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Bimetal Thermometer - Bi-metal thermometer measuring principle and application of technology Time :2009-07-2 |
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¡¡Source: thermometer, Milk thermometer, Soil thermometer - Ningbo Yinzhou Hongxiang thermometer factory
1 The content and application of the theme
The standard industrial bimetal thermometer (hereinafter referred to as a thermometer) and the definition of terms, product classifications, technical requirements, test methods, inspection rules, signs and packaging.
This standard applies to the bi-metallic components and the temperature detection element component jacket with a circular plate scale, as well as the measurement range of -80 ~ +500 ¡æ thermometer.
2 reference standards
Instrumentation ZBY 002 transport, the basic environmental conditions of transport and storage of test methods
Packaging Technology Instrumentation Instrumentation ZBY003 conditions
Industrial Automation Instrumentation ZBY120 working conditions - temperature, humidity and atmospheric pressure
Industrial Automation Instrumentation ZBY122 instruction pointer part of the basic type, size and general technical requirements of indicator
ZBY123 scale industrial automation instrument of general provisions
Terms of industrial automation instruments ZBY247
3 Terms and definitions
In addition to the standard ZB Y247, there are the following terms and definitions apply to this standard.
3.1 Axis-angle detection devices and vertical scaling of the flat plate type, also known as the axial type.
3.2 Detection of components straight axis and scale parallel flat plate type, also known as radial-type.
Insert length of 3.3 from the bottom to the installation of detection devices or taper thread joints connecting the lower end of the length (see Appendix A Fig A1 ~ A4 in L).
3.4 into the bottom of the length of run from the detection of components, testing components in the length of the measured medium.
4 product classification and the basic parameters
4.1 Type
Thermometer device according to the instructions to install and test different ways to connect components is divided into the following four types;
a radial
b Axial
c Wanxiang
d. angle
1988-06-12 machinery and electronics industry to implement the approval of -------- 1989-01-01
4.2 disk scale nominal diameter
Thermometer scale nominal diameter disk 60,100,1500 mm
4.3 Measuring Range
Thermometer measuring range should be consistent with the provisions of Table 1.
Table 1
Measuring range
-80 ~ +40
-40 ~ +80
0 ~ 50
0 ~ 100
0 ~ 150
0 ~ 200
0 ~ 300
0 ~ 400
0 ~ 500
4.4 accuracy level
Thermometer rating for the accuracy of 1,1.5, (2.5)
Note: Figures in brackets denote the accuracy level is not recommended.
4.5 Detection of components and installation of screw diameter
Detection of components and installation of screw diameter should be in accordance with the provisions of Table 2.
Scaling Nominal diameter disk detection devices installed in diameter thread
60 4,6 M 16 ¡Á 1.5
100,150 8,10 M27 ¡Á 2
Insert length of 4.6
Insertion length of the thermometer 75,100,150,200,250,300,400,500 mm.
Note: Insert a length of more than 500mm from the factory and agreed with.
Nominal pressure of 4.7 jacket
Nominal pressure of the thermometer sheath 1.0,1.6,2.5,4.0,6.4 MPa series should be selected.
4.8 installation connections
The installation of the thermometer connections are divided into the following four (see Appendix A);
a. adjustable fittings;
b. pipe connection (outside thread);
c. pipe connection (internal thread);
d. fixed thread.
4.9 instructions to adjust body
Thermometer device according to the instructions to adjust the availability of instructions is divided into the following three institutions:
a. no instructions to adjust institutions;
b. instructions to adjust the external institutions;
c. adjustment of internal instructions institutions.
5 Technical Requirements
5.1 Normal working conditions
Normal working conditions of the thermometer should be in accordance with the provisions of Table 3.
Table 3
Workplace temperature ¡æ relative humidity%
Place masking -25 ~ +55 5 ~ 100
Outdoor venues -40 ~ +85 5 ~ 100
Note: The special conditions of work agreed by the manufacturer and user.
5.2 appearance, structure and assembly quality
The appearance of the thermometer, the quality of the structure and assembly shall meet the following requirements:
a. thermometer may not have the parts rust, protective layer should be a solid, uniform and smooth;
b. the surface of the glass thermometer, or other transparent material should be transparent, should not impede the correct reading deficiencies;
c. the type of thermometer, the basic parameters and dimensions (dimensional tolerances in accordance with the relevant provisions of factories) should be in accordance with the provisions of Chapter 4;
d. thermometer pointer and scale of the disk should be in accordance with the provisions of ZBY122 and ZBY123; pointer length (pointer to the instructions of the Rotary Center for cutting-edge length) should be in accordance with the provisions of Table 4; pointer instructions scaling part of the distance between flat plate should not in 5mm; circular scale of 270 ¡ã ~ 300 ¡ã circular part; indicators and plate-scale calibration and signs should not change color and fade.
Table IV
Disk scale length of the nominal diameter of target
60 ¡Ý 23
100 ¡Ý 36
150 ¡Ý 57
5.3 Basic error limit
Limited to the basic error of the thermometer should be in accordance with the provisions of Table 5.
Table V
Basic accuracy 1.0% measurement error of ¡À 1.0 1.5 range of ¡À 1.5 (2.5) range of ¡À 2.5
5.4 Backlash
Back to the thermometer should not be worse than the absolute value of the basic error limit.
5.5 Repeatability
Repeatability of the thermometer should be a basic error of not more than one-half of absolute limit.
5.6 Thermal Stability
Thermometer in the measurement of the detection devices to maintain the upper limit provided in table 6 of time, should comply with the requirements of 5.3.
Table 6
Hold time measurement of the upper limit h ¡æ
¡Ü 300 24
40,012
500 4
Time constant 5.7
Time constant of the thermometer should be not more than 40s.
Vibration resistance of 5.8
Thermometer should be able to withstand a frequency of 25Hz, the displacement amplitude for the 0.6mm, the vibration waveform is sine wave, for a total of 24h vibration resistance test. Test, thirst meter should be in line with the provisions of 5.3, and no mechanical damage.
5.9 the location of the impact of
Thermometer from the reference location of the work forward, the left and right 90 ¡ã tilt caused by changes in the indication should be limited to not more than the absolute value of the basic error.
5.10 Pressure
Sheath of the thermometer should be able to withstand 1.5 times the nominal pressure of the pressure test, there is no damage and leakage.
5.11 Transport, transport storage of basic environmental conditions
Thermometer with factory packaging should be able to withstand high temperatures provides ZBY002 by (+55 ¡æ), low temperature (-40 ¡æ), for the impact (acceleration: 98m/s2, pulse duration: 11ms) and free fall (height: 250mm) pilot . Test 5.2,5.3,5.4 and 5.5 should comply with the provisions of Article.
6 Test method
6.1 appearance, structure and assembly quality inspection
In accordance with the requirements of 5.2 found with head and check the appropriate tools.
6.2 Basic error limits
6.2.1 Test conditions
a. environmental temperature of 15 ~ 35 ¡æ, relative humidity 45% ~ 75%, atmospheric pressure of 86kPa ~ 106kPa;
b. the length of the thermometer should be placed in line with the product specification requirements;
c. shock and vibration-free Britain.
6.2.2 Meter test equipment and standards
Test equipment for the thermostat bath, the standard instrument for the standard thermometer. Thermostat bath temperature measurement, the measurement methods used by the limits of error should be not more than the basic error of the thermometer has been limited examination of a quarter.
6.2.3 Test points
Each test point the thermometer should not be less than 4 months, and should be evenly distributed within the scope of the measurement scale long-line (including the measurement of the upper limit, lower limit and 0 ¡æ).
6.2.4 Test requirements
Thermometer will be the detection of test components and standard plug in the thermostat bath thermometer, thermostat bath temperature should be stabilized at test temperature provided by the standard thermometer readings, and then read by the indications of a thermometer test.
Were tested with the standard thermometer thermometer indication of the margin, the thermometer is in the basic error of test points.
Along the journey should be both positive and negative points in the trial of the test at least once, the results of each test should be in accordance with the provisions of 5.3.
Backlash 6.3 Test
Back to test the use of poor and basic error limits the same test conditions, test equipment, standard instrumentation, test points (in addition to being outside the upper and lower limits of measurements) and methods, and basic error limits at the same time. Point in each experiment, anti-stroke margin of the indication, the backlash is the thermometer, it should be in accordance with the provisions of 5.4.
6.4 Repeatability test
Repeatability tests using the same basic error limits of the test conditions, test equipment, standards, instrumentation and test points. Should be along the same itinerary (positive or anti-trip itinerary) in each test point to read at least three times that value. Along the same journey from pilot sites in each indication is the maximum difference between the reproducibility of the thermometer, it should be in accordance with the provisions of 5.5. At the same time, should comply with the provisions of Article 5.3,5.4.
6.5 Thermal stability test
Insert the thermometer temperature detection device components, in the measurement of the ceiling to keep the time requirements in table 6. Test, the thermometer temperature devices shall be of not more than ¡À 2 ¡æ. Test, the thermometer should be in line with the provisions of 5.6.
6.6 Time Constant Test
Thermometer is the detection of components in the medium low temperature until a stable indication to another quickly in a high temperature into the tank thermostat (formerly a medium temperature and the temperature thermostat bath thermometer range is greater than the difference between the 50 %, to form a temperature step), start the stopwatch at the same time, when the thermometer reached that the changes in the value of the difference between the temperature (step value) of 63.2%, the embedded stopwatch stops. Stopwatch time a note of the time constant is that it should be in accordance with the provisions of 5.7.
6.7 Vibration resistance test
Will be installed on the vibration platform thermometer. Thermometer calibration plate should be parallel with the acceleration due to gravity. 5.8 and then stood in line with the provisions of the direction of the vertical vibration.
6.8 the location of the impact test
Will be at room temperature the thermometer under the conditions of work from the reference position of the front and rear, left and right of the tilt 90 ¡ã, and then measuring the resulting changes in that value.
6.9 Pressure Test
Sheath voltage withstand test of thermometer should be at room temperature for external pressure water test, test pressure 1.5 times the nominal pressure, test time of 1min. Test process, the jacket should not be damaged and leakage.
6.10 Transport, transport storage test of basic environmental conditions
Will take the thermometer factory packaging ZBY002 and 5.11 according to the provisions of high-temperature, low temperature, continuous and free drop test impact.
7 Inspection rules
7.1 factory inspection
Each thermometer should be in accordance with the requirements of Article 5.2,5.3 and 6.1,6.2 methods of the factory test pilot. By the factory in order to check the thermometer factory, and should be accompanied by a certificate.
7.2 Inspection
Thermometer, one of the following circumstances, type of inspection should be carried out:
a. trial of new products or old products to factory production;
b. post-production, such as structure, materials, technology changes more likely when the impact of product performance;
c. normal production, the regular or the accumulation of certain post-production, an inspection should be cyclical;
d. long-term production products, the resumption of production;
e. the factory test results with the previous pattern of large differences between the test;
f. Quality Supervision, inspection agencies to carry out the request form.
8 logo, packaging
8.1 marks
Thermometer calibration disk should have the following signs:
a. Standard factory or factory;
b. Product Name;
c. Model;
d. unit of measurement symbols "¡æ";
e. level of accuracy;
f. products and manufacturing date code.
8.2 Packaging
Thermometer should be in line with the packaging requirements ZBY003. |
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