CN203376080U - Open circuit detection system of multipath thermocouples - Google Patents
Open circuit detection system of multipath thermocouples Download PDFInfo
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- CN203376080U CN203376080U CN201320315731.6U CN201320315731U CN203376080U CN 203376080 U CN203376080 U CN 203376080U CN 201320315731 U CN201320315731 U CN 201320315731U CN 203376080 U CN203376080 U CN 203376080U
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Abstract
The utility model discloses an open circuit detection system of multipath thermocouples. The open circuit detection system comprises N paths of thermocouples. Each path of thermocouple is connected with a temperature control unit via a multipath analog switch. N is a natural number. Besides, a first voltage-dividing resistor is arranged between the multipath analog switch and the temperature control unit. One end of the first voltage-dividing resistor is connected with a power supply via a second voltage-dividing resistor, and the other end of the first voltage-dividing resistor is connected with ground of the power supply via another second voltage-dividing resistor. The open circuit detection system of the multipath thermocouples is simple in design and convenient and rapid to use, and whether an open circuit state exists in various types of thermocouples can be effectively and safely detected by the open circuit detection system of the multipath thermocouples so that production efficiency is greatly enhanced.
Description
Technical field
The utility model relates to detection and the control technology of sensing detection element, in particular is applied to the open circuit detection system of the multi-channel thermocouple of multi way temperature control.
Background technology
At industrial control field, from control mode, to distinguish, Industry Control can be divided into motion control and process control.And in process control, the parameter of major control is temperature, pressure, flow, position etc., wherein temperature is very important in process control, as the quality of temperature control system in the fields such as metallurgy, chemical industry, food, injection moulding has directly affected the quality and yield of product.And not only will consider the precision of control system in the design of temperature control system, but also to consider the safety problem of temperature control system.In temperature control system, mostly all use thermopair as the thermometric sensing element, digital displaying meter, by detecting the value of thermopair output, then is converted into numeral and shows.But in actual applications, the thermopair ratio is easier to break down, and wherein the most incident fault breaks exactly.If can not detect timely the thermopair broken string, will bring beyond thought infringement to production run.Generally use at present the detection thermopair whether to open a way and generally all also rest on the backward stage of manual detection.
Therefore, there is defect in prior art, needs to improve.
The utility model content
Technical problem to be solved in the utility model is: the open circuit detection system that a kind of multi-channel thermocouple of the input broken string of can be timely, convenient, fast, detecting effectively, safely thermopair is provided.
The technical solution of the utility model is as follows: a kind of open circuit detection system of multi-channel thermocouple, comprise that the thermopair connection of thermopair ,Ge road, N road is connected with temperature control unit by multiway analog switch, wherein, N is natural number, and, also between described multiway analog switch and described temperature control unit, the first divider resistance also is set; Described the first divider resistance one end is connected with power supply by one second divider resistance, and its other end is connected with power supply ground by another second divider resistance.
Be applied to technique scheme, in described open circuit detection system, the voltage of described power supply is direct current 5V or direct current 15V.
Be applied to each technique scheme, in described open circuit detection system, the resistance of described the first divider resistance is set at least 20K, and the resistance of described the second divider resistance is set at least 1M.
Adopt such scheme, the utility model can be detected by temperature control unit the divider resistance of thermopair input signal variation by being provided with between thermopair and temperature control unit, when the thermopair open circuit breaks, can between the both positive and negative polarity to the thermopair input, add the electric potential difference while being greater than the thermopair full scale, temperature control unit can detect the electric potential difference that this is greater than the thermopair full scale in time, temperature control unit will send alerting signal, and prompting operation person checks whether the thermopair input opens a way in time.The utility model simplicity of design, easy to use, quick and can detect effectively, safely all kinds thermopair and whether open a way, greatly improved production efficiency.
The accompanying drawing explanation
Fig. 1 is electrical block diagram of the present utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is elaborated.
As shown in Figure 1, the present embodiment provides a kind of open circuit detection system of multi-channel thermocouple, and it is by detecting the electromotive force extent between the thermopair both positive and negative polarity, judges the principle whether thermopair breaks and makes.
Thermopair has calibration number for B, R, S, N, K, E, J, T-shaped 8 kinds of thermocouple materials, and the K type thermopair of take in the present embodiment is example, and its range is 0-1000 degree, and the potential difference values that thermopair produces is about 0-40mv.
As shown in Figure 1, the open circuit detection system of multi-channel thermocouple comprises N road thermopair, and wherein N is that the thermopair connection of natural number ，Ge road is connected with temperature control unit by multiway analog switch, between described multiway analog switch and described temperature control unit, the first divider resistance R2 also is set; The first divider resistance R2 mono-end is connected with power supply by one second divider resistance R1, and the other end of the first divider resistance R2 is connected with power supply ground by another second divider resistance R3.
The first divider resistance R2, the second divider resistance R1 and the second divider resistance R3 are separately positioned on the positive and negative signal of thermopair input and circuit that temperature control unit joins, wherein, the resistance of the first divider resistance is set to 20K or more than 20K, the resistance of the second divider resistance R1 and the second divider resistance R3 all is set to 1M or more than 1M, preferably, the resistance of the first divider resistance is set to 20K, and the resistance of the second divider resistance R1 and the second divider resistance R3 is set to respectively 1M; And, by the voltage of described power supply, be direct current 5V or direct current 15V.
As shown in Figure 1, when the input signal of the thermopair in multi-channel thermocouple is normal, thermocouple signal enters temperature control unit after the circuit of multiway analog switch selection and each divider resistance, the resistance value ratio of the first divider resistance R1 is larger, its voltage signal produced does not just affect the voltage signal of normal thermopair, and being connected on power supply and power supply the second resistance R 2 and the second resistance R 3 on the ground must be more than 1M ohm.And each divider resistance dividing potential drop must, in the back that is arranged on multiway analog switch, if be placed on the front of multiway analog switch, can exert an influence to normal thermocouple signal so.
Known according to the thermocouple temperature measurement principle, the size of the size of the testing circuit input signal in a temperature control unit input signal with thermopair changes, and the partial pressure value of each divider resistance is very little on the impact of temperature input signal, can neglect and fall to disregarding.When the input signal of thermopair broken string, now, the full scale that has surpassed thermopair because of the partial pressure value of each divider resistance is inputted corresponding magnitude of voltage.Therefore, now temperature control unit display alarm because the signal detected has surpassed the full scale value.Prompting operation person checks that whether the input signal of thermopair is normal, and convenient operation person is processed system in time, has guaranteed the control performance of temperature control unit.Because the detection system in temperature control unit and the Displaying Meter that show to detect data are prior art and can have bought on market, so no longer describe in detail at this its concrete structure.
These are only preferred embodiment of the present utility model, be not limited to the utility model, all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection domain of the present utility model.
Claims (3)
1. the open circuit detection system of a multi-channel thermocouple, comprise that the thermopair connection of thermopair ,Ge road, N road is connected with temperature control unit by multiway analog switch, and wherein, N is natural number, it is characterized in that:
Also between described multiway analog switch and described temperature control unit, the first divider resistance also is set;
Described the first divider resistance one end is connected with power supply by one second divider resistance, and its other end is connected with power supply ground by another second divider resistance.
2. open circuit detection system according to claim 1, it is characterized in that: the voltage of described power supply is direct current 5V or direct current 15V.
3. open circuit detection system according to claim 1, it is characterized in that: the resistance of described the first divider resistance is set at least 20K, and the resistance of described the second divider resistance is set at least 1M.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320315731.6U CN203376080U (en) | 2013-06-04 | 2013-06-04 | Open circuit detection system of multipath thermocouples |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320315731.6U CN203376080U (en) | 2013-06-04 | 2013-06-04 | Open circuit detection system of multipath thermocouples |
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| CN203376080U true CN203376080U (en) | 2014-01-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320315731.6U Expired - Fee Related CN203376080U (en) | 2013-06-04 | 2013-06-04 | Open circuit detection system of multipath thermocouples |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109357783A (en) * | 2018-12-21 | 2019-02-19 | 广州市优仪电子科技有限公司 | Temperature sensing circuit |
| CN112433094A (en) * | 2020-09-29 | 2021-03-02 | 中国航发沈阳黎明航空发动机有限责任公司 | Quick inspection table of engine exhaust temperature thermocouple resistance |
| CN115639496A (en) * | 2022-10-18 | 2023-01-24 | 河北宝利输变电设备制造有限公司 | Intelligent power distribution cabinet state monitoring system |
-
2013
- 2013-06-04 CN CN201320315731.6U patent/CN203376080U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109357783A (en) * | 2018-12-21 | 2019-02-19 | 广州市优仪电子科技有限公司 | Temperature sensing circuit |
| CN112433094A (en) * | 2020-09-29 | 2021-03-02 | 中国航发沈阳黎明航空发动机有限责任公司 | Quick inspection table of engine exhaust temperature thermocouple resistance |
| CN115639496A (en) * | 2022-10-18 | 2023-01-24 | 河北宝利输变电设备制造有限公司 | Intelligent power distribution cabinet state monitoring system |
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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: 20140101 Termination date: 20180604 |
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| CF01 | Termination of patent right due to non-payment of annual fee |