CN203848957U - Intelligent pressure transmitter - Google Patents
Intelligent pressure transmitter Download PDFInfo
- Publication number
- CN203848957U CN203848957U CN201420198111.3U CN201420198111U CN203848957U CN 203848957 U CN203848957 U CN 203848957U CN 201420198111 U CN201420198111 U CN 201420198111U CN 203848957 U CN203848957 U CN 203848957U
- Authority
- CN
- China
- Prior art keywords
- cdc
- pressure transmitter
- output
- electric capacity
- intelligent 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
An intelligent pressure transmitter comprises a capacitance sensor; a signal output of the capacitance sensor is connected with an input of a CDC capacitance transition chip; an output of the CDC capacitance transition chip is connected with an input of a CPU digital processing and operation module; an output of the CPU digital processing and operation module is connected with an input of a DAC converter; the DAC converter outputs 24V 4-20mA signals; the intelligent pressure transmitter is simple in circuit, greatly reduced in size, less affected by temperature influence, convenient in usage, and is easy to understand, operate and record.
Description
Technical field
The utility model relates to a kind of pressure unit, is specifically related to a kind of intelligent pressure transmitter.
Background technology
At present domestic existing be that old know-why by inductor oscillating is to be first converted to electric signal, then carry out AD sampling, this method is by conversion several times, inductance is subject to extraneous shadow, not only degree of stability is poor, and is subject to temperature shadow large, thereby has limited to the high-precision development of domestic pressure transmitter.
Abroad, as U.S.'s like product, need Special debugging instrument, in instrument, only have simple zeroing to adjust full function, use very inconveniently, affect production efficiency; Germany and japanese product, also be there is no the above-mentioned operating function making the best of both worlds, specific purpose tool is expensive, some users are in order to reduce expenses, do not buy corresponding tool, cause can not abundant sharp instrument function, often do an appearance, would rather complete by hand some tests, greatly waste due resource.
To sum up, the shortcoming of prior art is exactly: precision is not high, and job insecurity is subject to temperature shadow obvious, and field adjustable is complicated.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art, the purpose of this utility model is to provide a kind of intelligent pressure transmitter, and stability, precision, the temperature that improves instrument float, reduce power consumption, use and have more hommization, enhance productivity etc.
In order to achieve the above object, the technical scheme that the utility model is taked is:
A kind of intelligent pressure transmitter, comprise capacitive transducer 1, the signal output of capacitive transducer 1 is connected with the input of CDC electric capacity conversion chip 2, the output of CDC electric capacity conversion chip 2 is connected with CPU digital processing and computing module 3 inputs, 4 inputs are connected with DAC converter for CPU digital processing and computing module 3 outputs, DAC converter 4 output 24V, 4-20mA signal.
Described CDC electric capacity conversion chip 2 directly utilizes the electric capacity conversion CDC technology of high precision 24 bit resolutions.
Described CPU digital processing and computing module 3 adopt coding rotary switch 5 to control.
Advantage of the present utility model: circuit is simpler and easy, the large minimizing of volume, temperature influence is less, directly utilizes the electric capacity conversion CDC technology of high precision 24 bit resolutions, has improved measuring accuracy, reduces temperature and floats, Direct Digital output; At client's use side, in conjunction with user habit, field adjustable, has done more humane design, has utilized two rotary code switchs to debug, and is mainly 0 adjustment and Common Parameters and resets function, easy to use, understandable, easy to operate, easy to remember.Use novel chip in recent years, power consumption is little, expansion interference performance is strong, and compatible traditional debugging acid.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Fig. 2 is the circuit diagram of the utility model CDC electric capacity conversion chip 2.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in detail.
With reference to Fig. 1, a kind of intelligent pressure transmitter, comprise capacitive transducer 1, the signal output of capacitive transducer 1 is connected with the input of CDC electric capacity conversion chip 2, the output of CDC electric capacity conversion chip 2 is connected with CPU digital processing and computing module 3 inputs, 4 inputs are connected with DAC converter for CPU digital processing and computing module 3 outputs, DAC converter 4 output 24V, 4-20mA signal.
With reference to Fig. 2, described CDC electric capacity conversion chip 2 directly utilizes the electric capacity conversion CDC technology of high precision 24 bit resolutions, this CDC chip internal is with exciting signal source, and there is an automatic ride gain, and be converted to digital quantity, enter again I2C bus and carry out communication, well conveniently carry out the sampling to capacitive transducer.
Described CPU digital processing and computing module 3 adopt coding rotary switch 5 to control.
Principle of work of the present utility model:
When capacitive transducer 1 is stressed, produce small change of distance, electric capacity changes thereupon, by taking of CDC electric capacity conversion chip 2, just can obtain the numerical value of capacitance variations, thereby realizes pressing force measurement; CPU digital processing and computing module 3 are that data are processed, groundwork is for to demarcate and linearization procedure pressure, also can carry out temperature compensation, communication, on-the-spot adjustment etc., DAC converter 4 is converted to analog current 4-20mA signal the data of measuring and supplies with long-range control system use, and use two-wire system, signal wire that need not be other, current value when 4mA refers to 0 pressure, force value when 20mA is full scale, it and pressure are linear; Rotary encoder 5 modules design for realizing the more convenient use of user, in most of erecting stagies, all will debug, for example adjust zero point, range is reseted, and these are in this function, can obtain more humane operation, for example: adjust zero point, only need enter left rotation and right rotation at ZERO scrambler, just can conveniently return to zero, this circuit has two scramblers, and the use that combines, can enter menu, carry out other configuration function, and without the additional instruments such as computer.
Claims (3)
1. an intelligent pressure transmitter, comprise capacitive transducer (1), it is characterized in that: the signal output of capacitive transducer (1) is connected with the input of CDC electric capacity conversion chip (2), the output of CDC electric capacity conversion chip (2) is connected with CPU digital processing and computing module (3) input, input is connected with DAC converter (4) in CPU digital processing and computing module (3) output, DAC converter (4) output 24V, 4-20mA signal.
2. a kind of intelligent pressure transmitter according to claim 1, is characterized in that: described CDC electric capacity conversion chip (2) directly utilizes the electric capacity conversion CDC technology of high precision 24 bit resolutions.
3. a kind of intelligent pressure transmitter according to claim 1, is characterized in that: described CPU digital processing and computing module (3) adopt coding rotary switch (5) to control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420198111.3U CN203848957U (en) | 2014-04-23 | 2014-04-23 | Intelligent pressure transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420198111.3U CN203848957U (en) | 2014-04-23 | 2014-04-23 | Intelligent pressure transmitter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203848957U true CN203848957U (en) | 2014-09-24 |
Family
ID=51561960
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420198111.3U Expired - Fee Related CN203848957U (en) | 2014-04-23 | 2014-04-23 | Intelligent pressure transmitter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203848957U (en) |
-
2014
- 2014-04-23 CN CN201420198111.3U patent/CN203848957U/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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140924 Termination date: 20150423 |
|
| EXPY | Termination of patent right or utility model |