CN210221313U - Temperature alarm system - Google Patents
Temperature alarm system Download PDFInfo
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- CN210221313U CN210221313U CN201920967312.8U CN201920967312U CN210221313U CN 210221313 U CN210221313 U CN 210221313U CN 201920967312 U CN201920967312 U CN 201920967312U CN 210221313 U CN210221313 U CN 210221313U
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- operational amplifier
- temperature alarm
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Abstract
The utility model relates to a temperature alarm equipment field, concretely relates to temperature alarm system, include the temperature alarm unit of a plurality of series connections of being connected with the controller, every temperature alarm unit includes thermopile temperature sensor and thermistor's TS318 temperature sensor, thermopile temperature sensor is connected with fortune amplifier chip AD620 input, chip LM358 inverting terminal is put with fortune to fortune amplifier chip AD620 output, thermistor is connected the back with adjustable resistance and is connected with fortune amplifier chip LM358 homophase end, chip LM358 output is put with voltage comparator input to fortune and is connected, voltage comparator output is connected with the triode base, the triode collecting electrode is connected with the relay, the normally closed contact of a set of contact of relay is connected with the positive pole of instructing emitting diode, normally open contact and the anodal connection of warning emitting diode. The utility model discloses temperature alarm system is simple reliable and stable, can adjust different alarm temperature, can work under adverse circumstances such as electromagnetic interference, can monitor the temperature of huge object.
Description
Technical Field
The utility model relates to a temperature alarm device field, concretely relates to temperature alarm system.
Background
The temperature alarm system is widely applied to industrial production. However, for some occasions, too accurate temperature alarm is not needed, and a simple, convenient, stable and reliable alarm system is hoped. However, most temperature sensors are complex to use, and some simple temperature alarms cannot flexibly adjust specific alarm temperatures, cannot be used in severe environments such as strong electromagnetic interference, and cannot measure the temperature of objects such as high-voltage cables and the like which cannot be contacted. The whole measurement of a huge object is difficult, and sometimes, the target temperature and the ambient temperature cannot be effectively distinguished, so that errors are easy to generate.
Disclosure of Invention
The to-be-solved technical problem of the utility model is how to overcome the not enough of prior art existence, provide a simple, stable, reliable temperature alarm system.
The technical scheme of the utility model is that: a temperature alarm system comprises a controller and a plurality of serially connected temperature alarm units connected with the controller, wherein each temperature alarm unit comprises a power supply and a TS318 temperature sensor, the TS318 temperature sensor comprises a thermopile temperature sensor and a thermistor, the thermopile temperature sensor is connected with the input end of an operational amplifier chip AD620, the operational amplifier chip AD620 is connected with a first adjustable resistor, the output end of the operational amplifier chip AD620 is connected with the inverting end of the operational amplifier chip LM358, the inverting end of the operational amplifier chip LM358 is grounded, the thermistor is connected with a second adjustable resistor and then connected with the same-phase end of the operational amplifier chip LM358, the output end of the operational amplifier chip LM358 is connected with the input end of a voltage comparator, the voltage comparator is further connected with a third adjustable resistor, the output end of the voltage comparator is connected with the base electrode of a triode, and the collector electrode of the triode is connected with a relay, the emitting electrode of the triode is grounded, a normally closed contact of one group of contacts of the relay is connected with the anode of the indicating light emitting diode, and a normally open contact is connected with the anode of the alarming light emitting diode; the relay also comprises another group of contacts, and the normally closed contacts of the another group of contacts of the relay of the plurality of temperature alarm units are connected in series and then connected with the controller.
Further, the voltage comparator is of an LM393 type.
The utility model designs the temperature alarm system, and each temperature alarm unit uses the TS318 temperature sensor to effectively measure the environmental temperature and the target temperature; in order to identify a millivolt voltage signal of a thermopile temperature sensor in the TS318 temperature sensor, the alarm unit adopts a high-precision operational amplifier chip AD 620; the reference voltage of the LM393 voltage comparator can be adjusted, so that the specific alarm temperature can be flexibly adjusted; the alarm system is used in severe environments such as strong electromagnetic interference, high-voltage cables, non-contact objects and the like, and the plurality of alarm units are connected in series to realize integral measurement of huge objects. The utility model discloses have potential market value.
Drawings
The present invention will be further explained with reference to the accompanying drawings.
FIG. 1 is a circuit diagram of a temperature alarm unit of the present invention;
fig. 2 is a schematic view of a plurality of temperature alarm units connected in series.
Detailed Description
The following describes a temperature alarm system according to the present invention in detail with reference to the accompanying drawings and examples.
As shown in fig. 1 and 2, a temperature alarm system comprises a controller i and a plurality of temperature alarm units connected in series with the controller i, each temperature alarm unit comprises a power supply P and a TS318 temperature sensor, the TS318 temperature sensor comprises a thermopile temperature sensor ii and a thermistor iii, pins 1 and 3 of the thermopile temperature sensor ii are respectively connected with pins 3 and 2 of an operational amplifier chip AD620, pins 1 and 8 of the operational amplifier chip AD620 are connected with pins 1 and 2 of an adjustable resistor Rp1, pin 6 of the operational amplifier chip AD620 is connected with an inverting terminal of the operational amplifier chip LM358, pins 7 and 4 of the operational amplifier chip AD620 are respectively connected with a power supply P +5 volt terminal and a-5 volt terminal, a pin 5 is grounded, and the inverting terminal of the operational amplifier chip LM358 is further connected with a resistor and then grounded.
The front end of the thermistor III is connected with a power supply P + 5V end, the rear end of the thermistor III is connected with a 1 end of an adjustable resistor Rp2, a 2 end of the adjustable resistor Rp2 is connected with a same-phase end of the operational amplifier chip LM358, a 3 end of the adjustable resistor Rp2 is grounded, an output end of the operational amplifier chip LM358 is connected with a 3 pin of a voltage comparator, the voltage comparator is of an LM393 type, an 8 pin of the voltage comparator is connected with a power supply P + 5V end, pins 4, 5, 6 and 7 are grounded, a 2 pin is connected with a 2 end of the adjustable resistor Rp3, a 1 end of the adjustable resistor Rp3 is connected with a power supply P + 5V end and a 3 end is grounded, a 1 pin of the voltage comparator is connected with a base of a triode Q1, a base of the triode Q1 is further connected with the power supply P + 5V end after being connected with a resistor in series, a collector of the triode Q1 is connected with an 8 pin of a relay K, an emitter of the triode Q1, and pins 4 of normally closed contacts of a group of contacts of the relay K are connected with a power supply P +5 volt end, pins 5 are connected with the anode of an indicating light-emitting diode D1, pins 6 of normally open contacts are connected with the anode of an alarming light-emitting diode D2, and the cathode of the indicating light-emitting diode D1 and the cathode of an alarming light-emitting diode D2 are grounded. For clarity of the circuit diagram, the connection lines between the power source P and the electric components are not shown.
As shown in fig. 2, the relay K further includes another group of contacts, the another group of contacts includes pins 1 and 2 of normally closed contacts and pins 3 of normally open contacts, and the pins 1 and 2 of the another group of contacts of the relay K of the plurality of temperature alarm units are connected in series and then connected with the controller i.
The utility model discloses when using, the infrared ray that II detection object of thermopile temperature sensor sent produces a linear relevant voltage signal with it according to the temperature of object simultaneously, and voltage signal is the millivolt rank, adopts the fortune of high accuracy to put chip AD620 and handles, and chip AD620 is put to fortune utilizes voltage regulating resistor Rp1 to amplify after the signal conveying to fortune and puts chip LM358, and chip LM358 is put with voltage signal transmission to fortune to thermistor III simultaneously.
The two voltage signals are subtracted in a subtracter formed by an operational amplifier chip LM 358. The calculation formula is as follows:
T＝T1-kT2
wherein T is the actual temperature, T1 is the temperature obtained by the thermopile sensor II, T2 is the environment temperature measured by the thermistor III, and k is the proportionality coefficient of the thermistor III, and the correction can be carried out according to the measured distance. And then inputting the actual temperature signal into a voltage comparator LM393, comparing the actual temperature signal with a reference voltage, adjusting the reference voltage by Rp3, if the actual temperature signal is higher than the reference voltage, outputting a high level by the voltage comparator LM393, conducting a triode Q1, actuating a relay K, closing pins 4 and 6, and lighting an alarm light-emitting diode D2 to give an alarm.
Pins of normally closed contacts 1 and 2 of the other group of contacts of each relay K of the plurality of temperature alarm units are connected in series, so that signal wires can also be connected in series to be connected with the controller I. When the whole system works, any one temperature alarm unit alarms, the pins of the normally closed contacts 1 and 2 are disconnected, the controller I can detect the disconnection, but the alarm light-emitting diode D2 only displays the position where a dangerous case occurs, and the search is convenient. The controller I can select an upper computer such as a PLC.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.
Claims (2)
1. A temperature alarm system, includes controller and a plurality of temperature alarm units of establishing ties that are connected with the controller, its characterized in that: each temperature alarm unit comprises a power supply and a TS318 temperature sensor, the TS318 temperature sensor comprises a thermopile temperature sensor and a thermistor, the thermopile temperature sensor is connected with the input end of an operational amplifier chip AD620, the operational amplifier chip AD620 is connected with a first adjustable resistor, the output end of the operational amplifier chip AD620 is connected with the inverting end of the operational amplifier chip LM358, the inverting end of the operational amplifier chip LM358 is grounded, the thermistor is connected with a second adjustable resistor and then connected with the inverting end of the operational amplifier chip LM358, the output end of the operational amplifier chip LM358 is connected with the input end of a voltage comparator, the voltage comparator is further connected with a third adjustable resistor, the output end of the voltage comparator is connected with a triode base electrode, a triode collector electrode is connected with a relay, a triode emitter electrode is grounded, and the normally closed contact of a group of contacts of the relay is connected with the anode of an indicating light emitting diode, the normally open contact is connected with the anode of the alarm light-emitting diode; the relay also comprises another group of contacts, and the normally closed contacts of the another group of contacts of the relay of the plurality of temperature alarm units are connected in series and then connected with the controller.
2. A temperature alarm system according to claim 1, wherein: the voltage comparator is of the LM393 type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920967312.8U CN210221313U (en) | 2019-06-26 | 2019-06-26 | Temperature alarm system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920967312.8U CN210221313U (en) | 2019-06-26 | 2019-06-26 | Temperature alarm system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210221313U true CN210221313U (en) | 2020-03-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920967312.8U Active CN210221313U (en) | 2019-06-26 | 2019-06-26 | Temperature alarm system |
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| Country | Link |
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| CN (1) | CN210221313U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114876905A (en) * | 2022-04-18 | 2022-08-09 | 珠海趣印科技有限公司 | Cylinder alarm method based on PLC |
-
2019
- 2019-06-26 CN CN201920967312.8U patent/CN210221313U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114876905A (en) * | 2022-04-18 | 2022-08-09 | 珠海趣印科技有限公司 | Cylinder alarm method based on PLC |
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