CN204788708U - Accurate digital thermometer - Google Patents
Accurate digital thermometer Download PDFInfo
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- CN204788708U CN204788708U CN201520542282.8U CN201520542282U CN204788708U CN 204788708 U CN204788708 U CN 204788708U CN 201520542282 U CN201520542282 U CN 201520542282U CN 204788708 U CN204788708 U CN 204788708U
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Abstract
The utility model discloses an accurate digital thermometer, it includes host system, input module, display module, AD conversion module, analog switch and is surveyed platinum resistance and 1k standard resistance. The output of being surveyed platinum resistance and 1k standard resistance is continuous with analog switch's input, and analog switch's output links to each other with AD conversion module's input, and AD conversion module's output links to each other with host system's an input, and input module's output links to each other with another input of host system, and another output of host system links to each other with the display module, the utility model discloses it is convenient that accurate digital thermometer has the reading, and the degree of accuracy is high, and the reproducibility is good, advantages such as reliability height.
Description
Technical field
The utility model relates to a kind of temperature-detecting device, specifically a kind of precision digital thermometer.
Background technology
Along with the develop rapidly of modern information technologies and the progressively realization of the reconstruction of traditional industries, the temperature detection that can work alone and display system are applied to numerous areas, conditional electronic thermometer and standard mercury thermometer are widely used in temperature measurement industry and each industrial enterprise with temperature correlation, use amount is huge, wide market, although mercury thermometer is accurate, repdocutbility is good, but it is very frangible, potential danger is there is in mercury spilling risk to environment and health, multiple state of the U.S. and a lot of countries in Europe have all forbidden using mercury thermometer at industrial circle, China will stop production mercury ore before the year two thousand twenty comprehensively, therefore the standard mercury thermometer that domestic metering industry uses faces the situation of stopping production, traditional temperature-detecting device sensor and electric measuring instrument are separated, operation inconvenience, and old device take thermistor as temperature-sensing element (device) simultaneously, the cost of thermistor is low, but needs follow-up signal treatment circuit, and reliability is relatively poor, thermometric accuracy is low, and detection system also has certain error.
Summary of the invention
For solving the technical matters of above-mentioned existence, the utility model provides a kind of convenient reading, and accuracy is high, and repdocutbility is good, the precision digital thermometer that reliability is high.
For achieving the above object, the technical scheme that the utility model adopts is:
A kind of precision digital thermometer, it comprises main control module, load module, display module, AD conversion module, analog switch and tested platinum resistance and 1k measuring resistance, described tested platinum resistance is connected with the input end of analog switch with the output terminal of 1k measuring resistance, the output terminal of analog switch is connected with the input end of AD conversion module, the output terminal of AD conversion module is connected with main control module input end, the output terminal of load module is connected with another input end of main control module, and another output terminal of main control module is connected with display module.
This device also comprises wireless communication module and is connected with main control module, and wireless communication module can be connected with PC or mobile phone wireless.
Be provided with gravity sensing device in described display module, segment liquid crystal screen can realize screen upset, be convenient to observed data.
Principle of work of the present utility model is:
Digital thermometer adopts temperature-sensing element (device) i.e. temperature sensor (as platinum resistance, thermopair, semiconductor, thermistor etc.), the change of temperature is converted to the change of electric signal, as the change of voltage and current, the change of temperature variation and electric signal has certain relation, as linear relationship, certain curved line relation etc., this electric signal can use analog-to-digital circuit and A/D convertor circuit that simulating signal is converted to digital signal, digital signal gives the processing unit of main control module again, as single-chip microcomputer or PC etc., processing unit calculates through inner software and this digital signal and temperature is connected, become the Temperature numerical that can show, as 25.0 degrees Celsius, then display module is passed through, as LED, LCD or computer screen etc. show to be observed to people.This completes the basic temp sensing function of digital thermometer.
The beneficial effects of the utility model are:
The primary element of the utility model ultraprecise digital thermometer front end is the Pt100 of 1/5B level, measuring resistance has extremely low temperature drift characteristic and excellent long-time stability, analog switch can measure the resistance of measured resistance and measuring resistance respectively in 100mS, by the comparison of two resistances, effective like this measuring error avoiding A/D module temperature drift and long term drift characteristic to bring; Sensor is integrated with electric measuring instrument and is connected by this device, directly can demonstrate current temperature value, be easy to carry very much, and reading numerical values is accurately convenient.
Accompanying drawing explanation
Fig. 1 is the utility model structural representation.
Embodiment
Here will be described exemplary embodiment in detail, its sample table shows in the accompanying drawings.When description below relates to accompanying drawing, unless otherwise indicated, the same numbers in different accompanying drawing represents same or analogous key element.Embodiment described in following exemplary embodiment does not represent all embodiments consistent with the utility model.On the contrary, they only with as in appended claims describe in detail, the example of device that aspects more of the present utility model are consistent.
A kind of precision digital thermometer as shown in drawings, it comprises main control module 1, load module 2, display module 3, AD conversion module 4, analog switch 5 and tested platinum resistance 6 and 1k measuring resistance 7, described tested platinum resistance 6 is connected with the input end of analog switch 5 with the output terminal of 1k measuring resistance 7, the output terminal of analog switch 5 is connected with the input end of AD conversion module 4, the output terminal of AD conversion module 4 is connected with an input end of main control module 1, the output terminal of load module 2 is connected with another input end of main control module 1, another output terminal of main control module 1 is connected with display module 3.
This device also comprises wireless communication module 8 and is connected with main control module 1, and wireless communication module 8 can be connected with PC or mobile phone wireless.
Be provided with gravity sensing device in described display module 3, segment liquid crystal screen can realize screen upset, be convenient to observed data.
Be provided with A/D convertor circuit in described AD conversion module 4, arrange single-chip microcomputer in main control module 1, display module 3 is LED or LCD display, and wireless communication module 8 arranges bluetooth or wireless network card.
Advantage of the present utility model is:
(1) resolution reaches 0.001 DEG C, and accuracy reaches year change and is better than 0.02 DEG C.
(2) built-in gravity sensing, segment liquid crystal screen can realize screen upset, be convenient to observed data.
(3) built-in wireless communication module, can control measurement data in real time.
(4) temperature coefficient is better than 1ppm/ DEG C, and when environment temperature has 20 DEG C to be changed to 50 DEG C, temperature error change only has 0.01 DEG C.
Above-described the utility model embodiment, does not form the restriction to the utility model protection domain.Any do within spirit of the present utility model and principle amendment, equivalent to replace and improvement etc., all should be included within protection domain of the present utility model.
Claims (3)
1. a precision digital thermometer, it is characterized in that: it comprises main control module, load module, display module, AD conversion module, analog switch and tested platinum resistance and 1k measuring resistance, described tested platinum resistance is connected with the input end of analog switch with the output terminal of 1k measuring resistance, the output terminal of analog switch is connected with the input end of AD conversion module, the output terminal of AD conversion module is connected with main control module input end, the output terminal of load module is connected with another input end of main control module, and another output terminal of main control module is connected with display module.
2. precision digital thermometer according to claim 1, it is characterized in that: further comprising wireless communication module and is connected with main control module, and wireless communication module can be connected with PC or mobile phone wireless.
3. precision digital thermometer according to claim 1, is characterized in that: be provided with gravity sensing device in described display module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520542282.8U CN204788708U (en) | 2015-07-24 | 2015-07-24 | Accurate digital thermometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520542282.8U CN204788708U (en) | 2015-07-24 | 2015-07-24 | Accurate digital thermometer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204788708U true CN204788708U (en) | 2015-11-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520542282.8U Active CN204788708U (en) | 2015-07-24 | 2015-07-24 | Accurate digital thermometer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204788708U (en) |
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2015
- 2015-07-24 CN CN201520542282.8U patent/CN204788708U/en active Active
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |