Measurement and Test Norm of Thermostatic Baths Metrological Characteristics

JJF 1030-1998 Technical Performance Test Specification for Constant Temperature Baths JJF1030-1998 Standard download decompression password: www.bzxz.net
This specification is applicable to testing the temperature fluctuation and temperature distribution uniformity of various types of thermostatic baths for measurement and testing in the range of -100℃~600℃ for newly produced or repaired and in use, so as to determine the technical performance of the thermostatic baths.

National Metrology Technical Specification of the People's Republic of China JJF 1030 -1598
Measurement and Test Norm ofTherrmostatic Bath's MetrologicalCharacteristirs
1998-04-16 Issued
1998-10-01 Implementation
State Administration of Quality and Technical Supervision Issued
JUF 1030—199%
Measurement and Test Norm nfTherrmostaticBath's MetrologicalCharacteristics
JJF1030—1998
Replaces JJG 1030—I
This technical specification was approved by the State Quality and Technical Supervision Bureau on April 16, 1998, and will be implemented on October 1, 1998:
Responsible unit:
Drafting unit:
Beijing Technical Supervision Bureau
Beijing Institute of Reclamation Science
The drafting unit is responsible for interpreting the provisions of this technical standard. The main drafter of this specification:
Peng Tiejun
Participating drafters:
Wei Congmin
Wang Shuzhen
JJF1030 —1998
(Beijing Institute of Measuring Sciences)
(Beijing Institute of Measuring Sciences)
(Beijing Institute of Measuring Sciences)
(Beijing Institute of Measuring Sciences)
(Beijing Institute of Measuring Sciences)
Selection of test temperature points
Determination of work area
Thanks to the test equipment
Test of temperature fluctuation
Test of temperature and humidity uniformity
VI. Processing of test results
JJF 1030 1998
Appendix Notice of constant temperature technical performance test results (back) Format 1)
JJF 103+ —1998
Technical performance test specification of constant temperature pump
This specification is applicable to testing the temperature fluctuation and temperature distribution (hereinafter referred to as temperature average) of various types of measuring instruments within the range of -1 after new production or repair and in use, so as to determine the technical performance of the thermostat.
Selection of test temperature points
1 The test work of temperature fluctuation and temperature uniformity of the constant temperature bath should be carried out at the upper and lower limits of the temperature range of the constant temperature bath.
2 Any temperature point within the working temperature range can also be sampled and tested as needed. Determination of working area
3 The working area refers to the maximum range of the area that the measuring instrument can reach in the constant temperature bath specified in the technical indicators of the constant temperature bath.
4 The commonly used working area of ​​the constant temperature bath is shown in Figure 1. Area ACBDECFH is a cylinder, and its radius is equal to the distance from the center of the plug hole on the constant temperature plug dial to the center of the plug dial. For other constant temperature baths, the upper working area also has a rectangular shape, as shown in Figure 2.
The distance between the top surface 4CBD and the bottom surface EGF1 in Figures 1 and 2 and the upper surface of the constant temperature bath should be determined according to the measuring end of the test.
3. Test equipment
5 Instruments and equipment used to test the performance of thermostat technology. The resolution and short-term stability should be better than 3 times the maximum temperature field index of the thermostat to be tested.
6 Standard platinum resistance thermometer method
61 Two standard chain resistance thermometers (same model). JJE1030—1908
6.2 One measuring bridge. Other electrical measuring equipment with the same accuracy can be used. 3 One resistance thermometer conversion plate.
6.4 One stopwatch:
? Standard mercury thermometer method
7.1 Two standard mercury thermometers (same model). 7.2 One reading meter.
8 It is also possible to use other test instruments that meet the requirements of Article 5 and have the same time constant and temperature fluctuation test as the above-mentioned thermometer.
9 Raise (or lower) the temperature to the upper limit (or lower limit) temperature, and then insert the test thermometer into the working area.
10 After the temperature of the constant temperature bath stabilizes, read the temperature indication at a uniform interval of no less than once per minute for at least 15 minutes. 11 Among the temperature readings, 1/2 of the difference between the maximum value and the minimum value, plus the "" symbol, is the temperature fluctuation of the constant temperature bath.
5. Test of temperature uniformity of temperature field
12 Temperature uniformity of temperature field refers to the temperature difference between any two points in the working area. 13 Test the temperature difference AtAB-AIDAEFCHAtAP and CHO of points AB, CD, FF, CH, AF and I at the positions shown in Figure 2 or Figure 3
13.1 Insert two thermometers m and n vertically into the temperature uniformity field so that the centers of their temperature sensing elements are at points A and B respectively. After the temperature stabilizes, read the indications of the two thermometers and 213.2 respectively. Exchange the positions of the two thermometers, that is, the m thermometer is at point B and the n thermometer is at point A. After the temperature stabilizes, read the indications of the two thermometers and 1 again. Repeat tests 13.1 and 13.2, and read a total of 4 groups of values:
tma,nag EmayInly
13.32 can be obtained by the following formula:
Ata - I (+m, + tn, + +ma, + tua,) -(tmt - tme, + tay + ne,) ] / 43 The same method can be used to easily produce the following results: cn, tcbZxz.net
11 Temperature measurement using thermometer comparison method
14.1 Place the temperature sensing parts of the two thermometers used for testing as close as possible to the working environment. When the temperature in the constant temperature bath is stable, read the indications of the two thermometers 4 times in rotation, take the average value and subtract it from the other, and the system benefit value of the two thermometers can be obtained:
Aram = *m - 1,
5JF 130 - 1998
14.2 Insert the temperature sensor to the two points where the temperature difference is to be measured (such as points A and B2). After the temperature is stable, read the indications of the two thermometers 4 times in rotation, take the average value and subtract it from the other, and then subtract m from the other, and the temperature difference between the two points can be obtained as DtAR = (tm - tn) Atrr
14.3 The same method can be used to test the temperature difference of other items. 15. The temperature between any two points in the working area shall be sampled and the result shall meet the technical requirements. VI. Processing of test results
16. After the test is completed, a test result notice shall be issued (recorded) and it shall be noted that the validity period shall not exceed 2 years. Appendix
JJF1030—1998
Constant temperature technical performance test result notice (back) format The main technical performances of the tested low-temperature mold are as follows Temperature fluctuation:
Lower temperature
Upper temperature
Measurement
Temperature average (T)
Detection temperature point
Constant temperature working medium:
Class hours, ★
Its time,
Working area horizontal
Directional temperature difference
r/15mim
r/15 min
C/15 min
Downward style or different depth of skin
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