CN101319940B - Test device and use method of long-rod platinum resistance thermometer - Google Patents
Test device and use method of long-rod platinum resistance thermometer Download PDFInfo
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- CN101319940B CN101319940B CN2007101256091A CN200710125609A CN101319940B CN 101319940 B CN101319940 B CN 101319940B CN 2007101256091 A CN2007101256091 A CN 2007101256091A CN 200710125609 A CN200710125609 A CN 200710125609A CN 101319940 B CN101319940 B CN 101319940B
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Abstract
The invention belongs to the technical field of product testing and relates to a testing device for a long rod platinum resistance thermometer with a length over 700mm in particular. The testing device include a constant temperature water bath device and at least two standard thermometers; the constant temperature water bath device includes a water bath chamber which can be inserted into the long rod platinum resistance thermometer to be tested; the two standard thermometers are respectively inserted into the two ends of the water bath chamber as well. The testing device not only has a simple structure and is conveniently used, but also greatly reduces the testing cost. The invention also relates to a method for testing the long rod platinum resistance thermometer with the testing device; the method includes the steps as follows: firstly inserting the long rod platinum resistance thermometer into any end of the water bath chamber; then setting the temperature value of the constant temperature water bath device and waiting for a temperature field to be stable; then reading the values of each thermometer in turn and working out a standard temperature value by utilizing the values of the standard thermometers; then comparing the temperature value of the long rod platinum resistance thermometer to be tested with the standard temperature value and judging the measuring characteristic of the standard temperature value; resetting at least two temperature values to the constant temperature water bath device and repeating the steps.
Description
Technical field
The invention belongs to the product test technical field, relate in particular to proving installation and using method thereof that a kind of length surpasses the long-rod platinum resistance thermometer of 700MM.
Background technology
Condenser long-rod platinum resistance thermometer is a kind of surveying instrument commonly used in the nuclear power station, particularly, mainly is to be used for measuring condenser seawer outlet water temperature.Condenser long-rod platinum resistance thermometer comprises protective casing and temperature-sensing element, and the length of this protective casing is (2100 ± 150) mm, and external diameter is 6mm; temperature-sensing element is a platinum resistance; be provided with 3 temperature-sensing elements in the every sleeve pipe altogether, be evenly distributed in the whole sleeve pipe, draw by three-wire system.For 0～60 ℃ of temperature range, the resistance characteristic of condenser long-rod platinum resistance thermometer is R (t)=R (0 ℃) * (1+At+Bt2), water triple point resistance value R (0 ℃)=100 Ω of thermometer.Because the measurement accuracy of condenser seawer outlet medial temperature plays crucial effects to turbine efficiency test, condenser efficiency test, 0.1 ℃ of long-rod platinum resistance thermometer error can cause the CRF flow differ 1% and cleanliness differ 1%, this causes the error evaluation to condenser and Steam Turbine most probably, therefore, the accuracy of measurement to the long-rod platinum resistance thermometer has quite high requirement.
All the time, the domestic device that all this stock resistance thermometer is not accurately detected has especially surpassed the stock resistance thermometer that 700mm reaches the 2000mm standard for length and has all had no idea to detect, and only sends Britain outside and detects.The proving installation that Britain adopts can accurately detect the long-rod platinum resistance thermometer, but this proving installation is complex structure not only, and with high costs, the measurement expense of every stock resistance thermometer is just up to 300 pounds, head and shoulders above the ability to bear of domestic enterprise.
Summary of the invention
A technical matters to be solved by this invention provides a kind of proving installation of long-rod platinum resistance thermometer, and is simple in structure, easy to use and testing cost is lower.
Another technical matters to be solved by this invention provides the method that a kind of aforementioned proving installation detects the long-rod platinum resistance thermometer.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:
A kind of pick-up unit of long-rod platinum resistance thermometer is provided, it comprises a constant temperature water bath apparatus and at least two standard thermometers, described constant temperature water bath apparatus comprises that again one can insert the water-bath chamber of long-rod platinum resistance thermometer to be measured, described two standard thermometers also insert the two ends of this water-bath chamber respectively, described water-bath chamber tilts to place horizontal by angle, described water-bath also is provided with a vent valve on the chamber, and described vent valve is arranged on the higher end in position, described water-bath chamber.
Adopt after such structure, only need long-rod platinum resistance thermometer to be measured is inserted the water-bath chamber, read long-rod platinum resistance temperature to be measured and take into account the numerical value of standard thermometer, and compare the calibration operation that to finish long-rod platinum resistance thermometer to be measured.Compared with prior art, not only simple in structure, easy to use, and also measurement structure has higher accuracy, greatly reduces testing cost, alleviated the burden of enterprise.
A kind of method of using above-mentioned detection device to detect the long-rod platinum resistance thermometer is provided, earlier long-rod platinum resistance thermometer to be measured is inserted arbitrary end of described water-bath chamber, configure the temperature value of described constant temperature water bath apparatus again, wait for that the temperature field is stable; Then, read the temperature value that described standard temperature is taken into account long-rod platinum resistance thermometer to be measured successively, utilize the value of standard thermometer to calculate the standard temperature value, the temperature value with long-rod platinum resistance thermometer to be measured compares to determine its meter characteristic with it then; Described constant temperature water bath apparatus is reseted two temperature values at least again, and repeat abovementioned steps.
Description of drawings
Fig. 1 is the structural representation of a preferred embodiment provided by the invention.
Embodiment
In order to make technical matters to be solved by this invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
A preferred embodiment as shown in Figure 1, it comprises a constant temperature water bath apparatus and at least two standard thermometers 1, described constant temperature water bath apparatus comprises that again one can insert the water-bath chamber 2 of long-rod platinum resistance thermometer 3 to be measured, and described two standard thermometers 1 also insert the two ends of this water-bath chamber 2 respectively.In the present embodiment, the various products that constant temperature water bath apparatus can adopt prior art to provide preferably adopt horizontal constant temperature water bath apparatus; A long 2m that window is housed can be adopted in water-bath chamber 2, the long tube of diameter 30cm, and can add Upper gasket and flange at two ends, and on flange, offer relevant opening, be used to insert long-rod platinum resistance thermometer 3 to be measured and standard thermometer 1; The two ends of water-bath chamber 2 are respectively equipped with a water-bath support, play the effect of supporting water-bath chamber 2; In addition, high accuracy number multimeter (0.01 and above precision) and contact thermoelectrical potential 4 low potential switches less than 0.4 μ V also can be set in this proving installation, high accuracy number multimeter, standard thermometer 1 and tested long-rod platinum resistance thermometer all are connected on the low potential switch, and check that indicating value is all in minute kilsyth basalt scope.
Only need long-rod platinum resistance thermometer 3 to be measured is inserted water-bath chamber 2, read the numerical value of long-rod platinum resistance thermometer 3 to be measured and standard thermometer 1, and compare the calibration operation that to finish long-rod platinum resistance thermometer 3 to be measured.Compared with prior art, not only simple in structure, easy to use, and also measurement structure has higher accuracy, greatly reduces testing cost, alleviated the burden of enterprise.
As the further improvement of aforementioned techniques scheme, standard thermometer 1 is second-class standard platinum resistance thermometer, and calibration certificate must be before the deadline; Water-bath chamber 2 is to tilt to place, and is concrete, can adjust the water-bath support of water-bath chamber 2 one ends, makes water-bath chamber 2 towards lopsidedness, preferred, and the angle that water-bath chamber 2 is become with surface level is 10～15 degree.In addition, can also also be provided with a vent valve 21 on the water-bath chamber 2, this vent valve 21 is arranged on the higher end in 2 positions, described water-bath chamber, can emit the air in the container like this, to avoid the influence of air to measuring accuracy.
As further specializing of aforementioned schemes, constant temperature water bath apparatus can comprise that also a hot water storgae 4 and that adds that has temperature regulating device adds the water pump 5 that hot water storgae 4 is connected with this, and this water pump 5 and temperature regulating device all are connected with described water-bath chamber 2.Concrete, the outlet of water pump 5 with add hot water storgae 4 and be connected, the outlet that adds hot water storgae 4 then communicates with water-bath chamber 2, water just can flow into from water pump 5 and add hot water storgae 4 like this, after adding the temperature regulating device processing in the hot water storgae 4, to enter from the lower end of water-bath chamber 2 from adding the thermostatted water that hot water storgae 4 comes out, and discharge from the upper end of water-bath chamber 2 and to enter water pump 5 and circulate once more.In addition, as shown in Figure 1, one water replanishing device 6, clip 64 and three valves 61,62,63 also can be set in this constant temperature water bath apparatus, clip 64 is arranged between water pump 5 and the water-bath chamber 2, water replanishing device 6 with add hot water storgae 4 and be connected, valve 62,63 is connected water replanishing device 6 and adds between the hot water storgae 4, and 61 on valve is connected with other valve 62,63 and water replanishing device 6 respectively.When valve 62 is opened, valve 63, when clip 64 cuts out, constant temperature water bath apparatus is in the retaining state; When valve 62, valve 63 and clip 64 are opened, and valve 61, when water replanishing device 6 is closed, then be in interior recurrent state.Also can establish a vent valve 21 on the water pump 5.
Because reading at one time, so in the test process, the artificial reading of standard platinum resistance thermometer and tested long-rod platinum resistance thermometer inevitably exists error, in order further to reduce this error, as the further improvement of aforementioned techniques scheme, the processor that can gather standard thermometer 1 and long-rod platinum resistance thermometer 3 temperature values to be measured can be set also in the pick-up unit.Concrete, can adopt a computer and a cover computer data acquiring and a process software, 9935 LogWare II real-time data acquisition softwares as Hart Scientific company, set rational hits and after the sampling period, can gather automatically measurement data, and the data of passing through to be gathered generate Calibration Report automatically.Not only reduced the error of hand computation, effectively improved the accuracy and the repeatability of pick-up unit, work efficiency is significantly improved.
As a kind of embodiment that uses above-mentioned detection device to detect the method for long-rod platinum resistance thermometer, according to Fig. 1 various devices and element are connected earlier.Several long-rod platinum resistance thermometers 3 to be measured are inserted arbitrary end of described water-bath chamber 2, and seal, configure the temperature value of described constant temperature water bath apparatus again, wait for that the temperature field is stable with sealing ring and nut; Then, the commonsense method that adopts prior art to provide is read the temperature value of described second-class standard platinum resistance thermometer and long-rod platinum resistance thermometer 3 to be measured successively, utilize the value of standard thermometer 1 to calculate the standard temperature value, the temperature value with long-rod platinum resistance thermometer 3 to be measured compares to determine its meter characteristic with it then; Described constant temperature water bath apparatus is reseted two temperature values at least again, and repeat abovementioned steps.
Concrete, before test, can do assembly quality and visual examination earlier, comprise that checking that thermal resistance should not have opens circuit or short circuit phenomenon, whether its assembly quality of visual inspection and outward appearance be correct, reliable and do not have a Short Item.Protection tube should be intact, and indenture, cut and significantly corrosion must not be arranged; Three temperature values that are used for calibrating be respectively 25 ℃ (or normal temperature), 35 ℃ and 45 ℃;
Behind the temperature value that configures described constant temperature water bath apparatus in this method, the reading of two standard platinum resistance thermometers of record when reading difference≤0.05 of two standard platinum resistance thermometers ℃, adopts described symmetrical observation method to carry out reading again.In the experiment specific to present embodiment, one ton of water is arranged approximately in the constant temperature water bath apparatus, can heat by adding hot water storgae 4 in the water inlet process.After water inlet finishes, and intensification is stable, need carry out the temperature error experiment, test again after about two hours.We observe by experiment temperature stable after, variation in two hours such as following table (unit ℃):
| Time (min) | 30 | 60 | 90 | 120 |
| Standard platinum resistance thermometer 1 (℃) | 27.769 | 27.772 | 27.770 | 27.770 |
| Standard platinum resistance thermometer 2 (℃) | 27.800 | 27.801 | 27.792 | 27.800 |
| Variable quantity (℃) | 0.031 | 0.029 | 0.022 | 0.030 |
From last table data as can be seen, the variable quantity of temperature field satisfies and detects requirement less than 0.05 ℃.
In testing process, be also noted that the temperature-sensing element of thermometer should insert in the water-bath chamber 2 fully, otherwise will produce bigger leakage, cause measuring error; When making comparisons calibrating, the temperature in the groove may produce slowly and change, and in order to eliminate standard and the inconsistent influence of tested thermal resistance time constant, the variable quantity of temperature field is the smaller the better; In addition, in order to eliminate the influence of reading at one time of standard and tested thermal resistance, must read the data of standard and each inspection thermal resistance successively in strict accordance with the principle of symmetrical observation method.
Must not be less than four circulations when using described symmetrical observation method to read the temperature value of described standard thermometer 1 and long-rod platinum resistance thermometer 3 to be measured successively, and get its mean value as temperature value.Concrete, each circulation can be measured the resistance value of standard platinum resistance thermometer and tested thermal resistance in the following order, be standard platinum resistance thermometer → tested 1 → tested 2 → ... → tested n, commutation again, tested n → ... → tested 2 → tested 1 → standard long-rod platinum resistance thermometer.
The repeatability of measurement result is calculated as follows:
In the formula: xi is the single measurement result;
Be the mean value of measurement result repeatedly; N is for measuring number of times.The repeatability of calculating measurement result mainly is the short-term repeatability meter characteristic that is used to evaluate the long-rod platinum resistance thermometer.
When the data of noting are handled, the relational expression of application of temperature and resistance: R (t)=R (0 ℃) * (1+At+Bt
2), earlier according to the standard platinum resistance thermometer calibration certificate provide A, the B coefficient calculations goes out average temperature value, with it as the standard temperature value.And then go out the average resistance and the temperature value of every long-rod platinum resistance thermometer according to the A in the normalized form, B constant calculations.Because what detected long-rod platinum resistance was measured is resistance value, and the funtcional relationship between resistance value and the temperature is R (t)=R (0 ℃) * (1+At+Bt
2), the field engineering personnel only need be according to the corresponding with it temperature value of resistance value, and the evaluation of the meter characteristic of this batch thermometer is screened, and can select that deviation is little, the long-rod platinum resistance thermometer of good reproducibility.
This pick-up unit has solved for many years that the long-rod platinum resistance thermometer must send external detection, and the expense peace is high, the problem that enterprise is difficult to bear.Adopt this pick-up unit to detect, can save the check fee of hundreds of thousands unit every year.And can guarantee for the scene provides measurement data accurately, guaranteed the accuracy that the condensator outlet ocean temperature is measured, make correct assessment for the safe condition of condenser and Steam Turbine reliable foundation is provided.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. the pick-up unit of a long-rod platinum resistance thermometer, it is characterized in that: it comprises a constant temperature water bath apparatus and at least two standard thermometers, described constant temperature water bath apparatus comprises that again one can insert the water-bath chamber of long-rod platinum resistance thermometer to be measured, described two standard thermometers also insert the two ends of this water-bath chamber respectively, described water-bath chamber tilts to place horizontal by angle, described water-bath also is provided with a vent valve on the chamber, and described vent valve is arranged on the higher end in position, described water-bath chamber.
2. the pick-up unit of long-rod platinum resistance thermometer according to claim 1 is characterized in that: the angle that described water-bath chamber is become with surface level is 10～15 degree.
3. the pick-up unit of long-rod platinum resistance thermometer according to claim 1, it is characterized in that: described constant temperature water bath apparatus comprises that also a hot water storgae and that adds that has temperature regulating device adds the water pump that hot water storgae is connected with this, and this water pump and temperature regulating device all are connected with described water-bath chamber.
4. the pick-up unit of long-rod platinum resistance thermometer according to claim 1 is characterized in that: described standard temperature is counted second-class standard platinum resistance thermometer.
5. the pick-up unit of long-rod platinum resistance thermometer according to claim 1 is characterized in that: this pick-up unit comprises that also one can gather the processor that standard temperature is taken into account long-rod platinum resistance thermometer temperature value to be measured.
6. according to the pick-up unit of each described long-rod platinum resistance thermometer in the claim 1 to 5, it is characterized in that: the length of described long-rod platinum resistance thermometer is 1950mm～2250mm.
7. the pick-up unit of long-rod platinum resistance thermometer according to claim 1 is characterized in that: the length of described water-bath chamber is 2 meters.
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| CN2007101256091A CN101319940B (en) | 2007-12-28 | 2007-12-28 | Test device and use method of long-rod platinum resistance thermometer |
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| CN2007101256091A CN101319940B (en) | 2007-12-28 | 2007-12-28 | Test device and use method of long-rod platinum resistance thermometer |
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| CN101319940A CN101319940A (en) | 2008-12-10 |
| CN101319940B true CN101319940B (en) | 2011-10-05 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104089718B (en) * | 2014-07-25 | 2017-07-25 | 上海华力微电子有限公司 | Constant temperature testing system and temperature monitoring method |
| CN105962905B (en) * | 2016-05-17 | 2019-03-05 | 杭州欧汇科技有限公司 | Electronic thermometer and temp measuring method based on it |
| CN105942988B (en) * | 2016-05-17 | 2019-03-05 | 杭州欧汇科技有限公司 | Electronic thermometer and calibration method based on it |
| US11226243B2 (en) * | 2017-08-01 | 2022-01-18 | Try and E Co., Ltd. | Method of calibrating temperature sensor |
| CN107976265A (en) * | 2017-11-27 | 2018-05-01 | 天津航空机电有限公司 | A kind of time constant test system and method for temperature sensor |
| CN108827499A (en) * | 2018-07-30 | 2018-11-16 | 江苏方天电力技术有限公司 | A kind of temperature standard device of smokeless environment-friendly |
| CN111207856B (en) * | 2019-12-27 | 2022-11-15 | 广东德诚科教有限公司 | Method, device and equipment for acquiring accuracy of measured temperature and readable storage medium |
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