CN112113678A - Real-time temperature detection method and system for measuring equipment wiring terminal based on PT100 platinum resistor - Google Patents
Real-time temperature detection method and system for measuring equipment wiring terminal based on PT100 platinum resistor Download PDFInfo
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- CN112113678A CN112113678A CN202010946995.6A CN202010946995A CN112113678A CN 112113678 A CN112113678 A CN 112113678A CN 202010946995 A CN202010946995 A CN 202010946995A CN 112113678 A CN112113678 A CN 112113678A
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- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 title claims abstract description 88
- 238000001514 detection method Methods 0.000 title claims abstract description 44
- 229910052697 platinum Inorganic materials 0.000 title claims abstract description 44
- 238000009529 body temperature measurement Methods 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 23
- 238000004364 calculation method Methods 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 4
- 238000012360 testing method Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 230000001960 triggered effect Effects 0.000 claims description 2
- 230000000087 stabilizing effect Effects 0.000 claims 1
- 238000013021 overheating Methods 0.000 abstract description 2
- 238000004590 computer program Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/18—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/18—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer
- G01K7/20—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer in a specially-adapted circuit, e.g. bridge circuit
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Abstract
The invention discloses a temperature detection method of a metering equipment wiring terminal based on a PT100 platinum resistor, which is applied to a control unit of the metering equipment, wherein the control unit is electrically connected with the temperature detection unit, the temperature detection unit comprises a temperature detection circuit and a temperature sensor, the temperature sensor uses a thermal resistor as a measuring element, the thermal resistor is pressed on the wiring terminal of the metering equipment through a screw after being packaged, and two ends of the thermal resistor are electrically connected with the temperature detection circuit through a lead; the temperature detection circuit converts the resistance value of the thermal resistor into a voltage signal, the voltage signal is accessed to the control unit, and the control unit carries out data processing on the voltage signal to obtain a temperature measurement value. The temperature detection method can realize the heating fault detection of the wiring terminal caused by looseness, effectively reduce the fire risk caused by overheating of the terminal and improve the safety of the metering equipment.
Description
Technical Field
The invention relates to the technical field of risk protection of metering equipment, in particular to a real-time temperature detection method for a wiring terminal of the metering equipment based on a PT100 platinum resistor. A system is also described.
Background
In the operation process of the metering equipment, a plurality of wiring terminals are burnt out, and the common reason is that the screws of the wiring terminals are loosened due to human or other factors when the metering equipment is installed on site, the contact resistance is increased, and the terminals generate heat when the heavy load current causes the electric meter to be burnt out. Nowadays, metering equipment is numerous in quantity and high in cost, and damage of the metering equipment not only influences normal electricity utilization of users, but also brings economic loss to power supply companies. Since the field installation quality is difficult to be guaranteed by management means, if the problems are solved, the field installation quality needs to be realized by technology.
The temperature of the wiring terminal rises abnormally before the metering equipment is burnt out, if a temperature detection method can be adopted, the temperature of the wiring terminal is detected in real time, and when the temperature exceeds a certain value, protective measures are taken, so that powerful guarantee can be provided for safe and stable operation of the metering equipment.
Disclosure of Invention
In view of this, the present invention provides a PT100 platinum resistor-based method for detecting a temperature of a terminal of a metering device, which can implement real-time temperature measurement of the metering device and provide a strong guarantee for safe and stable operation of the metering device.
The purpose of the invention is realized by the following technical scheme:
the real-time temperature detection method for the terminal of the metering equipment based on the PT100 platinum resistor comprises the following steps
A. Establishing a resistance value-temperature corresponding database: comprises that
Step S1, the wiring terminal of the metering equipment is put in a proper state, a set current is introduced into the metering equipment, the temperature of the wiring terminal reaches a set temperature after a period of time, and the wiring terminal is heated abnormally by the method;
step S2: the method comprises the following steps that a PT100 platinum resistor is used as a temperature sensing part of a temperature sensor, a measuring bridge is formed by electric elements including the PT100 platinum resistor and a 100 omega precision resistor, a 4.096V reference power supply Vcc is applied to the measuring bridge, when the resistance values of the PT100 platinum resistor and the 100 omega precision resistor are not equal, the bridge outputs a mV-level differential pressure signal delta V, the differential pressure signal amplified by an operational amplifier circuit is subjected to AD conversion, and then the differential pressure signal is converted into a resistance value;
step S3: the resistance value and the set temperature value are in one-to-one correspondence, and through repeated tests, a data column corresponding to the resistance value and the temperature is formed and stored in a database;
B. and (4) measuring in real time, heating the terminal of the metering equipment after the current is introduced, measuring the current resistance value in the step S2, and calling a resistance value-temperature corresponding database to obtain the temperature corresponding to the resistance value.
In particular, in step B, when there is an excess temperature, an excess temperature protection measure is triggered.
Specifically, the temperature coefficient of the PT100 platinum resistor is 0.385 Ω/deg.c, the resistance value at 0 deg.c is 100 Ω, the resistance and the temperature are in a linear relationship, and the calculation formula is: resistance value (unit Ω) ═ temperature value (unit ℃) x 0.385+ 100; .
In particular, the measuring bridge comprises two 2000 Ω resistors, a 100 Ω precision resistor and a PT100 PT resistor.
In particular, the reference power supply Vcc is regulated by a precision voltage regulator and a potentiometer.
The second aspect of the invention is realized by the following technical scheme:
the temperature detection system of the wiring terminal of the metering equipment based on the PT100 platinum resistor comprises
The temperature detection unit comprises a temperature sensor and a temperature detection circuit, wherein a temperature sensing element of the temperature sensor adopts a PT100 platinum resistor, and the platinum resistor is electrically connected with the temperature detection circuit through a lead;
the control unit comprises a microprocessor and a memory, the microprocessor is electrically connected with the memory, and the temperature detection unit acquires the temperature of the wiring terminal, converts the temperature into a voltage signal and transmits the voltage signal to the control unit; the control unit converts the voltage signal into a temperature measurement.
Particularly, the temperature detection circuit comprises a bridge circuit and an operational amplifier circuit, wherein the bridge circuit comprises two equivalent resistors, a 100 omega precision resistor and a PT100 platinum resistor, a reference power supply is generated by using a precision voltage-stabilizing source and a potentiometer for regulation, the reference power supply is applied to the bridge circuit, when the resistance values of the PT100 platinum resistor and the 100 omega precision resistor are not equal, the bridge outputs a voltage difference signal with a mV level, the voltage difference signal is amplified by the operational amplifier circuit and then outputs a voltage signal with an expected size, and the voltage signal is electrically connected to a microprocessor of the control unit.
Particularly, the microprocessor comprises an ADC module, and the voltage signal amplified by the operational amplifier circuit is converted into a resistance value after being processed and converted into an A/D conversion by the ADC module.
Particularly, the temperature display device further comprises an external display unit, wherein the external display unit is in communication connection with the microprocessor, reads the resistance value and the corresponding temperature value in the microprocessor, and obtains and displays the temperature corresponding to the resistance value in an inquiry mode.
The invention has the beneficial effects that:
the temperature sensor and the binding post in close contact with each other that this application adopted can effectively measure binding post's temperature, and the circuit principle is simple, and low cost is applicable to all electric energy meters. The temperature detection method can realize the heating fault detection of the wiring terminal caused by looseness, effectively reduce the fire risk caused by overheating of the terminal and improve the safety of the metering equipment.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the present invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings, in which:
FIG. 1 is a block diagram illustrating a method for detecting the temperature of a terminal of a metering device according to the present invention.
FIG. 2 is a schematic diagram of the connection between the terminals of the metering device and the temperature sensor.
Wherein, the names of the components represented by the reference numerals are as follows: 100-a temperature detection unit; 101-a temperature sensor; 102-a temperature detection circuit; 200-a control unit; 201-a microprocessor; 202-a memory; 300-measuring equipment terminal.
Detailed Description
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the preferred embodiments are illustrative of the invention only and are not limiting upon the scope of the invention.
The invention discloses a real-time temperature detection method for a terminal of metering equipment based on a PT100 platinum resistor, which comprises the following steps:
A. establishing a resistance value-temperature corresponding database: comprises that
Step S1, loosening the screw of the wiring terminal of the metering equipment (to make the screw in a proper loosening state), introducing set current to the metering equipment, and making the temperature of the wiring terminal reach the set temperature after a period of time, so that the wiring terminal is heated abnormally by the method;
step S2: the method comprises the following steps that a PT100 platinum resistor is used as a temperature sensing part of a temperature sensor, a measuring bridge is formed by electric elements including the PT100 platinum resistor and a 100 omega precision resistor, a 4.096V reference power supply Vcc is applied to the measuring bridge, when the resistance values of the PT100 platinum resistor and the 100 omega precision resistor are not equal, the bridge outputs a mV-level differential pressure signal delta V, the differential pressure signal amplified by an operational amplifier circuit is subjected to AD conversion, and then the differential pressure signal is converted into a resistance value;
step S3: the resistance value and the set temperature value are in one-to-one correspondence, and through repeated tests, a data column corresponding to the resistance value and the temperature is formed and stored in a database;
B. and (4) measuring in real time, heating after the current is introduced into the terminal of the metering equipment, measuring the current resistance value in the step S2, obtaining the temperature corresponding to the resistance value by calling a resistance value-temperature corresponding database, and triggering an over-temperature protection measure when the temperature is over-temperature. Over-temperature protection measures include, but are not limited to, sounding an alarm, shutting off power, etc.
In the invention, the temperature coefficient of the PT100 platinum resistor is 0.385 omega/DEG C, the resistance value is 100 omega at 0 ℃, the resistance and the temperature are in a linear relation, and the calculation formula is as follows: the resistance value (unit Ω) is a temperature value (unit ℃) × 0.385+ 100.
Based on the design idea of the method, the invention also provides a temperature detection system of the measuring equipment wiring terminal based on the PT100 platinum resistor, and the system comprises
(1) A temperature detection unit: the temperature sensing device comprises a temperature sensor and a temperature detection circuit, wherein a temperature sensing element of the temperature sensor adopts a PT100 platinum resistor, and the platinum resistor is electrically connected with the temperature detection circuit through a lead;
(2) a control unit: the temperature detection unit collects the temperature of the wiring terminal, converts the temperature into a voltage signal and transmits the voltage signal to the control unit; the control unit converts the voltage signal into a temperature measurement.
As shown in fig. 1, the temperature detection system for the wiring terminal of the metering device of the present invention includes a control unit 200 and a temperature monitoring unit 100, wherein the control unit 200 includes a microprocessor 201 and a memory 202, the microprocessor 201 is connected to a temperature detection circuit 102 and the memory 202, respectively, and the temperature detection circuit 102 and a temperature sensor 101 form the temperature monitoring unit 100.
In this embodiment, the screw of the wiring terminal 300 of the metering device is loosened, 5A of current is supplied to the metering device, the temperature of the wiring terminal reaches 80 ℃ after 15 minutes, the wiring terminal 300 is heated abnormally by the method, and then the next temperature detection is performed.
The temperature sensing part of the temperature sensor uses PT100 platinum resistor, the temperature coefficient is 0.385 omega/DEG C, the resistance value is 100 omega at 0 ℃, the resistor and the temperature are in linear relation, the calculation formula is as follows: the resistance value (unit Ω) is a temperature value (unit ℃) × 0.385+ 100. For example, when the temperature of the terminal is 80 ℃, the resistance value of the platinum resistor is as follows: 80 × 0.385+100 ═ 130.8 Ω.
The temperature detection circuit 102 is composed of a bridge circuit and an operational amplifier circuit: the bridge circuit adopts two 2000 omega resistors R1 and R2 and a 100 omega precision resistor R3 and a PT100 platinum resistor Rx to form a measuring bridge, adopts a precision voltage-stabilizing source TL431 and a potentiometer to regulate and generate a 4.096V reference power supply Vcc which is applied to the bridge circuit, when the resistances of the PT100 platinum resistor and the 100 omega precision resistor are not equal, the bridge outputs a mV-level differential pressure signal delta V, and the delta V is amplified by an operational amplifier circuit and then output to an ADC module of a microprocessor of a control unit.
According to the bridge principle, the calculation formula of the differential pressure signal is as follows: Δ V ═ Vcc (R2 · RX-R3 · R1))/((R1+ R2) · (R3+ RX)). Assuming that the actually required temperature measurement range is 0 to 150 ℃, when the temperature is 150 ℃, the PT100 platinum resistance temperature Rx is 150 × 0.385+100 157.75 Ω, and the differential pressure signal calculation formula is substituted to obtain Δ V of 4.096 × (2000 × 157.75-100 × 2000)/(2000+2000)/(100+ 157.75): 0.112V, that is, when the temperature measurement range is 0 to 150 ℃, Δ V is 0 to 0.112V.
The amplification factor of the operational amplifier circuit is determined by the input voltage Vin of the ADC module in the microprocessor and the Δ V. The Vin input range is assumed to be 0-2.5V, and 2.5/0.112 is 22.32, so the amplification factor of the operational amplifier circuit cannot exceed 22.32 times.
The voltage signal amplified by the operational amplifier circuit is accessed to an ADC module for AD conversion, then is processed and converted into a resistance value through an internal program of a microprocessor, the resistance value and the corresponding temperature value are stored in the microprocessor to form a database file which can be called at any time, and the temperature corresponding to the current resistance value can be obtained through a query mode.
As a further improvement, after the temperature of the wiring terminal of the metering equipment is collected, if the temperature is too high, protective measures are taken, and if the temperature is not too high, real-time data are stored in a memory of the control unit, so that the query can be conveniently carried out in the future. The memory can be EEPROM, and the capacity is selected according to actual requirements.
As a further improvement, the system of the invention also comprises an external display unit and an external control unit, wherein the external control unit comprises a keyboard, a mouse and the like, the external display unit and the external control unit can be in communication connection with the microprocessor (for example, the external display unit and the external control unit are connected through an I/O interface), the temperature corresponding to the resistance value is obtained and displayed by reading the resistance value and the corresponding temperature value in the microprocessor and utilizing an inquiry mode, so that the operation is more intuitive, and the requirements of various occasions can be met.
It should be recognized that embodiments of the present invention can be realized and implemented by computer hardware, a combination of hardware and software, or by computer instructions stored in a non-transitory computer readable memory. The methods may be implemented in a computer program using standard programming techniques, including a non-transitory computer-readable storage medium configured with the computer program, where the storage medium so configured causes a computer to operate in a specific and predefined manner, according to the methods and figures described in the detailed description. Each program may be implemented in a high level procedural or object oriented programming language to communicate with a computer system. However, the program(s) can be implemented in assembly or machine language, if desired. In any case, the language may be a compiled or interpreted language. Furthermore, the program can be run on a programmed application specific integrated circuit for this purpose.
Further, the operations of processes described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The processes described herein (or variations and/or combinations thereof) may be performed under the control of one or more computer systems configured with executable instructions, and may be implemented as code (e.g., executable instructions, one or more computer programs, or one or more applications) collectively executed on one or more processors, by hardware, or combinations thereof. The computer program includes a plurality of instructions executable by one or more processors.
Further, the method may be implemented in any type of computing platform operatively connected to a suitable interface, including but not limited to a personal computer, mini computer, mainframe, workstation, networked or distributed computing environment, separate or integrated computer platform, or in communication with a charged particle tool or other imaging device, and the like. Aspects of the invention may be embodied in machine-readable code stored on a non-transitory storage medium or device, whether removable or integrated into a computing platform, such as a hard disk, optically read and/or write storage medium, RAM, ROM, or the like, such that it may be read by a programmable computer, which when read by the storage medium or device, is operative to configure and operate the computer to perform the procedures described herein. Further, the machine-readable code, or portions thereof, may be transmitted over a wired or wireless network. The invention described herein includes these and other different types of non-transitory computer-readable storage media when such media include instructions or programs that implement the steps described above in conjunction with a microprocessor or other data processor. The invention also includes the computer itself when programmed according to the methods and techniques described herein.
A computer program can be applied to input data to perform the functions described herein to transform the input data to generate output data that is stored to non-volatile memory. The output information may also be applied to one or more output devices, such as a display. In a preferred embodiment of the invention, the transformed data represents physical and tangible objects, including particular visual depictions of physical and tangible objects produced on a display.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (9)
1. A real-time temperature detection method for a terminal of metering equipment based on a PT100 platinum resistor is characterized by comprising the following steps: the method comprises the following steps
A. Establishing a resistance value-temperature corresponding database: comprises that
Step S1, the wiring terminal of the metering equipment is put in a proper state, a set current is introduced into the metering equipment, the temperature of the wiring terminal reaches a set temperature after a period of time, and the wiring terminal is heated abnormally by the method;
step S2: the method comprises the following steps that a PT100 platinum resistor is used as a temperature sensing part of a temperature sensor, a measuring bridge is formed by electric elements including the PT100 platinum resistor and a 100 omega precision resistor, a 4.096V reference power supply Vcc is applied to the measuring bridge, when the resistance values of the PT100 platinum resistor and the 100 omega precision resistor are not equal, the bridge outputs a mV-level differential pressure signal delta V, the differential pressure signal amplified by an operational amplifier circuit is subjected to AD conversion, and then the differential pressure signal is converted into a resistance value;
step S3: the resistance value and the set temperature value are in one-to-one correspondence, and through repeated tests, a data column corresponding to the resistance value and the temperature is formed and stored in a database;
B. and (4) measuring in real time, heating the terminal of the metering equipment after the current is introduced, measuring the current resistance value in the step S2, and calling a resistance value-temperature corresponding database to obtain the temperature corresponding to the resistance value.
2. The real-time temperature detection method for the terminal of the metering equipment based on the PT100 platinum resistor as claimed in claim 1, characterized in that: in step B, when the temperature is over-temperature, an over-temperature protection measure is triggered.
3. The real-time temperature detection method for the terminal of the metering equipment based on the PT100 platinum resistor as claimed in claim 1 or 2, characterized in that: the temperature coefficient of the PT100 platinum resistor is 0.385 omega/DEG C, the resistance value at 0 ℃ is 100 omega, the resistance and the temperature are in a linear relation, and the calculation formula is as follows: the resistance value (unit Ω) is a temperature value (unit ℃) × 0.385+ 100.
4. The method for detecting the temperature of the terminal of the metering equipment based on the PT100 platinum resistor as claimed in claim 1, wherein: the measuring bridge comprises two 2000 Ω resistors, a 100 Ω precision resistor and a PT100 PT resistor.
5. The method for detecting the temperature of the terminal of the metering equipment based on the PT100 platinum resistor as claimed in claim 1, wherein: and the reference power supply Vcc is regulated by a precise voltage-stabilizing source and a potentiometer.
6. The utility model provides a measuring equipment binding post temperature detecting system based on PT100 platinum resistance which characterized in that: the system comprises
The temperature detection unit comprises a temperature sensor and a temperature detection circuit, wherein a temperature sensing element of the temperature sensor adopts a PT100 platinum resistor, and the platinum resistor is electrically connected with the temperature detection circuit through a lead;
the control unit comprises a microprocessor and a memory, the microprocessor is electrically connected with the memory, and the temperature detection unit acquires the temperature of the wiring terminal, converts the temperature into a voltage signal and transmits the voltage signal to the control unit; the control unit converts the voltage signal into a temperature measurement.
7. The system of claim 6, wherein the system comprises: the temperature detection circuit comprises a bridge circuit and an operational amplifier circuit, wherein the bridge circuit comprises two equivalent resistors, a 100 omega precision resistor and a PT100 platinum resistor, a reference power supply is generated by using a precision voltage stabilizing source and a potentiometer for regulation, the reference power supply is applied to the bridge circuit, when the resistance values of the PT100 platinum resistor and the 100 omega precision resistor are not equal, the bridge outputs a voltage difference signal in mV level, the voltage difference signal is amplified by the operational amplifier circuit and then outputs a voltage signal with expected size, and then the voltage signal is electrically connected to a microprocessor of the control unit.
8. The PT100 platinum resistor-based metering device terminal temperature detection system of claim 6, wherein: the microprocessor comprises an ADC module, and the voltage signal amplified by the operational amplifier circuit is converted into a resistance value after being processed and converted into an A/D conversion through the ADC module.
9. The PT100 platinum resistor-based metering device terminal temperature detection system of claim 6, wherein: the temperature display device further comprises an external display unit, wherein the external display unit is in communication connection with the microprocessor, reads the resistance value and the corresponding temperature value in the microprocessor, and obtains and displays the temperature corresponding to the resistance value in a query mode.
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| CN202010946995.6A CN112113678A (en) | 2020-09-10 | 2020-09-10 | Real-time temperature detection method and system for measuring equipment wiring terminal based on PT100 platinum resistor |
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| CN202010946995.6A CN112113678A (en) | 2020-09-10 | 2020-09-10 | Real-time temperature detection method and system for measuring equipment wiring terminal based on PT100 platinum resistor |
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Application publication date: 20201222 |