the first potentiometer W1, the second potentiometer W1, the first resistance R1, the second resistance R2, the first electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3, the 4th electric capacity C4 and counnter attack diode D1.
Particularly, the pin 1 of described XTR101 integrated circuit connects a fixed contact of described first potentiometer W1, the pin 2 of described XTR101 integrated circuit connects another fixed contact of described first potentiometer W1, the pin 3 of described XTR101 integrated circuit connects described one end of first electric capacity C1 and the negative output terminal of pressure transducer, the pin 4 of described XTR101 integrated circuit connects described one end of second electric capacity C2 and the positive output end of pressure transducer, the pin 5 of described XTR101 integrated circuit connects a fixed contact of described second potentiometer W2, the pin 6 of described XTR101 integrated circuit connects another fixed contact of described second potentiometer W2 and the moving contact of described second potentiometer W2, the pin 7 of described XTR101 integrated circuit connects the other end of described first electric capacity C1, the other end of described second electric capacity C2, one end of described 3rd electric capacity C3, one end of described first resistance R1 and one end of described 4th electric capacity C4 as the negative output terminal of described pressure unit, the pin 8 of described XTR101 integrated circuit connects the other end of described 4th electric capacity C4 and the negative pole of described counnter attack diode D1, the pin 10 of described XTR101 integrated circuit connects the pin 11 of described XTR101 integrated circuit and the power end of pressure transducer, the pin 14 of described XTR101 integrated circuit connects one end of described second resistance R2, the other end of described second resistance R2 connects the moving contact of described first potentiometer W1, the other end of described first resistance R1 connects the described other end of the 3rd electric capacity C3 and the earth terminal of pressure transducer, the positive pole of described counnter attack diode D1 is as the positive output end of described pressure unit.The positive output end of described pressure unit is circulation injection side, is namely suitable for the anode connecting external dc voltage source; The negative output terminal of described pressure unit is circulation output terminal, is namely suitable for the negative terminal being connected external dc voltage source by external load resistors.
Can selecting according to practical application of described pressure transducer.In the present embodiment, for described pressure transducer for X-type silicon pressure sensor MPX7200 is described.The sensing unit of pressure transducer MPX7200 is the piece transverse piezoresistive strain gauge that arrangement forms cross shape on silicon diaphragm.When electric current passes through the axis of this cross strainometer, perpendicular other direction just can produce the output signal be directly proportional to pressure.Because the signalling channel of pressure transducer MPX7200 is short, thus its anti-noise degree is very high.
When the pressure chamber pressurized of pressure transducer MPX7200, its positive output end (2 pin of pressure transducer MPX7200) and negative output terminal (4 pin of pressure transducer MPX7200) export corresponding voltage signal to the pin 3 of described XTR101 integrated circuit and the pin 4 of described XTR101 integrated circuit, amplify through described XTR101 lsi internal circuit and after voltage/current conversion, export corresponding 4 ~ 20mA electric current by the pin 7 of described XTR101 integrated circuit and the pin 8 of described XTR101 integrated circuit to current loop.
The pin 14 external described first potentiometer W1 and described second resistance R2 of the pin 1 of described XTR101 integrated circuit, the pin 2 of described XTR101 integrated circuit and described XTR101 integrated circuit, forms initial zero setting circuit, namely regulates 4mA initial zero position; The pin 5 of described XTR101 integrated circuit and the external described second potentiometer W2 of the pin 6 of described XTR101 integrated circuit, can expire amplitude by regulation output; The pin 10 of described XTR101 integrated circuit and the pin 11 of described XTR101 integrated circuit export 1mA constant current respectively, namely provide the constant current-supplying of 2mA to pressure transducer MPX7200.Described pressure unit also arranges pin 3 filtering that described first electric capacity C1 is described XTR101 integrated circuit, pin 4 filtering that described second electric capacity C2 is described XTR101 integrated circuit is set, the interference in input signal can be reduced, improve the precision of pressure detection.Described pressure unit also arranges the pin 7 and pin 8 filtering that described 4th electric capacity C4 is described XTR101 integrated circuit, can reduce the interference in outputing signal.The steady current that described XTR101 integrated circuit improves is converted to voltage by described first resistance R1, and described 3rd electric capacity C3 is parallel to the two ends of described first resistance R1, carries out filtering process to the pressure reduction at described first resistance R1 two ends.
In the present embodiment, the maximum resistance of described first potentiometer W1 is 100k Ω, the maximum resistance of described second potentiometer W2 is 100 Ω, the resistance value of described first resistance R1 is 2.5k Ω, the resistance value of described second resistance R2 is 1M Ω, and the capacitance of described first electric capacity C1, described second electric capacity C2, described 3rd electric capacity C3 and described 4th electric capacity C4 is 0.01 μ F.It should be noted that, the parameter of above-mentioned each device also can adjust when circuit debugging.
The above; it is only preferred embodiment of the present utility model; not do any pro forma restriction to the utility model, every any simple modification, equivalent variations done above embodiment according to technical spirit of the present utility model, all falls within protection domain of the present utility model.
Claims (6)
1. a pressure unit, is characterized in that, comprises XTR101 integrated circuit, the first potentiometer, the second potentiometer, the first resistance, the second resistance, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity and counnter attack diode;
The pin 1 of described XTR101 integrated circuit connects a fixed contact of described first potentiometer, the pin 2 of described XTR101 integrated circuit connects another fixed contact of described first potentiometer, the pin 3 of described XTR101 integrated circuit connects described one end of first electric capacity and the negative output terminal of pressure transducer, the pin 4 of described XTR101 integrated circuit connects described one end of second electric capacity and the positive output end of pressure transducer, the pin 5 of described XTR101 integrated circuit connects a fixed contact of described second potentiometer, the pin 6 of described XTR101 integrated circuit connects another fixed contact of described second potentiometer and the moving contact of described second potentiometer, the pin 7 of described XTR101 integrated circuit connects the other end of described first electric capacity, the other end of described second electric capacity, one end of described 3rd electric capacity, one end of described first resistance and one end of described 4th electric capacity as the negative output terminal of described pressure unit, the pin 8 of described XTR101 integrated circuit connects the other end of described 4th electric capacity and the negative pole of described counnter attack diode, the pin 10 of described XTR101 integrated circuit connects the pin 11 of described XTR101 integrated circuit and the power end of pressure transducer, the pin 14 of described XTR101 integrated circuit connects one end of described second resistance, the other end of described second resistance connects the moving contact of described first potentiometer, the other end of described first resistance connects the described other end of the 3rd electric capacity and the earth terminal of pressure transducer, the positive pole of described counnter attack diode is as the positive output end of described pressure unit.
2. pressure unit according to claim 1, is characterized in that, the maximum resistance of described first potentiometer is 100k Ω, and the maximum resistance of described second potentiometer is 100 Ω.
3. pressure unit according to claim 1, is characterized in that, the resistance value of described first resistance is 2.5k Ω.
4. pressure unit according to claim 1, is characterized in that, the resistance value of described second resistance is 1M Ω.
5. pressure unit according to claim 1, is characterized in that, described pressure transducer is MPX7200 integrated circuit.
6. pressure unit according to claim 1, is characterized in that, the capacitance of described first electric capacity, described second electric capacity, described 3rd electric capacity and described 4th electric capacity is 0.01 μ F.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520495499.8U CN204788766U (en) | 2015-07-10 | 2015-07-10 | Pressure transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520495499.8U CN204788766U (en) | 2015-07-10 | 2015-07-10 | Pressure transmitter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204788766U true CN204788766U (en) | 2015-11-18 |
Family
ID=54528786
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520495499.8U Expired - Fee Related CN204788766U (en) | 2015-07-10 | 2015-07-10 | Pressure transmitter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204788766U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105043645A (en) * | 2015-07-10 | 2015-11-11 | 四川奇胜科技有限公司 | Pressure transmitter convenient to debug |
-
2015
- 2015-07-10 CN CN201520495499.8U patent/CN204788766U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105043645A (en) * | 2015-07-10 | 2015-11-11 | 四川奇胜科技有限公司 | Pressure transmitter convenient to debug |
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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: 20151118 Termination date: 20200710 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |