CN219589847U - Temperature coefficient of resistance calibration system - Google Patents
Temperature coefficient of resistance calibration system Download PDFInfo
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- CN219589847U CN219589847U CN202320069768.9U CN202320069768U CN219589847U CN 219589847 U CN219589847 U CN 219589847U CN 202320069768 U CN202320069768 U CN 202320069768U CN 219589847 U CN219589847 U CN 219589847U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The utility model provides a temperature coefficient of resistance calibration system, which comprises a calibrated unit, a standard unit, a PC and a precise constant temperature tank, wherein a calibrated resistor-temperature sensor and a standard platinum resistor are placed and respectively connected with a corresponding universal meter and a corresponding thermometer through junction boxes, and signal output ends of the universal meter and the thermometer are respectively connected with the PC to record the relationship between the resistor and the temperature. The system provided by the utility model has a simple structure, can realize automatic detection and coefficient calibration, and is convenient and practical.
Description
Technical Field
The utility model relates to the field of metering and calibrating devices, in particular to a temperature coefficient of resistance calibration system for a nonstandard resistance-temperature sensor.
Background
The thermal conductivity of the material is measured by a transient method based on a Fourier three-dimensional transient heat transfer theory, and the thermal conductivity of the material is measured by a transient method, such as a transient hot wire method, a transient tropical method, a transient plane heat source method, a transient heat bridge method and the like, by using resistance wires and strips as heating elements and by designing a processed resistance-temperature sensor through a special structure, constant current or power is loaded on the sensor, and based on the established simplified one-dimensional heat transfer model, the thermal conductivity of the material can be obtained according to an analysis model by measuring the temperature change or voltage change conditions at two ends of the sensor. However, since the resistance wires or strips used by different sensors are different, accurate measurement and calibration of the temperature coefficient of resistance are required to be used for analytical calculation of the heat conductivity coefficient.
At present, no system for measuring or calibrating the resistance temperature coefficient of the nonstandard resistance-temperature sensor is specially used for measuring or calibrating the resistance temperature coefficient of the nonstandard resistance-temperature sensor according to GB/T6148-2005 'precision resistance alloy resistance temperature coefficient test method'.
Disclosure of Invention
The utility model aims to provide a temperature coefficient of resistance calibration system, which aims at solving the problem that the temperature coefficient of resistance of a nonstandard resistance-temperature sensor cannot be measured or calibrated at present. The resistance-temperature sensor to be measured is measured and calibrated by connecting equipment such as a precise constant temperature tank, a second-class standard platinum resistor, a precise resistance thermometer, a seven-bit half-digital multimeter and the like with a PC through a serial port line.
The technical scheme of the utility model is as follows:
a temperature coefficient of resistance calibration system comprising:
the calibrated unit comprises a calibrated resistor-temperature sensor, a calibrated resistor-temperature sensor junction box and a universal meter, wherein the calibrated resistor-temperature sensor is placed in the precise constant temperature tank, the signal output end of the sensor is connected with the universal meter through the calibrated resistor-temperature sensor junction box, and the signal output end of the universal meter is connected with the PC;
the standard unit comprises a standard platinum resistor, a standard platinum resistor junction box and a thermometer, wherein the standard platinum resistor is arranged in the precise constant temperature tank and is connected with the thermometer through the standard platinum resistor junction box, and the signal output end of the thermometer is connected with the PC;
and the detection signal input end of the PC is respectively connected with the corresponding detection signal input ends of the universal meter and the thermometer, and the control signal output end of the PC is connected with the precise thermostatic bath.
And a precision thermostatic bath for placing the calibrated resistance-temperature sensor and the standard platinum resistance and providing the same environment.
Further, the model of the precision thermostatic bath is TL-1010SA
Further, the standard platinum resistor adopts a second-class standard platinum resistor.
Further, the multimeter adopts a seven-bit half-digital multimeter.
Further, the signal output end of the thermometer is connected with the PC through a USB-B serial port line; the signal output end of the universal meter is connected with the PC through a GPIB-USB-HS+ serial port line; the control signal output end of the PC is connected with the precision thermostatic bath through a serial port line from RS232 to USB.
Further, a precision constant temperature tank end cover is arranged at the upper end of the working space of the precision constant temperature tank, and a fixing hole is formed in the precision constant temperature tank end cover; the standard platinum resistor is inserted below the liquid level in the precise constant temperature tank through the fixing hole;
a sensor test groove is arranged in the working space of the precise constant temperature tank and is used for placing a calibrated resistor-temperature sensor.
Further, the precise constant temperature tank uses diluted ethylene glycol antifreeze as a medium, and the temperature control range is 0-100 ℃.
Further, the sensor test slot is provided with a fixing structure, which comprises a right fixing handle, a left fixing handle, a front fixing block and a rear fixing block;
the right fixed handle and the left fixed handle are provided with jacks, and the right fixed plug and the left fixed plug are inserted into the precision constant temperature groove end cover and the jacks, so that the sensor test groove can be attached to the precision constant temperature groove end cover;
the front fixing block and the rear fixing block are fixed at the front and the rear of the lower end of the sensor test groove through hinges, the front fixing block and the rear fixing block are respectively connected with a front stretching wire terminal and a rear stretching wire terminal through a front stretching wire and a rear stretching wire, the front stretching wire terminal and the rear stretching wire terminal are respectively arranged at the front side and the rear side of the upper end of the sensor test groove, and the lowering and the folding of the corresponding fixing blocks are controlled through rotating the stretching wire terminals; the front fixing block and the rear fixing block can be leaned against the inner wall of the working area of the precise constant temperature groove when put down.
Further, the top of the sensor test groove is provided with a rubber plug strip for sealing an opening at the upper part of the sensor test groove, so that convection of outside air in the groove in the calibration process is prevented.
The utility model has the beneficial effects that:
the system has simple structure, and can automatically measure and calibrate the resistance temperature coefficient of the resistance-temperature sensor to be measured within the range of 0-100 ℃, thereby being convenient and practical.
Additional features and advantages of the utility model will be set forth in the detailed description which follows.
Drawings
The foregoing and other objects, features and advantages of the utility model will be apparent from the following more particular descriptions of exemplary embodiments of the utility model as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the utility model.
Fig. 1 is a schematic view of the overall structure of the present utility model.
FIG. 2 is a schematic diagram of a sensor test slot of the present utility model.
Fig. 3 is a system configuration diagram of the present utility model.
In the figure: 1. a precision thermostatic bath; 2. a precision thermostatic bath end cover; 3. standard platinum resistance; 4. a sensor test slot; 5. calibrated resistance-temperature sensor; 6. standard platinum resistor junction boxes; 7. a high-precision thermometer; 8. a multimeter; 9. a calibrated resistance-temperature sensor junction box; 10. USB-B serial port line; 11. GPIB-USB-HS+ serial port line; 12. a PC; 13. RS232 to USB serial line.
201. A right fixed plug; 202. a right fixed handle; 203. a front tension wire terminal; 204. a front stretch line; 205. a front fixed block; 206. a rear fixed block; 207. post-stretching the wire; 208. a left fixed handle; 209. a left fixed plug; 210. post-stretching the wire terminal; 211. rubber plugs.
Detailed Description
Preferred embodiments of the present utility model will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present utility model are shown in the drawings, it should be understood that the present utility model may be embodied in various forms and should not be limited to the embodiments set forth herein.
As shown in fig. 1, a temperature coefficient of resistance calibration system of the present utility model includes: a precision thermostatic bath 1; a precision thermostatic bath end cover 2; a standard platinum resistor 3; a sensor test slot 4; a calibrated resistance-temperature sensor 5; a standard platinum resistor junction box 6; a thermometer 7; a multimeter 8; a calibrated resistance-temperature sensor junction box 9; a USB-B serial port line 10; GPIB-USB-HS+ serial port line 11; a PC 12; RS232 to USB serial port line 13, etc.
In this embodiment, the model number of the precision thermostat 1 is TL-1010SA, and the precision thermostat 1 is connected to the PC 12 through an RS232 to USB serial port line 13, and can be set, started and stopped by instructions; the precise thermostatic bath 1 uses the diluted ethylene glycol antifreeze as a medium, and the temperature control range is (0-100); the diameter of the working space of the precision constant temperature tank 1 is 150mm, the precision constant temperature tank end cover 2 is placed at the upper end of the working space of the precision constant temperature tank 1, and is manufactured by customizing a bakelite plate, and the thickness is 15mm.
In this embodiment, the standard platinum resistor 3 is a second-class standard platinum resistor, which is inserted into a fixing hole of the end cover 2 of the precision thermostatic bath, is inserted 300mm below the liquid level, and is connected with the second-class standard platinum resistor junction box 6 through a four-wire system connection, the second-class standard platinum resistor junction box 6 is connected with the thermometer 7 through a four-wire system aviation plug connection wire, the thermometer 7 is connected with the PC 12 through a USB-B serial port line 10, real-time data acquisition can be performed on the thermometer 7 through instructions, the model of the thermometer 7 is HDT1002, and the measurement error is confirmed to be within 5mK through tracing.
In this embodiment, the sensor test groove 4 is a flat groove made of stainless steel, the total length is 400mm, the thickness of the inner space is 5mm, the sensor test groove is waterproof and leak-proof, the lower end is placed in the working space of the precision thermostatic bath 1, the upper end is fixed on the precision thermostatic bath end cover 2, and the calibrated resistance-temperature sensor 5 can be connected through four wires and placed in the sensor test groove 4; the calibrated resistor-temperature sensor 5 is connected to the calibrated resistor-temperature sensor junction box 9, the calibrated resistor-temperature sensor junction box 9 is connected with the universal meter 8, the universal meter 8 is connected with the PC 12 through the GPIB-USB-HS+ serial port line 11, the model number of the universal meter 8 is 324420A, and four-wire ohm gears are used for measuring the calibrated resistor-temperature sensor 5.
As shown in fig. 2, which is a detailed view of the structure of the sensor test slot 4, the length, width and thickness of the right fixing handle 202 and the left fixing handle 208 are respectively 60mm, 20mm and 8mm, which can be attached to the end cover 2 of the precision thermostatic slot, and a jack is left at a corresponding position, and the right fixing plug 201 and the left fixing plug 209 are inserted into the corresponding holes to play a role of fixing; the front fixing block 205 and the rear fixing block 206 are solid stainless steel blocks, the length, the width and the thickness are respectively 80mm, 40mm and 10mm, the front fixing block 205 and the rear fixing block 206 are fixed on the front and the rear of the sensor test groove 4 through hinges, the front stretching line 204 and the rear stretching line 207 control the front fixing block 205 and the rear fixing block 206 to be put down and retracted, and the front fixing block 205 and the rear fixing block 206 can be leaned against the inner wall of the working area of the precision constant temperature groove 1 when put down for fixing and preventing the sensor test groove 4 from shaking in the measuring and calibrating process; the front stretching wire 204 and the rear stretching wire 207 are respectively fixed on the front stretching wire terminal 203 and the rear stretching wire terminal 210, and the front fixing block 205 and the rear fixing block 206 are put down and retracted by rotating the front stretching wire terminal 203 and the rear stretching wire terminal 210; when the sensor test groove 4 is to be taken out from the precision thermostatic bath 1, the front fixing block 205 and the rear fixing block 206 need to be taken out after being retracted; the rubber plug 211 is a sealing device for the upper opening of the sensor test slot 4, and is used for sealing the opening after the test wires are led out, so that the convection of the inside and outside air of the sensor test slot 4 in the test process is prevented, and the measurement and calibration results are influenced.
The specific implementation method comprises the following steps:
the PC 12 is controlled by an RS 232-USB serial port line 13 and the precise thermostatic bath 1 through ASCII code instructions, the PC 12 sends an ON and OF instruction which are the control temperature switch, ST30.000 is an instruction for setting a control temperature point OF 30 ℃, the return ST instruction is the successful setting, the temperature control range OF the precise thermostatic bath 1 is 0-100 ℃, and the PC 12 sends a T2 instruction and returns the real-time temperature OF the precise thermostatic bath 1; the temperature interval is controlled to be 5 ℃ in the calibration procedure, namely 0 ℃, 5 ℃, 10 ℃. 55 ℃ and 100 ℃.
The PC 12 is connected with the thermometer 7 through a USB-B serial port line 10, and reads the reading of the measured second class standard platinum resistor 3 in real time by receiving a returned ASCII instruction, and the temperature magnitude can be directly traced to the China national institute of metrology science; taking the acquired real-time temperature of the thermometer 7 as a judgment, when the temperature fluctuation degree is less than 10mK/5min (within 5min, half of the difference value between the maximum value and the minimum value of the measured temperature of the thermometer 7 is the temperature fluctuation degree), and when the temperature fluctuation degree is met, the temperature of the precision thermostatic bath 1 is stable;
the PC 12 is connected with the universal meter 8 through a GPIB-USB-HS+ serial port line 11, reads the four-wire system ohm-gear reading of the universal meter 8 in real time through instructions, and sets a proportional-integral time of 2 NPLCs;
setting the calibrated measurement temperature range not to exceed (0-100), setting the temperature interval to 5 ℃, setting the temperature fluctuation degree to 10mK/5min, starting to record real-time acquisition data of the universal meter 8 after the precision thermostatic bath 1 reaches the temperature fluctuation degree, recording for 5min, taking the average value as the resistance value of the resistance-temperature sensor 5 at the current temperature, performing linear fitting according to the following formula after all temperature points are measured,
wherein R is t The resistance value of the resistance-temperature sensor 05 at t ℃ is omega; r is R 20 Resistance value of the resistance-temperature sensor 5 at 20 ℃, Ω; t is the calibration temperature, DEG C; alpha is the primary resistance temperature coefficient, 1/°C; beta is the temperature coefficient of secondary resistance, 1/DEGC 2 。
The foregoing description of embodiments of the utility model has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described.
Claims (9)
1. A temperature coefficient of resistance calibration system, comprising:
the calibrated unit comprises a calibrated resistor-temperature sensor (5), a calibrated resistor-temperature sensor junction box (9) and a universal meter (8), wherein the calibrated resistor-temperature sensor (5) is placed in the precise constant temperature tank (1), a sensor signal output end is connected with the universal meter (8) through the calibrated resistor-temperature sensor junction box (9), and a signal output end of the universal meter (8) is connected with the PC (12);
the standard unit comprises a standard platinum resistor (3), a standard platinum resistor junction box (6) and a thermometer (7), wherein the standard platinum resistor (3) is arranged in the precise constant temperature tank (1), the standard platinum resistor (3) is connected with the thermometer (7) through the standard platinum resistor junction box (6), and the signal output end of the thermometer (7) is connected with the PC (12);
the detection signal input end of the PC (12) is respectively connected with the corresponding detection signal input ends of the universal meter (8) and the thermometer (7), and the control signal output end of the PC (12) is connected with the precise constant temperature tank (1);
and a precision thermostatic bath (1) for placing the calibrated resistance-temperature sensor (5) and the standard platinum resistance (3) and providing the same environment.
2. A temperature coefficient of resistance calibration system according to claim 1, characterized in that the precision thermostatic bath (1) is of model TL-1010SA.
3. The temperature coefficient of resistance calibration system according to claim 1, wherein the standard platinum resistor (3) is a second-class standard platinum resistor.
4. The temperature coefficient of resistance calibration system according to claim 1, wherein the multimeter (8) is a seven-digit half-digital multimeter.
5. The temperature coefficient of resistance calibration system according to claim 1, wherein the signal output end of the thermometer (7) is connected with the PC (12) through a USB-B serial port line (10); the signal output end of the universal meter (8) is connected with the PC (12) through a GPIB-USB-HS+ serial port line (11); the control signal output end of the PC (12) is connected with the precision constant temperature tank (1) through an RS 232-to-USB serial port line (13).
6. The system of claim 1, wherein the temperature coefficient of resistance calibration system,
the upper end of the working space of the precise constant temperature tank (1) is provided with a precise constant temperature tank end cover (2), and the precise constant temperature tank end cover (2) is provided with a fixing hole; the standard platinum resistor (3) passes through the fixing hole and is inserted below the liquid level in the precise constant temperature tank (1);
a sensor test groove (4) is arranged in the working space of the precision constant temperature groove (1) and is used for placing a calibrated resistance-temperature sensor (5).
7. The resistor temperature coefficient calibration system according to claim 6, wherein the precise constant temperature tank (1) uses diluted ethylene glycol antifreeze as a medium, and the temperature control range is 0-100 ℃.
8. The temperature coefficient of resistance calibration system according to claim 6, wherein the sensor test slot (4) is provided with a fixing structure comprising a right fixing handle (202), a left fixing handle (208), a front fixing block (205) and a rear fixing block (206);
the right fixed handle (202) and the left fixed handle (208) are provided with jacks, and the right fixed plug (201) and the left fixed plug (209) are inserted into the precision thermostatic bath end cover (2) and the jacks, so that the sensor test groove (4) can be attached to the precision thermostatic bath end cover (2);
the front fixing block (205) and the rear fixing block (206) are fixed at the front and the rear of the lower end of the sensor test groove (4) through hinges, the front fixing block (205) and the rear fixing block (206) are respectively connected with the corresponding front stretching wire terminal (203) and the corresponding rear stretching wire terminal (210) through a front stretching wire (204) and a rear stretching wire (207), and the front stretching wire terminal (203) and the rear stretching wire terminal (210) are respectively arranged at the front side and the rear side of the upper end of the sensor test groove (4) and are controlled to be put down and retracted through rotating the stretching wire terminals; the front fixing block (205) and the rear fixing block (206) can be leaned against the inner wall of the working area of the precision thermostatic bath (1) when put down.
9. The system according to claim 8, wherein the top of the sensor test slot (4) is provided with a rubber plug (211) for sealing the upper opening of the sensor test slot (4) to prevent convection of air from the outside of the slot during calibration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320069768.9U CN219589847U (en) | 2023-01-10 | 2023-01-10 | Temperature coefficient of resistance calibration system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320069768.9U CN219589847U (en) | 2023-01-10 | 2023-01-10 | Temperature coefficient of resistance calibration system |
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| CN219589847U true CN219589847U (en) | 2023-08-25 |
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| CN202320069768.9U Active CN219589847U (en) | 2023-01-10 | 2023-01-10 | Temperature coefficient of resistance calibration system |
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- 2023-01-10 CN CN202320069768.9U patent/CN219589847U/en active Active
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