CN113701921A - Method for measuring self-heating index of thermal resistance thermometer - Google Patents

Method for measuring self-heating index of thermal resistance thermometer Download PDF

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Publication number
CN113701921A
CN113701921A CN202111003422.0A CN202111003422A CN113701921A CN 113701921 A CN113701921 A CN 113701921A CN 202111003422 A CN202111003422 A CN 202111003422A CN 113701921 A CN113701921 A CN 113701921A
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self
voltage
resistance thermometer
thermal resistance
resistance
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宋延勇
苏明旭
郭爱华
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Shanghai Inspection And Testing Institute Of Instruments And Automatic Systems Co ltd
University of Shanghai for Science and Technology
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Shanghai Inspection And Testing Institute Of Instruments And Automatic Systems Co ltd
University of Shanghai for Science and Technology
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K15/00—Testing or calibrating of thermometers
    • G01K15/007—Testing

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Abstract

The invention provides a method for measuring the self-heating index of a thermal resistance thermometer, which is characterized by comprising the following steps of: step S1, connecting the thermal resistance thermometer into the electric bridge, and connecting the reference resistance R1Resistance R2And an adjustable resistance R3Accessing a circuit; step S2, providing low voltage to the bridge to make the current value reach I, adjusting R3Make U1Near zero; step S3, collecting and recording bridge output voltage U1、R1Voltage U across2And R3The resistance value of (1); step S4, calculating the resistance R, the current I and the electric power P of the thermal resistance thermometer under low voltage; step S5, providing high voltage for the bridge, collecting and recording bridge output voltage U 'when the current value reaches I'1(ii) a Step S6, recording reference resistance R1Voltage U 'of'2And the voltage U 'across the thermal resistance thermometer'3(ii) a Step S7, calculating the resistance R ', the current I ' and the electric power P ' of the thermal resistance thermometer under high voltage; step S8, calculating a self-heating index; step S9, repeating for multiple times and calculating the self-heating index; step by stepIn step S10, the average of the self-heating indexes obtained in each step is used as the self-heating index of the resistance thermometer.

Description

Method for measuring self-heating index of thermal resistance thermometer
Technical Field
The invention relates to a method for measuring the self-heating index of a thermal resistance thermometer.
Background
The rapid and effective response of the resistance thermometer for the nuclear reactor can ensure that the reactor can be stopped in time when large temperature transient change occurs. Therefore, accurate measurement of its response time is very important.
At present, the response time of a domestic thermometer is measured off-line by adopting an immersion method under the condition of a laboratory, the thermometer is inserted into water with different ambient temperatures to obtain thermometer step response output so as to measure the response time, and the defect is that the response time needs to be measured off-line and the change of the response time under different operating conditions cannot be reflected.
However, the thermometer mainly plays a role in monitoring temperature changes in real time, is in a core position in the whole temperature measurement system, and has many problems such as production halt and shutdown if offline measurement is performed, so that the production efficiency of enterprises is greatly influenced, and the operation cost of the enterprises is increased.
Disclosure of Invention
In order to solve the problems, the invention provides a method for measuring the self-heating index of a thermal resistance thermometer, which adopts the following technical scheme:
the invention provides a method for measuring the self-heating index of a thermal resistance thermometer, which is characterized by comprising the following steps of: step S1, connecting the thermal resistance thermometer to the terminal of the bridge A, B, and connecting C, E to the reference resistor R1E, D terminating resistor R2And D, A terminating adjustable resistor R3(ii) a Step S2, providing low voltage for the electric bridge, adjusting the low voltage to make the current value of the object reach I, waiting for the electric bridge output voltage U at the end C, D of the electric bridge1After the stability is kept, the adjustable resistor R is adjusted3Make the bridge output voltage U1Near zero; step S3, collecting and recording bridge output voltage U1Reference resistance R1Voltage U across2And an adjustable resistance R3The resistance value of (1); step S4, according to the reference resistance R1And a resistance R2Calculating resistance value R, current I and electric power P when the thermal resistance thermometer reaches a steady state under low voltage; step S5, toThe bridge supplies high voltage, the high voltage is adjusted to enable the current value of the thermal resistance thermometer to reach I ', and the output voltage U ' of the bridge is collected and recorded '1(ii) a Step S6, synchronously acquiring and recording the reference resistance R1C, E voltage U'2And a voltage U 'across a thermal resistance thermometer A, B'3(ii) a Step S7, calculating the resistance R ', the current I ' and the electric power P ' of the thermal resistance thermometer when the thermal resistance thermometer reaches the steady state under the higher voltage; step S8, calculating self-heating index SHI; step S9, repeating the steps S2 to S8 for a plurality of times in a circulating manner, and respectively calculating the self-heating index SHI of each time; step S10, averaging the self-heating indexes SHI obtained in each time to obtain an average value
Figure BDA0003236386890000022
As a thermal resistance thermometer self-heating index.
The method for measuring the self-heating index of the thermal resistance thermometer provided by the invention can also have the technical characteristics that the current value I ranges from 1mA to 6 mA.
The invention provides a method for measuring the self-heating index of a thermal resistance thermometer, which can also have the technical characteristics that the expression of the resistance value R is as follows:
Figure BDA0003236386890000021
the method for measuring the self-heating index of the thermal resistance thermometer provided by the invention can also have the technical characteristics that the current value I' ranges from 20mA to 60 mA.
The invention provides a method for measuring the self-heating index of a thermal resistance thermometer, which can also have the technical characteristics that the expression of the resistance R' is as follows:
Figure BDA0003236386890000031
the invention provides a method for measuring the self-heating index of a thermal resistance thermometer, which can also have the technical characteristics that the expression of the self-heating index is as follows:
Figure BDA0003236386890000032
action and Effect of the invention
According to the method for measuring the self-heating index of the thermal resistance thermometer, the voltage at two ends of the resistance, the voltage at two ends of the reference resistance and the voltage at two ends of the thermal resistance thermometer are output by the measuring bridge, so that the self-heating index of the thermal resistance thermometer can be calculated according to the voltages when the heat transfer characteristics of the thermal resistance thermometer are changed due to abnormal installation or long-term use.
Secondly, the invention synchronously measures the voltage at two ends of the reference resistor and the voltage at two ends of the thermal resistance thermometer by measuring the voltage at two ends of the bridge output resistor, calculates the resistance value and the current value of the thermal resistance thermometer under the steady state under the low voltage and the high voltage, solves the problem that the unbalance bridge has larger error in measuring the resistance value and can not simultaneously obtain the current value flowing through the measured object, improves the accuracy of measuring the resistance value of the unbalance bridge and the synchronism of current measurement when the resistance value of the measured object changes greatly, thereby improving the measurement accuracy and efficiency of the self-heating index of the measured object.
Drawings
FIG. 1 is a flow chart of a method for measuring the self-heating index of a thermal resistance thermometer in an embodiment of the present invention;
FIG. 2 is a schematic diagram of a thermal resistance thermometer self-heating index testing apparatus in an embodiment of the present invention.
Detailed Description
In order to make the technical means, the creation features, the achievement purposes and the effects of the invention easy to understand, the measurement method of the invention is specifically described below with reference to the embodiment and the accompanying drawings.
< example >
FIG. 1 is a flow chart of a method for measuring the self-heating index of a thermal resistance thermometer according to an embodiment of the present invention.
FIG. 2 is a schematic diagram of a thermal resistance thermometer self-heating index testing apparatus of the present invention.
Step S1, as shown in FIG. 1 and FIG. 2, two leads of the thermal resistance thermometer are disconnected from the original measuring system, and connected to A, B two terminals, C, E is connected to the reference resistor R1E, D terminating resistor R2And D, A terminating adjustable resistor R3。
Step S2, switching on the power supply, supplying power to the bridge by using a lower voltage value, adjusting the voltage value to make the current value I passing through the object to be measured be 1 mA-6 mA, and collecting the voltage U at the two ends of the output C, D of the bridge by an AD collecting circuit1And a reference resistance R1C, E voltage U across2. Adjusting the adjustable resistance R3So that the bridge outputs a voltage U1Close to zero.
Step S3, wait for U1After the value is displayed stably, recording the resistance value R of the adjustable resistor3,U1And U2。
Step S4, recording the resistance R of the adjustable resistor3,U1And U2And calculating the resistance value R of the thermal resistance thermometer when the thermal resistance thermometer reaches a steady state under low voltage:
Figure BDA0003236386890000051
calculating the current I, and the formula is as follows:
Figure BDA0003236386890000052
calculating the electric power P, the formula is as follows:
P＝I2×R。
step S5, setting a higher voltage value to supply power to the bridge, and setting the voltage to make the current value I passing through the measured object be 20mA ∞60 mA. The voltage U 'at two ends of the bridge output C, D is acquired through an AD acquisition circuit'1And a voltage U 'across C, E of a reference resistor R1'2And a voltage U 'across A, B of the object to be measured'3。
Step S6, waiting for U'1After being stabilized, U 'is recorded'2And U'3。
Step S7, calculating the resistance R' of the thermal resistance thermometer at the steady state under the higher voltage, the formula is as follows:
Figure BDA0003236386890000053
calculating the current I', the formula is as follows:
Figure BDA0003236386890000054
calculating the electric power P', the formula is as follows:
P'＝I'2×R'
step S8, calculating the self-heating index SHI of the thermal resistance thermometer, which is as follows:
Figure BDA0003236386890000055
in this embodiment, the self-heating index SHI is a characteristic parameter of a thermal resistance thermometer expressed in ohms/watt. The resistance change amount of the thermal resistance thermometer is expressed by a ratio of the magnitude of the input electric power causing the resistance change due to internal heat. For a hot resistance thermometer installed in the field, the response time of the hot resistance thermometer itself is a function of the self-heating index under the same external fluid conditions.
In step S9, ten sets of the above measurements are repeated, and the self-heating index SHI of each thermal resistance thermometer is recorded.
Step S10, calculating the average value of the results of the ten tests
Figure BDA0003236386890000061
As a thermal resistance thermometer self-heating index.
TABLE 1 test results of response time and self-heating index for different flow rates of a thermal resistance thermometer
Figure BDA0003236386890000062
In this example, the response time and the self-heating index of the thermal resistance thermometer were measured by measuring the temperature at different flow rates. As shown in table 1, the self-heating index reflects the change of the response time, the natural index becomes large, the average response time also becomes large, and the validity of the measurement method and the consistency of the results are verified.
Examples effects and effects
According to the method for measuring the self-heating index of the thermal resistance thermometer provided by the embodiment, the bridge is used for measuring the voltage at two ends of the resistor, the voltage at two ends of the reference resistor and the voltage at two ends of the thermal resistance thermometer, so that the self-heating index of the thermal resistance thermometer can be calculated according to the voltages when the heat transfer characteristics of the thermal resistance thermometer are changed due to abnormal installation or long-term use.
Secondly, in the embodiment, the voltage at the two ends of the reference resistor and the voltage at the two ends of the thermal resistance thermometer are synchronously measured by measuring the voltage at the two ends of the bridge output resistor, and the resistance value and the current value of the thermal resistance thermometer in a steady state under low voltage and high voltage are calculated, so that the problem that the current value flowing through the measured object cannot be simultaneously obtained due to large error of the measured resistance value of the unbalanced bridge is solved, the accuracy of the resistance value measurement of the unbalanced bridge and the synchronism of the current measurement when the resistance value of the measured object changes greatly are improved, and the measurement precision and the efficiency of the self-heating index of the measured object are improved.
The above-described embodiments are merely illustrative of specific embodiments of the present invention, and the present invention is not limited to the description of the above-described embodiments.

Claims (6)

1. A method for measuring the self-heating index of a thermal resistance thermometer is characterized by comprising the following steps:
step S1, connecting the thermal resistance thermometer to the terminal of the bridge A, B, and connecting C, E to the reference resistor R1E, D terminating resistor R2And D, A terminating adjustable resistor R3；
Step S2, providing low voltage for the electric bridge, adjusting the low voltage to make the current value of the object to be measured reach I, waiting for the electric bridge output voltage U at the end C, D of the electric bridge1After the stability is kept, the adjustable resistor R is adjusted3Make the bridge output voltage U1Near zero;
step S3, collecting and recording the output voltage U of the electric bridge1The reference resistance R1Voltage U across2And the adjustable resistor R3The resistance value of (1);
step S4, according to the reference resistance R1And the resistance R2The resistance value, namely calculating the resistance value R, the current I and the electric power P of the thermal resistance thermometer when the thermal resistance thermometer reaches a steady state under low voltage;
step S5, providing high voltage for the bridge, adjusting the high voltage to enable the current value of the thermal resistance thermometer to reach I ', and collecting and recording bridge output voltage U'1；
Step S6, synchronously acquiring and recording the reference resistance R1C, E voltage U'2And a voltage U 'across a thermal resistance thermometer A, B'3；
Step S7, calculating the resistance R ', the current I ' and the electric power P ' of the thermal resistance thermometer when the thermal resistance thermometer reaches the steady state under the higher voltage;
step S8, calculating self-heating index SHI;
step S9, repeating the steps S2 to S8 for a plurality of times in a circulating manner, and respectively calculating the self-heating index SHI of each time;
step S10, averaging the self-heating indexes SHI obtained in each time to obtain an average value
Figure FDA0003236386880000011
As a thermal resistance thermometer self-heating index.
2. A method of measuring the self-heating index of a resistance thermometer according to claim 1, wherein:
wherein the current value I ranges from 1mA to 6 mA.
3. The method of claim 1, wherein the method comprises the steps of:
wherein, the expression of the resistance value R is as follows:
Figure FDA0003236386880000021
4. a method of measuring the self-heating index of a resistance thermometer according to claim 1, wherein:
wherein the current value I' ranges from 20mA to 60 mA.
5. A method of measuring the self-heating index of a resistance thermometer according to claim 1, wherein:
wherein, the expression of the resistance value R' is as follows:
Figure FDA0003236386880000022
6. a method of measuring the self-heating index of a resistance thermometer according to claim 1, wherein:
wherein the expression of the self-heating index is:
Figure FDA0003236386880000031
CN202111003422.0A 2021-08-30 2021-08-30 Method for measuring self-heating index of thermal resistance thermometer Pending CN113701921A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1313964A (en) * 1998-08-21 2001-09-19 罗斯蒙德公司 Resistance based process control device diagnostics
CN1323389A (en) * 1998-10-19 2001-11-21 罗斯蒙德公司 Auto correcting temperature transmitter with resistance based sensor
CN102207413A (en) * 2011-03-18 2011-10-05 上海贝洱热系统有限公司 Detection circuit and method of temperature sensor
CN105890807A (en) * 2016-03-24 2016-08-24 深圳市诺天恒科技有限公司 Temperature monitoring technique for heating filament of low-resistance atomizer
CN112484885A (en) * 2020-11-06 2021-03-12 上海核工程研究设计院有限公司 Automatic implementation method for thermal resistor in-situ response time test

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1313964A (en) * 1998-08-21 2001-09-19 罗斯蒙德公司 Resistance based process control device diagnostics
CN1323389A (en) * 1998-10-19 2001-11-21 罗斯蒙德公司 Auto correcting temperature transmitter with resistance based sensor
CN102207413A (en) * 2011-03-18 2011-10-05 上海贝洱热系统有限公司 Detection circuit and method of temperature sensor
CN105890807A (en) * 2016-03-24 2016-08-24 深圳市诺天恒科技有限公司 Temperature monitoring technique for heating filament of low-resistance atomizer
CN112484885A (en) * 2020-11-06 2021-03-12 上海核工程研究设计院有限公司 Automatic implementation method for thermal resistor in-situ response time test

Non-Patent Citations (3)

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Title
刘亮辉，余刃: "核动力装置测量仪表在线检测与校准技术研究", 自动化与仪表 *
宋延勇,苏明旭,王子安: "核电厂电阻温度计响应时间测量方法比对研究", 核科学与工程 *
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