CN103454003A - Pointer type electronic thermometer - Google Patents
Pointer type electronic thermometer Download PDFInfo
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- CN103454003A CN103454003A CN2013103863770A CN201310386377A CN103454003A CN 103454003 A CN103454003 A CN 103454003A CN 2013103863770 A CN2013103863770 A CN 2013103863770A CN 201310386377 A CN201310386377 A CN 201310386377A CN 103454003 A CN103454003 A CN 103454003A
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Abstract
The invention provides a pointer type electronic thermometer. The pointer type electronic thermometer is characterized by comprising a 9V direct-current power supply, a filter circuit, a temperature detecting and temperature and voltage conversion circuit and a temperature indicating circuit. An LM35 centigrade temperature sensor IC1 is selected in the temperature detecting and temperature and voltage conversion circuit. In the temperature indicating circuit, the voltage output end Vout of the centigrade temperature sensor IC1 is connected with the positive electrode of the meter head V of a voltmeter through a resistor R1, and the negative electrode of the meter head V of the voltmeter is connected with the circuit GND. Based on the principle that the linear output voltage of the centigrade temperature sensor is in direct proportion to centigrade temperature and the performance index of the centigrade temperature sensor, the pointer type electronic thermometer is designed and manufactured. After being used, the pointer type electronic thermometer has the advantages of being wide in temperature measurement covering range, clear in temperature indicating, capable of measuring the local temperature of a certain point, faster in response than a mercurial thermometer and the like.
Description
Technical field
The invention belongs to temperature survey and electronic technology field, is about a kind of pointer electron thermometer.
Background technology
Often need to carry out temperature survey in producing and living, the method for measuring temperature is a variety of, along with the development of integrated circuit technique, developed and can easily temperature transition have been become to the integrated circuit of electric signal, and the Celsius temperature sensor is functional.That the present invention selects is Celsius temperature sensor LM35, and it is a plastic packaging three-terminal element, and its linear output voltage is directly proportional to Celsius temperature, that is: the every rising of temperature is 1 ℃, and output voltage just increases 10mV.
According to the principle of Celsius temperature sensor and its performance index, the present invention has designed and produced described pointer electron thermometer.Through using, the pointer electron thermometer has the local temperature that the temperature survey coverage is wide, the temperature indication is clear, can measure certain point, and than advantages such as the mercury thermometer reaction are quick.
Below describe pointer electron thermometer of the present invention related correlation technique in implementation process in detail.
Summary of the invention
Goal of the invention and beneficial effect: that the present invention selects is Celsius temperature sensor LM35, and it is a plastic packaging three-terminal element, and its linear output voltage is directly proportional to Celsius temperature, that is: the every rising of temperature is 1 ℃, and output voltage just increases 10mV.According to the principle of Celsius temperature sensor and its performance index, designed and produced described pointer electron thermometer.Through use the pointer electron thermometer to there is the local temperature that the temperature survey coverage is wide, the temperature indication is clear, can measure certain point, and than advantages such as the mercury thermometer reaction are quick.
The circuit working principle: that the present invention uses is Celsius temperature sensor LM35, and it is the three-terminal element of a plastic packaging, and its output voltage is directly proportional to temperature, 1 ℃ of the every rising of temperature, and output voltage increases 10mV.
The Celsius temperature sensor can change into the height of temperature the height of voltage, utilizes the voltage table gauge outfit to carry out indicated temperature.Around this principle, select the voltage table gauge outfit to carry out the height of indicated temperature.Current value during embodiment process test voltage table meter pointer full scale is 95 μ A, and at this moment the voltage at voltage table gauge outfit two ends is 0.09V, and the internal resistance that calculates the voltage table gauge outfit according to Ohm law is 947 Ω.
Technical characterictic: the pointer electron thermometer, it comprises 9V direct supply and filtering circuit, temperature detection and temperature and voltage conversion circuit, temperature indicator circuit, it is characterized in that:
Temperature detection and temperature and voltage conversion circuit: the model that Celsius temperature sensor IC 1 is selected is LM35, the anodal VCC of the feeder ear Vs connection circuit of Celsius temperature sensor IC 1, the voltage output end Vout jointing temp indicating circuit of Celsius temperature sensor IC 1, the earth terminal connection circuit ground GND of Celsius temperature sensor IC 1;
Temperature indicator circuit: the voltage output end Vout of Celsius temperature sensor IC 1 connects the positive pole of voltage table gauge outfit V by resistance R 1, the negative pole connection circuit ground GND of voltage table gauge outfit V;
9V direct supply and filtering circuit: the 9V DC power anode is connected with the positive pole of circuit anode VCC, electrochemical capacitor C1 and an end of capacitor C 2, and the 9V DC power cathode is connected with the negative pole of circuit ground GND, electrochemical capacitor C1 and the other end of capacitor C 2.
The accompanying drawing explanation
Accompanying drawing is embodiment circuit working schematic diagram of pointer electron thermometer provided by the invention.
Embodiment
According to pointer electron thermometer circuit working schematic diagram shown in the drawings and accompanying drawing explanation, and according to annexation between components and parts in the described each several part circuit of summary of the invention, and the components and parts technical parameter described in embodiment requires and the circuit production main points are implemented to realize the present invention, below in conjunction with embodiment, correlation technique of the present invention is further described.
The selection of components and parts and technical parameter thereof
IC1 is the Celsius temperature sensor, and its linear output voltage is directly proportional to Celsius temperature, that is: the every rising of temperature is 1 ℃, and output voltage increases 10mV, can select the product of U.S. NS company, and its model is LM35, and it is three-terminal element, plastic packaging form TO-92;
Select voltage table gauge outfit maximum voltage can only measure 0.09V, namely can only indicate 9 ℃ of following temperature, so, must connect a suitable resistance and increase temperature measurement range.According to the relation of Ohm law voltage and electric current, the resistance of 1 3.9K Ω of resistance R 1 use increases temperature measurement range;
C1 is electrochemical capacitor, and its capacity is 470 μ F/16V; C2 is electric capacity, and its capacity is 0.01 μ F;
The supply voltage of Celsius temperature sensor IC 1 is 4～30V, and the direct supply of embodiment is selected 1 joint 9V laminated cell, and its model is 6F22.
Make main points and circuit debugging
The making of temperature scale dish: the original dial reading of voltage table gauge outfit is magnitude of voltage, and voltage readings also needs to convert becomes temperature value, very not directly perceived.For this reason, the index dial of voltage table gauge outfit is pulled down to (gauge outfit is a precise part, wants careful during dismounting), be loaded on conversely.For accurate indicated temperature, the scale position mark of pointer electron thermometer when not powering is 0 ℃, then uses mercury thermometer calibration second point, as: when mercury thermometer is designated as 30 ℃, by the pointer indicating position mark 30 ℃.With compasses, protractor, accurately the index dial between 0 to 30 is divided into to 30 lattice on index dial, every lattice are 1 ℃.Attention: if temperature measurement range comprises 100 ℃, can be with the boiling boiling water as the 3rd gauge point of temperature correction, and the 3rd gauge point should extremely approach voltage table gauge outfit full scale, to reduce the reading error of index dial as far as possible.
According to circuit working schematic diagram shown in the drawings, welding correctness and the welding quality of whole components and parts in check circuit.Generally need only element quality intact, and the circuit welding is errorless, the pointer electron thermometer connects voltmeter head and the 9V direct supply can work.
Through pointer electron thermometer and mercury thermometer contrast, two kinds of thermometer measure temperature phase differences are less than 0.5 ℃.
The temperature measurement range of pointer electron thermometer is: 0 ℃～+ 100 ℃.
Claims (1)
1. a pointer electron thermometer, it comprises 9V direct supply and filtering circuit, temperature detection and temperature and voltage conversion circuit, temperature indicator circuit, it is characterized in that:
The model that Celsius temperature sensor IC 1 in described temperature detection and temperature and voltage conversion circuit is selected is LM35, the anodal VCC of the feeder ear Vs connection circuit of Celsius temperature sensor IC 1, the voltage output end Vout jointing temp indicating circuit of Celsius temperature sensor IC 1, the earth terminal connection circuit ground GND of Celsius temperature sensor IC 1;
In described temperature indicator circuit, the voltage output end Vout of Celsius temperature sensor IC 1 connects the positive pole of voltage table gauge outfit V by resistance R 1, the negative pole connection circuit ground GND of voltage table gauge outfit V;
In described 9V direct supply and filtering circuit, the 9V DC power anode is connected with the positive pole of circuit anode VCC, electrochemical capacitor C1 and an end of capacitor C 2, and the 9V DC power cathode is connected with the negative pole of circuit ground GND, electrochemical capacitor C1 and the other end of capacitor C 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013103863770A CN103454003A (en) | 2013-08-29 | 2013-08-29 | Pointer type electronic thermometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013103863770A CN103454003A (en) | 2013-08-29 | 2013-08-29 | Pointer type electronic thermometer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103454003A true CN103454003A (en) | 2013-12-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013103863770A Pending CN103454003A (en) | 2013-08-29 | 2013-08-29 | Pointer type electronic thermometer |
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| CN (1) | CN103454003A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108627281A (en) * | 2017-03-22 | 2018-10-09 | 佛山市顺德区美的电热电器制造有限公司 | A kind of household electrical appliance thermometric calibration method and thermometric calibrating installation |
| CN111089663A (en) * | 2020-01-04 | 2020-05-01 | 辽宁科技大学 | Mercury thermometer correction method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5208162A (en) * | 1990-05-08 | 1993-05-04 | Purafil, Inc. | Method and apparatus for monitoring corrosion |
| CN2328993Y (en) * | 1998-02-26 | 1999-07-14 | 宋珊珊 | thermometer |
| CN203396501U (en) * | 2013-08-29 | 2014-01-15 | 何林 | Pointer type electronic thermometer |
-
2013
- 2013-08-29 CN CN2013103863770A patent/CN103454003A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5208162A (en) * | 1990-05-08 | 1993-05-04 | Purafil, Inc. | Method and apparatus for monitoring corrosion |
| CN2328993Y (en) * | 1998-02-26 | 1999-07-14 | 宋珊珊 | thermometer |
| CN203396501U (en) * | 2013-08-29 | 2014-01-15 | 何林 | Pointer type electronic thermometer |
Non-Patent Citations (1)
| Title |
|---|
| 刘一明: "用4个元件制作的电子指针式温度计", 《电子制作》, 31 December 2007 (2007-12-31), pages 5 - 6 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108627281A (en) * | 2017-03-22 | 2018-10-09 | 佛山市顺德区美的电热电器制造有限公司 | A kind of household electrical appliance thermometric calibration method and thermometric calibrating installation |
| CN111089663A (en) * | 2020-01-04 | 2020-05-01 | 辽宁科技大学 | Mercury thermometer correction method |
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Application publication date: 20131218 |