CN2099308U - Multiple point temp. round measuring system with grounding inspection device - Google Patents
Multiple point temp. round measuring system with grounding inspection device Download PDFInfo
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- CN2099308U CN2099308U CN 91210945 CN91210945U CN2099308U CN 2099308 U CN2099308 U CN 2099308U CN 91210945 CN91210945 CN 91210945 CN 91210945 U CN91210945 U CN 91210945U CN 2099308 U CN2099308 U CN 2099308U
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- resistance
- analog switch
- thermopair
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- control transformation
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Abstract
The utility model discloses a multiple point temperature round measuring system with a grounding inspection device and comprises an analog switching control conversion circuit and a relay control conversion circuit. The multiple point temperature round measuring system with a grounding inspection device has the advantages of an analog switch: the reliability is high, the response is quick, the service life is long, the volume is small, and the price is low. The multiple point temperature round measuring system with a grounding inspection device discards the disadvantages of the analog switch: when a thermocouple which is connected with the analog switch contacts the ground with multiple points, a direct current output signal which controls the conversion can be probably influenced. When the thermocouple of the utility model contacts the ground, a grounding inspection circuit can inspect the situation, the thermocouple of the circuit is converted onto the relay control conversion circuit. The utility model has the advantages of the two control conversion circuits and solves a series of disadvantages which are caused because the conversion is controlled only by the relay, for example, the cost is high, the response is slow, the service life is short, the volume is large, etc. The multiple point temperature round measuring system of the utility model has the advantages of high reliability, low cost, etc. The phenomenon that the reading number of the temperature of the thermocouple jumps and the reading number is wrong can be eliminated.
Description
Multi-point temp logging described in the utility model belongs to the temperature survey field, especially is suitable for thermocouple temperature measurement and the more abominable place of industrial environment.
In the prior art, the temperature polling instrument of useful single simulation switch control transformation, its advantage is the reliability height, and response speed is fast, and the life-span is long, and volume is little, and price is low.But often because of vibrating in the industrial environment, the influence of factors such as burn into humidity might ground connection after use a period of time for the signal-thermopair of analog switch control transformation.If be installed in the thermopair while ground connection on the different process device, owing to the existence of spuious electric current between device, influence the ac potential difference of device earth point, promptly have one to exchange interference voltage.Some voltage effective values of disturbing are greater than analog switch direct supply voltage, then the dc voltage value of just exporting at the passage of gating is had very big influence, interchannel interchange interference voltage can influence the direct-flow output signal of analog switch control transformation, thereby make the temperature reading distortion of ground connection thermopair or beat, thereby influence correct temperature survey or operation brings fault to production.At present external collective and distributive type control system adopts magnetic coupling to the collection of small-signal (as thermocouple signal) more, and the photoelectricity coupling scheme influence of small-signal multipoint earthing to analog switch separated, but price are too high, are equivalent to tens times of this device price.At present abroad exchange the influence of interference voltage to reading with the temperature polling instrument of the single relay control transformation of domestic usefulness can overcome that the thermopair multipoint earthing caused, its anti-interchange interference voltage is 250VAC, but relay is compared the cost height with the simulation switch, poor reliability, response speed is slow, volume is big, and the life-span is short.
The purpose of this utility model provides a kind of multi-point temp logging that the analog switch control transformation is combined with the relay control transformation and be partly with ground detection device in the analog switch control transformation.
Earth-free thermopair can be all or part of by analog switch plate 20 control transformation (as Fig. 1) in the whole multi-channel thermocouple signal, and all the other ground connection with earth-free thermopair by relay control transformation plate 19 control transformation.Detected path thermocouple signal switches the thermopair electromotive force of the selected passage in back behind the hardware filtering circuit by relay control transformation plate 19 or analog switch control transformation plate 20, amplify through amplifier plate 23 again, send logging motherboard 21 to carry out data processing and switching controls, demonstration then, and carry out man-machine conversation etc. by keyboard.The used direct supply of complete machine each several part is supplied with by power panel 22.
The utility model is to realize like this, all temperature thermocouples are divided into the thermopair and the earth-free thermopair of ground connection, earth-free then thermopair can all or part ofly be received on the circuit by the analog switch control transformation, ground connection and remainingly do not have the thermopair of ground connection to be connected on the circuit of relay control transformation.Be connected on the earth-free thermopair on the analog switch control transformation circuit, in case ground connection, can detect by grounded inspection circuit, detect the back and show this paths number and send warning, inform the maintenance personal this road thermopair reconfiguration on the circuit of relay control transformation.
Describe technical solution of the present utility model in detail below in conjunction with accompanying drawing, multi-point temp logging described in the utility model (as Fig. 2) includes relay control transformation plate 19, analog switch control transformation plate 20, motherboard 21, power panel 22, amplifier plate 23, shell 24, channel number display 25, four megadyne temperature degree displays 26, external keyboard 27, inner keyboard 28 compositions such as grade, include A/D converter 29 on the motherboard 21, single-chip microcomputer 30, display interface 31, keyboard interface 32, parallel interface 33, nixie display 34 and inside and outside keyboard 35.Grounded inspection circuit is equipped with in amplifier plate 23 importations, circuit relay electrical equipment contact 17 1 termination enclosure earth points, the other end is received between resistance 15 and 5 through level pressure source 16, analog switch 3 one ends link to each other with thermopair 18 by resistance 1, and the other end links to each other with amp.in with 13 by resistance 5.
When the analog switch control transformation, make relay tip 17 closures (connection) by software control, when the thermopair of analog switch control transformation is earth-free, this grounded inspection circuit does not form path, the level pressure source can not be at resistance 5, produce additional signal voltage on 1, so what send into amplifier only is the thermocouple electromotive force of detected passage demonstrates this passage after the motherboard conversion process normal temperature value.In case thermopair ground connection (as shown in phantom in Figure 3) then the signal that is added to amp.in is together delivered to amplifier input terminal because of grounded inspection circuit has now formed path level pressure source at the auxiliary voltage that produces on the resistance 1,5 also superposition again on the thermopair electromotive force except that the thermopair electromotive force.The auxiliary voltage that the level pressure source was produced on resistance 1,5 when grounded inspection circuit became path is:
(level pressure source electromotive force) * (resistance 1+ resistance 5)/(resistance 1+ resistance 5+ resistance 15)
This is worth the thermopair upper limit potential value greater than 2 times.
When this voltage during greater than 2 times of thermopair upper limit potential values if during in the analog switch control transformation this path thermocouple one ground connection will produce together send on this auxiliary voltage and the signal of superposition at thermopair amplifier make amplifier output voltage surpass higher limit and make main frame produce the overload alarm signal with advise the maintenance personal this passage reconfiguration on the circuit of relay control transformation.And when the relay control transformation since this moment relay tip 17 open both made thermopair ground connection grounded inspection circuit do not become path yet, can not report to the police so can not produce auxiliary voltage yet.
The selected relay of relay control transformation plate should be stable performance, and the life-span is long, and volume is little, should concentrate on them on the plate,, detects maintenance so that change at any time.
The multi-point temp logging that has ground detection device described in the utility model has the reliability height, and cost is low, significantly reduce and eliminate the electric thermo-couple temperature distortion in readings, characteristics such as beat.
Description of drawings:
Fig. 1 is the multi-point temp logging theory diagram that has ground detection device;
Fig. 2 is complete machine is extracted a part out from cabinet a structural representation;
Fig. 3 is the grounded inspection circuit schematic diagram.
Among the figure, the inside and outside keyboard of 1-resistance 2-resistance 3-analog switch 4-analog switch 5-resistance 6-resistance 7-electric capacity 8-electric capacity 9-electric capacity 10-electric capacity 11-electric capacity 12-electric capacity 13-resistance 14-resistance 15-resistance 16-level pressure source 17-relay tip 18-thermocouple 19-Control change-over panel 20-analog switch control change-over panel 21-motherboard 22-power panel 23-amplifier plate 24-shell 25-channel number display 26-four megadyne temperature degree display 27-external keyboard 28-inner keyboard 29-A/D converter 30-single-chip microcomputer 31-display interface 32-keyboard interface 33-parallel interface 34-nixie display 35-
Claims (3)
1, a kind of multi-point temp logging that has ground detection device includes relay control transformation plate 19, analog switch control transformation plate 20, motherboard 21, power panel 22, amplifier plate 23, shell 24, channel number display 25, four megadyne temperature degree displays 26, external keyboard 27, inner keyboard 28 compositions such as grade, grounded inspection circuit is equipped with in the importation that it is characterized in that amplifier plate 23, circuit relay electrical equipment contact 17 1 termination enclosure earth points, and the other end is received between resistance 5 and 15 through level pressure source 16, analog switch 3 one ends link to each other with thermopair 18 by resistance 1, and the other end links to each other with amp.in with 13 by resistance 5.
In case 2, it is characterized in that thermopair ground connection when the analog switch control transformation according to the described multi-point temp logging of claim 1, grounded inspection circuit produces auxiliary voltage and equals:
(level pressure source electromotive force) * (resistance 1+ resistance 5)/(resistance 1+ resistance 5+ resistance 15)
Should be higher than 2 times of thermopair upper limit potential value.
3, it is characterized in that according to the described multi-point temp logging of claim 1 earth-free thermopair can all or part ofly receive on the circuit by the analog switch control transformation, ground connection and remainingly do not have the thermopair of ground connection to be connected on the circuit of relay control transformation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91210945 CN2099308U (en) | 1991-07-26 | 1991-07-26 | Multiple point temp. round measuring system with grounding inspection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91210945 CN2099308U (en) | 1991-07-26 | 1991-07-26 | Multiple point temp. round measuring system with grounding inspection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2099308U true CN2099308U (en) | 1992-03-18 |
Family
ID=4919689
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91210945 Withdrawn CN2099308U (en) | 1991-07-26 | 1991-07-26 | Multiple point temp. round measuring system with grounding inspection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2099308U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100402997C (en) * | 2006-08-10 | 2008-07-16 | 中华人民共和国天津出入境检验检疫局 | Detection system of fuel gas burner safety use environment temperature |
| CN107820564A (en) * | 2015-05-01 | 2018-03-20 | 沃特洛电气制造公司 | Active ground connection thermocouple and operating method |
| CN110057461A (en) * | 2019-04-08 | 2019-07-26 | 上海工程技术大学 | A kind of electric thermo-couple temperature collection system |
| CN113465758A (en) * | 2021-06-21 | 2021-10-01 | 中国原子能科学研究院 | Temperature measuring device and temperature measuring system |
-
1991
- 1991-07-26 CN CN 91210945 patent/CN2099308U/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100402997C (en) * | 2006-08-10 | 2008-07-16 | 中华人民共和国天津出入境检验检疫局 | Detection system of fuel gas burner safety use environment temperature |
| CN107820564A (en) * | 2015-05-01 | 2018-03-20 | 沃特洛电气制造公司 | Active ground connection thermocouple and operating method |
| CN107820564B (en) * | 2015-05-01 | 2019-12-13 | 沃特洛电气制造公司 | Active grounding thermocouple and operation method |
| CN110057461A (en) * | 2019-04-08 | 2019-07-26 | 上海工程技术大学 | A kind of electric thermo-couple temperature collection system |
| CN113465758A (en) * | 2021-06-21 | 2021-10-01 | 中国原子能科学研究院 | Temperature measuring device and temperature measuring system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |