Some standard content:
ICS231c0
Machinery Industry Standard of the People's Republic of China
JB/T100742004
Generation 3 Office 100741999
Resistance Vacuum Gauge
Technical Conditions
Specifics of resistance vacuum gauge2004-03-12Release
Implementation on 2004-08-01
Statement issued by the National Development and Reform Commission of the People's Republic of China
Normative Use Documents..
? Terms and definitions
1 Technical requirements.
Technical requirements of the specification
4.3 Requirements for the whole machine
Testing room method
Test method during specification
Test circuit and operation
Complete machine inspection
Inspection
Factory inspection
Type or method,
Marking, decoration, consultation and labeling
Product delivery! 7.4 Technical documents to be carried along with the test sheet, inspection and verification requirements [B/T 10074-2004 I7110074-2004] This standard replaces IT10071999 standard installation technical conditions 3: The main technical indicators are formulated with reference to JIF1050-996 Beijing air calibration regulations and the calibration requirements proposed by domestic manufacturers. This standard is jointly funded by Shanghai Press Industry Association and Shanghai Dynamic Cut-off Technology Research Institute, Chengdu Ruipu Electric Receiver Company, or Chengdu Zhenghua Electric Receiver Company, Shanghai Zhongjing Measurement Technology Research Institute, Shanghai Vacuum Society. Who is the spokesperson: Qinghua. Reduce health, rate of national certificate, fraud red, bacteria over two. The revised version of the standard is 2BY248-1984, JB/TI0074-1999.1 standard pot
resistance vacuum gauge
technical conditions
JHrT100742C04
This standard stipulates the following content: vacuum gauge; for technical requirements, force test method, inspection rules, etc., this point vacuum gauge is from the Beijing academic regulation transfer ear training road drive. 4 marked for [key standard: 10'P0\Pu of the space? Normative references
The following documents are used for the reference of this standard and the skin is the energy clause of this pool. The old note of the referenced document, all subsequent modifications About "excluding errors as abandoned or revised version is not applicable to this standard, however, the kitchen is encouraged to use this document as the new version according to the non-standard consumption or coordination of the parties concerned: H is not the import period for the introduction of market documents, the latest version of the small application standard G1 package storage and transportation indication standard (GB192000, SO780: 1997) CB/4982 British vacuum fast flange G/T4932-1985, idt1802861-1: 1974 GB/T6SR?.2 Electronic measuring instrument temperature test G58?3 for measuring instrument temperature retest
GRT13306 long
JB door 932 throw instrument indication transportation, transportation storage quantity six printing Conditions and test methods JJF1050: Working heat transfer: Vacuum gauge calibration specification 3 Terms and definitions Y
Multiple codes and definitions are used in this standard.
Vacuum gauge
A kind of thermal conductivity that changes with the heat effect during heating. 3.2
Vacuum gauge tube vacumqaugetuhe
A part of a vacuum gauge, containing a hot wire that changes with temperature and is directly connected to the vacuum system. 3.3
Vacuum gauge circuit
It is a part of a vacuum gauge. It consists of a vacuum gauge control unit and a true gauge indication unit. 4 Technical requirements
4.1 Technical requirements for regulation
4.11 The reduced pipe should be able to operate normally under the following environmental conditions: a. Ambient temperature: 40°C:
h) not more than 80°C.
4.1.2 External: There are many cracks, rust spots or obvious gas lines, gas grooves and other blocks in the existing pipes. 4.1.3 Existing values: The value of the hot wire in the cold state should not exceed 3.2%. 4.1.4 The near part of the regulation pipe should meet the following requirements. 4.1.4.1 When the regulation pipe is divided into two types of pipelines, the outer diameter of the pipeline should be 15.51mm105mm1:JB/r 10074~-2004
4.1.4.2 The current tube connection part is a fire-tight and fast-breaking method. The technical requirements should meet the GH4V ratio. 4.1.5 Sealing Note: The fullness of the tube to the gas is not greater than 10*P-%. 4.1.6 The insulation between the system and the metal casing is not guaranteed to be 241.7 Under the rated ambient temperature of 23+3, the deviation from the standard line when the bottle is calibrated by the line is 0.51a25KP. The average value is not guaranteed to exceed 25%.
4.2 Technical requirements for vacuum gauge circuits
4.2.1 The vacuum gauge should be able to work normally under the following environmental conditions and power supply: a) Ambient temperature: D%~40:
: Relative excitation: not more than 80% (25 hours! c: Power supply: 220V±22V: Frequency 50Hz1D.SHz.4.2.2 Appearance of vacuum meter
: vacuum meter is of good quality and surface treatment, and the text and symbols of the signs are clear: b! The display should not have external defects that cause measurement errors, such as the analog interface cannot be adjusted, the digital display should have no missing segments, missing characters, etc. c: The switches, buttons, indicator lights, etc. of the vacuum meter should be complete and intact, and all parts should not be loose. 4.3 Technical requirements for vacuum meter
4.3.1 When the vacuum meter is used with a voltage of 220V+22V, the injector should be preheated for half an hour and adjusted, and then the vacuum meter should be used at a power supply voltage of 2220V+22V. The relative difference of the indication value should not exceed 50% within 0.5Pa~2500Fa in the pressure measurement. 5.1 Test method for compliance with regulations 5.1.1 The requirements of 1 shall be followed in accordance with the relevant provisions of GB/T 65872 and B/T 6587.3. 5.1.2 Whether the requirements of 4.1.2 are met shall be checked by using the same or similar test method. 5.1.3 The heat dissipation of the cooling fan shall be measured by the power method. When measuring A, the maximum heating current shall be 1% of the minimum current when measuring A. See Figure A for the test results. Figure A: Standard electrical insulation! , the accuracy of the test is -0.5%, and the selected inductive group is 2 times the standard cut-off current. The resistance change of each part does not exceed 2%R, which can be caused by the problem or large. For the ratio, the 2:0k20k customer diagram positioner
light spot galvanometer:
increase the accuracy of the research 0.2% direct-following controlled voltage power supply: its value is 2V: mA-standard. It is a level 1 DC milliammeter
3R /10074—2004
Geometry method: Under standard conditions (23°C, 3°C, sensitivity not greater than 80%), and without heat source, air convection and vibration, install the filter in the specified position according to the regulations: When the external circuit is connected in series with the resistor, the bridge resistor is left, and the R value is read by the resistance box. The cold value should meet the requirements of 41.3 of this standard. Refer to the relevant provisions of JJIF1050 for inspection.
5.1.4 Specified connection parts are inspected by observation or 0BT4982. 5.1.4.1 Diameter inspection of the pipe connection: refers to the part less than 3Wmm from the mouth. The calibration caliper inspection should meet the requirements of 4.1.4.1.
5.1.4.2 Inspection should be carried out by the corresponding measuring tool, which should meet the requirements of GB/ The technical requirements for the reverse connection part in T4982. 5.1.5 regulation is the requirement of 4.t.5. The reverse connection should be carried out at a sensitivity of not less than (5×190)1Pa·ms or the quality standard should be met. The continuous positive voltage between the output line and the metal outer should be checked with a 50(V cross-relay resistance meter. It should meet the requirements of 4.1.6 of this standard. 5.1.7 adopts a constant pressure type.The calibration of the measuring tube is carried out in accordance with the circuit, and the uncertainty of the calibration system is calculated to be no more than 10%. Try to change the gas level to nitrogen, and calculate the relative uncertainty of the single tube calibration line, as calculated by formula (1) and formula (2): in
pressure value:
pressure resistance value:
deviation value of the single calibration curve point to the standard curve: 4
average value of the pressure difference between the pressure gauge and the selected point:
number of measurements at the selected point.
zero acceptability test point selection, there should be no less than 5 points within the measurement range. Among them, 1 point is selected at each end and 3 points are selected in the middle. After the above test and calculation, the average value of the energy deviation of each point should meet the requirements of 4.1.7 of this standard. 5.2 Test method of vacuum gauge circuit Www.bzxZ.net
Check whether the vacuum gauge circuit meets the requirements of 4.2.1 by referring to the relevant provisions of GB/T6587.2 and B/T6557.3. 5.2.1
5.2.2 Check whether the vacuum gauge circuit meets the requirements of 4.2.2 by using the method of monthly measurement or phase point measurement. 5.3 Test of whole machine
5.3.1 Check the positive measurement range of the vacuum gauge on the calibration system. 53.2 In fact, the circuit and the induction tube are equipped, and the characteristic line method is used to measure the pressure within the range! Select points between the upper and lower limits, each number shall not be less than 3 points, and each point shall be measured repeatedly for not less than 3 times. Take the half mean value to calculate the relative error of the indication, and the relative error of the indication shall be verified to meet the requirements of 4.3.1 of this standard: select 1 to 2 points from the inspection points for 1 hour drift correction and power supply voltage change test, and the result shall meet the requirements of 43.1 of this standard. 6 Inspection rules
The vacuum gauge's ！ ！ inspection and open test items shall be in accordance with the provisions of Table 1 6.15
Factory inspection
The product shall be qualified after all inspection items. And with product certificate: before leaving the factory JH/10074—2004
Vacuum gauge Fenglu
Note: A round card is the required item,
6.2 Type test
Table 1 Inspection items, inspection methods and requirements
In the case of production, the real printing type test is carried out: Type test
a! Trial and determination of new products or old products for production, technical requirements and policies
b) When there are major changes in the design, technology or materials of the product that may affect the product performance: When the production is suspended for more than one year and the production is resumed
When the national quality inspection agency proposes the requirement for type testing: 7 Marking, packaging, transportation and storage
7.1 Label
Long-term inspection terms
Each vacuum gauge has a fixed label on the bottom. Its dimensions shall comply with the provisions of GB/113306, and the following contents shall be marked: a) Manufacturer name:
b) Product model and name
c) Rated voltage:
Year and production number.
7.2 Packaging
7.2.1 The packaging method shall ensure that the product will not be damaged in normal transportation: When leaving the factory: It shall be dust-proof, clean, moisture-proof, and mildew-proof.
7.2.2 The appearance of the packaging box shall include: product model, name, quantity, handle with care, moisture-proof, shipping address, delivery order and address, and the packaging storage and transportation graphic mark shall be correctly selected according to G191. 7.3 Technical documents that should be brought along with the product
731 The content of the product certificate is:
a) Product model and name:
b) Inspection conclusion:
Inspection period:
Inspection period:
The content of the product manual is
Main technical parameters, "operating principle, performance characteristics, use method b) Reverse connection:
) Installation instructions.
7.3.3 Packing list
7.4 Transportation
The real variable meter should meet the requirements of the door 932 type when transporting and packing. The transportation process should be stopped, corrected and returned. 7.5 Storage
The storage point should be in accordance with the requirements specified in JB19329.
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