This standard specifies the calibration items and technical requirements for oxygen bomb and air bomb aging test chambers, calibration instruments, calibration methods, calibration results and treatment. This standard is applicable to the calibration of the working space of oxygen bomb and air bomb aging test chambers for wires and cables. JB/T 4278.9-1993 Calibration methods for rubber and plastic wire and cable test equipment Oxygen bomb and air bomb aging test chamber JB/T4278.9-1993 Standard download decompression password: www.bzxz.net

ICS29.060
Registration number: 32042—2011
Mechanical Industry Standard of the People's Republic of China
JB/T4278.9—2011
Replaces JB/T4278.9—1993
Verification procedure for test equipment of rubber plastic wire and cable-Part 9: Oxygen bomb, air bomb aging test oven2011-05-18 Issued
2011-08-01 Implementation
Issued by the Ministry of Industry and Information Technology of the People's Republic of ChinaForeword
Normative reference documents.
Verification items and technical requirements
Verification equipment,
Verification method.
Calculation of temperature deviation,||tt| |Calculation of spatial temperature deviation
Calculation of time temperature fluctuation
6.3 Calculation of temperature deviation..
Processing of verification results.
Appendix A (Normative Appendix) Contents and sample of verification certificate
JB/T4278.92011
JB/T4278 "Verification methods for rubber and plastic wire and cable test instruments and equipment" is divided into 19 parts: Part 1: General provisions;
Part 2: Low temperature impact test Device:
Part 3: Flexure test device: Www.bzxZ.net
Part 4: Abrasion test device;
Part 5: Vertical combustion test device for single insulated wire and cable: Natural ventilation heat aging test chamber:
Part 6:
Part 7: Constant temperature water bath;
Part 8: 1
Low temperature test chamber:
Part 9: Oxygen bomb, air bomb aging test chamber: 1 Part 10: Spark test machine; || tt||Part 11: Low temperature winding test machine:
Part 12: High temperature pressure test device: Part 13: Strong pursuit ventilation thermal aging test chamber; Part 14: Fire resistance test device;
Part 15: Bundled combustion test device; Part 16: Smoke density test device:
Part 17: Carbon black content test device: Part 18: Single copper core insulated thin wire and cable vertical combustion test device; Part 19: Insulation scratch resistance tester. This part is Part 9 of JB/T4278.
JB/T4278.9—2011
This part replaces JB/T4278.91993 "Rubber and plastic wire and cable test instrument and equipment verification method Part 9: Oxygen bomb, air bomb aging test chamber".
Compared with JB/T4278.9-1993, the main changes of this part are as follows: the temperature deviation is changed from "shall comply with the wire and cable test method standard" to "shall comply with the temperature deviation provisions in the wire and cable product standard" (3.2 of this edition, 3.1 of 1993 edition); the pressure change in the box shall not exceed the "specified range" of the wire and cable test method standard to "specified ± 5% range" (3.3 of this edition, 3.2 of 1993 edition).
Appendix A of this part is a normative appendix.
This part is proposed by China Machinery Industry Federation. This part is under the jurisdiction of the National Technical Committee for Standardization of Wires and Cables (SAC/TC213). Drafting units of this part: Shanghai Cable Research Institute, Wuxi Yongling Electronic and Electrical Equipment Co., Ltd. Main drafters of this part: Fan Hongxin, Liu Enju, Zhang Weijun. The previous versions of the standard replaced by this part are JB4278.9—1986 and JB/T4278.9—1993. m
1 Scope
Verification methods for rubber and plastic wire and cable test equipment Part 9: Oxygen bomb, air bomb aging test chamber JB/T4278.9—2011
This part of JB/T4278 specifies the verification items and technical requirements, verification instruments, verification methods, verification results and processing of oxygen bomb, air bomb aging test chamber.
This part is applicable to the verification of the working space of oxygen bomb, air bomb aging test chamber for wire and cable. 2 Normative references
The clauses in the following documents become the clauses of this part through reference in this part of JB/T4278. All subsequent amendments (excluding errata) or revisions of referenced documents with an H date are not applicable to this part. However, parties to an agreement based on this part are encouraged to study whether the latest versions of these documents can be used. For referenced documents without an H date, the latest versions apply to this part. JB/T4278.1-2011 Verification methods for rubber and plastic wire and cable test equipment Part 1: General 3 Verification items and technical requirements
3.1 The technical requirements of oxygen bomb and air bomb aging test chambers shall comply with the provisions of JB/T4278.1-2011 in addition to the provisions of this part.
3.2 The temperature deviation of the working space of oxygen bomb and air bomb aging test chambers shall comply with the provisions of temperature deviation in the relevant wire and cable product standards. 3.3 The sealing of the test chamber should be good, and the pressure change in the chamber during the test should not exceed the ±5% range specified in the relevant wire and cable test method standards.
4 Calibration instruments
4.1 Thermocouple group: A thermocouple group is composed of 9 thermocouples made of nickel-chromium-copper-nickel (constantan), nickel-chromium-nickel silicon or other materials with a wire diameter of 0.5mm and a node diameter of not more than 2.0mm. The 9 thermocouples should be composed of wires of the same spool so that the difference in thermoelectric potential between them when converted into a temperature difference below 200℃ is not more than 0.2℃. 4.2 DC digital voltmeter: The actual measurement deviation is less than 0.05%. When using nickel-chromium-copper-nickel (copper) thermocouples, the resolution of the digital voltmeter is not less than 10μV; when using other thermocouples, the resolution of the digital voltmeter is not less than 1μV. 4.3 Thermocouple conversion switch.
4.4 Stopwatch: The division value is 0.1s.
5 Calibration method
5.1 The working space is called the measured space during the calibration process. The cylindrical measured space with a height of not less than 150mm and a diameter slightly smaller than the diameter of the cylindrical test box should be located at the specimen placement position in the box. 5.2 Use 9 thermocouples to measure the temperature of 9 measuring points in the measured space, 1 measuring point is the center point of the cylindrical measured space, and the remaining 8 measuring points are distributed on the two end faces of the cylindrical measured space. On the circumference of each end face, there are 4 measuring point thermocouples evenly divided, and the length of the thermocouple at each measuring point in the test box is not less than 300mm. 5.3 Use suitable materials to seal the outlet of the measuring thermocouple of the test box to minimize the exchange of heat in the test box with the outside world. Adjust the temperature of the test box so that the temperature of the test box does not deviate from the required temperature of the test by ±2°C. 5.4 Start measuring 1 hour after the test box reaches thermal stability, and quickly record the thermoelectric potential of the thermocouples at the 9 measuring points. Measure 1JB/T4278.92011
times every 5 minutes (0th minute, 5th minute, 10th minute, 15th minute, 20th minute), and complete 5 measurements. 5.5 Test according to the temperature and pressure specified in the relevant wire and cable product standards and wire and cable test method standards, and check whether the pressure change of the test chamber within 2 hours during the test meets the requirements of 3.3. 6 Calculate temperature deviation
6.1 Calculate spatial temperature deviation
Calculate the average value of each incandescent potential of the 5 measurement values ​​of the 9 measuring points respectively, and convert it to the average temperature of each measuring point by looking up the graduation table. Taking the average temperature of the center point of the measured space as the reference, calculate the spatial temperature deviation between the average temperature of each measuring point and the average temperature of the center point according to formula (1) (accurate to 0.1°C):
Where:
a——the spatial temperature deviation of the ith vertex of the measured space (1-8), in degrees Celsius (°C); T is the average temperature of the ith vertex of the measured space (|-8), in degrees Celsius (°C): T. —the average temperature of the center point of the measured space, in degrees Celsius (°C). 6.2 Calculation of time temperature fluctuation
Calculate the difference between the highest temperature and the lowest temperature of each of the 8 vertices in the measured space in 5 measurements according to formula (2), and get the time temperature fluctuation of the measured space (accurate to 0.1℃):
b=banax=bamin
Where:
The time temperature fluctuation of the first vertex (=1～8), in degrees Celsius (℃); bimax
The highest temperature of the first vertex (=1～8), in degrees Celsius (℃): - The lowest temperature of the first vertex (=1～8), in degrees Celsius (℃). bmin
6.3 Calculation of temperature deviation
The temperature deviation is composed of the spatial temperature deviation and the time temperature fluctuation. The temperature deviation is calculated according to formula (3) (accurate to 0.1℃): A,=a,
Wherein:
The temperature deviation of the ith vertex (=1～8), in degrees Celsius (℃): AT
The spatial temperature deviation of the ith vertex (1～8), in degrees Celsius (℃) a,
b—The time temperature fluctuation of the ith vertex (1～8), in degrees Celsius (℃). 7 Processing of verification results
7.1 Check the calculation results of 6.3 (keep 1 significant figure). If the maximum temperature deviation meets the requirements of 3.2, the measured area is the working space.
7.2 This verification method does not include the verification of the test chamber test temperature indicator (or thermometer) and the pressure indicator. The deviation between the indicated value of the temperature indicator and the actual temperature at the center of the working space at the verification temperature should be given in the verification results. 7.3 A verification certificate shall be issued to the test chambers that have passed the verification, and a verification result notice shall be issued to the unqualified ones. The certificate shall indicate the measuring temperature and the location and range of the working space. The content and format of the verification certificate shall be in accordance with Appendix A. 7.4 The verification cycle of oxygen bomb and air bomb aging test chambers is generally set at 2 years. 2
Test temperature
Temperature deviation
Note: Test chamber dimensions (diameter × height) (mm): Appendix A
(Normative Appendix)
Verification certificate content and format
Verification results
Test status
Distance of working area from inner peak
Working space dimensions (diameter × height) (mm): Next
JB/T4278.92011
Test results
Temperature deviation
People's Republic of China
Mechanical Industry Standard
Verification Methods for Rubber and Plastic Wire and Cable Test Instruments Part 9: Oxygen Bomb and Air Bomb Aging Test Chamber JB/T4278.9—2011
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