Some standard content:
ECS17.100
Machinery Industry Standard of the People's Republic of China
JB/T 9276-1999
Inclined-tube micro-tmarometer
Inclined-tube micro-tmarometer1999-08-D6 Issued
National Machinery Industry Bureau
2000-01-01Implementation
JB/T 9276-·1999
This standard is a revision of ZBN11018-80 Inclined-tube micro-tmarometer. The revision has revised the original specification and made some changes to the technical content. The appendix of this standard is the attachment of the standard. This standard replaces ZBN11018-89 from the month of implementation. This standard is issued by Xi'an Industrial Automation Instrumentation Research Institute. The responsible drafter of this standard is Xi'an Industrial Automation Instrumentation Research Institute. The main drafters are: Chu, Yue, Zhu. 1 Scope
Machinery Industry Standard of the People's Republic of China www.bzxz.net
Inclined Micromanometer
Incltned tube micromanometer J Sichuan T9276-1399
Code ZB1101889
This standard specifies the product classification, technical requirements, test methods, inspection rules, marking, packaging and storage of inclined micromanometers. This standard refers to the inclined micromanometer used to measure the differential pressure and differential pressure of gases insoluble in ethanol [hereinafter referred to as table 2 Referenced Standards
The provisions contained in the following standards constitute the text of this standard by reference in this standard. When this standard was published, the versions shown were effective. All standards will be revised, and all parties using the standards should explore the possibility of using the latest version of the standard. GB/T679-1980 Chemical test 95% B
CB/T 1146-1989
Water standard
CB/T15464-1995 General technical requirements for packaging of recovery instruments JB/T9329-1999
3 Product classification
Instrument equipment, transportation, storage and testing methods 3.1 The installation form of the instrument is divided into: wall-mounted; desktop. 3.2 The instrument is divided into: fixed tilt angle type; adjustable tilt fish type according to the angle of the surface. 3.3 Meters are divided into:
Meters with meter as unit:
1) Meters with Pa (Pu) as unit, only applicable to 1. and 1.5 Meter accuracy: Pa () as unit, the starting value of acceleration should be "=9.9m, 5-, so that the speed value can be checked without checking the accuracy of the display sequence.
3.4 The accuracy level of the instrument is divided into: 0.5, 1.0, 1.5. 3.5 Instrument accuracy
a Meter with working medium density in the nominal value, the value should be stored in the following number system: 0.2, 0.3, 0.4, 0.6 ,0.8; 5) The dip band number of the double meter is only m green, and its value should comply with the F series number system: 7m25°917, 18°49°23°47. 3.6 The working medium of the meter is 95% ethanol as specified in GI/T69. 4.1 Positive working environment temperature The positive working environment temperature of the meter should comply with the provisions of Table 1. Approved by the State Machinery Industry Bureau on August 6, 1889 and implemented on January 1, 2000 4.2 Standard temperature The standard temperature of the precision meter has been changed to 20°C. 4.3 Basic error JB/T 8276—1969
The basic six errors of the instrument are expressed as reference errors, and their values shall be consistent with the provisions of Table 2. Table 2
4.4 Repeatability
The repeatability of the indication of the instrument shall not exceed 1/24 of the absolute value of the basic error limit.5 Performance
Working environment range
15 - 25
10 -30
5 - 35
To the design limit (in terms of the effectiveness of the quantity)
The instrument shall be able to withstand the sealing test for 10 minutes at the maximum working pressure, and the pressure shall not drop by more than 4. 6 Compression strength
The instrument should be able to withstand a compression strength test of 1.5 times the maximum working pressure for 5 minutes, without damage or leakage. 4.7
The glass tube should be smooth and transparent, and should not have defects that affect the strength and reading. 4.B Scale
The instrument should be evenly spaced, and the scale lines should be divided into three types: long, medium and short. The distance should not exceed 1/5 of the distance between the small grids, and should be perpendicular to the center line of the measuring ball.
The scale lines and digital dials are clearly indicated, and the level should be accurate.
4.9 Adjustment
The instrument should have a seasonal adjustment, and its adjustable range should not be less than ±3% of the scale length. 4.10 Level
The instrument should have a level and a water adjustment device. The level The instrument should comply with the provisions of CB/11% below. 4.11 Reading device for whole scale
The instrument of level 0.5 should have a cross-scale reading device, and should be able to connect smoothly and effectively, and should not have any jamming, jumping or looseness. 4.12 The outer surface of the instrument should be beautiful, the protective layer should be firm and smooth, and there should be no defects such as delamination and corrosion. 4.13 Environmental performance
The instrument should be able to withstand high temperature, low temperature, continuous impact and drop tests specified in JR/T9329. The parameters are as follows: temperature: 55C, low temperature: -40T
Drop height: 100mm;
After the test, the instrument should meet the provisions of 4.3~4.5. 2
5 Test method
JB/T9276--1989
The test procedure of the meter shall be in accordance with Appendix A (Appendix to the standard). 5.1 Test conditions
The basic error and return tests of the meter shall be carried out under the following conditions. 5.1.1 The meter shall be in a horizontal working position. 5.1.2 The ambient environment is free from disturbance. 5.1.3 The ambient temperature is within the range of (20±5)℃. The temperature change shall not exceed the temperature specified in Table 3. Table 3 allows for humidity change. 5.1.4 Before testing, the standard instrument and the instrument to be tested shall be placed in the environment specified in 5.1.3 for at least 4 hours. 5.2 The absolute error limit of the standard instrument shall not exceed 1/4 of the absolute error limit of the instrument to be tested. 5.3 General requirements for testing 5.3.1 The non-essential reading error and repeatability of the flow meter shall be tested at each slope constant. 5.3.2 At any slope constant, the following matters shall be done before the measurement: ! The gas in the working medium and the liquid in the outlet of the exhaust gas are full: 1) Make the liquid level of the working medium align with the equal point scale of the scale. 5.3.3 When measuring overload, the change of zero indication should not exceed 1/4 of the basic error limit. Test points
For instruments with an accuracy of 0.5, five points of 20%, 40%, 60%, 80%, and 100% of the range are selected; for instruments with an accuracy of 1.0 and 1.5, only three points of 20%, 60%, and 100% of the range are selected.
Repeatability test points can be selected at random from the above points, but not less than two points. 5.5 Basic error test
The basic error of the indication of the instrument is carried out by comparing the standard instrument with the instrument under test. 6.5.1 For the instrument with a width of 0.5 (Pa) as the unit, the basic error is calculated according to formula (1): f
Where: R—indication of the instrument under test (Pa): X100%
Density of working medium of the instrument under test at working temperature (/): 0-standard temperature (20%) Density of working medium of the instrument under test (/): P——indication of the standard instrument (Pa)
--the upper limit value of measurement on the corresponding normal effective value of the instrument under test (P%). P
5.5.2 For the instrument with a width of 0.5 (mm) as the unit, the basic error is calculated according to formula (2). 8) The inclination band number does not include the working medium density. es=×100%
JB/T92761999
Where: —Insert inclination constant (excluding working medium density), which is the angle between the measured potential and the horizontal plane; a-—The filter height of the instrument under test (): n——The liquid column height of the standard instrument (nu)
L—The upper limit of the plate of the instrument under test at a certain inclination constant value (m). hl The inclination constant includes the working medium density. e
Where: K is the inclination constant of the instrument (including the working medium density), that is, asma (kg/u). 5.6 Performance test
5.6.1 The instrument should be tested for mutual performance. A value error test should be carried out at the selected test point. The difference between the maximum and minimum values of the three indications in the same test point should not exceed the provisions of 4.4. 5..2 For instruments with a fixed angle, three indication error measurements shall be carried out directly. 5.6.3 For instruments with adjustable angles, after one measurement, the inclined rod of the instrument measuring glass tube shall be rotated once, and then returned to its original position as far as possible before the next measurement.
5.6.4 Repeatability error test shall be carried out on each constant. At the same required value, it is not allowed to calibrate the indication zero point during the measurement. 5.7 Sealing test
The sealing test of the instrument shall be carried out without filling the medium with old air pressure. For instruments monitoring pressure, the measuring range shall be consistent with the required range of the instrument being tested, and its accuracy level shall not be lower than level 2.5. If the pressure is evenly pressed, it shall be kept for 10 seconds after the pressure stabilizes, and the pressure shall be observed to see if there is any pressure drop.
5.8 Compression strength test
It is carried out after the sealing test. The pressure rises to the current set value and maintains for 5min. Observe the small instrument to see if there is any drop. 5.9 Measuring device, scale zero adjustment device, level, vernier reading device, appearance and marking inspection. Visual inspection,
5.10 Environmental performance test
It is carried out according to the requirements of 4.13 and the test method specified in JB/T9329. After the test, it is inspected according to the provisions of 5.4-5.7. 6 Control rules
6.1 Factory inspection
It is carried out according to the provisions of 4.3-4.5.4.7-4.12 and 7.1. It is released after passing the inspection. 6.2 Type inspection
Type inspection shall include all test items specified in this standard. Type inspection shall be carried out in any of the following cases: a) Trial and test of new products
b) Regular testing of mass-produced products;
when there are changes in design, process, materials, etc. that may affect product performance; d) When the production of instruments is discontinued, marking, packaging and storage
7.1 Marking
: 7.1.1 The value of the control band number shall be marked on the preformed plate of the instrument. 7.1.2 The valves of the instruments shall have obvious on-off marks. 7.1.3 The nameplate of the instrument shall be marked with: a.
Manufacturer name or factory logo:
6) Product name and model
Maximum value and measurement unit;
E4T8278-1639
() Standard temperature (20℃) Working temperature range:
Maximum working pressure:
Manufacture year and month and production number.
7.2 Packaging
The packaging of the meter shall comply with the provisions of 15464 below, and the protection type shall be determined by the manufacturer. 7.3 The meter shall be stored in a dry and ventilated room, and the indoor air shall not contain any harmful noise that may cause discomfort. E
JB/T 9276- 1999
Appendix A
(Standard attachment)
Test sequence
Example quantity or glass required, standard pressure, re-level quantity, standardization, etc. Standard damage item installation quantity external base mark inspection
Density and pressure according to the design and treatment
Determination of indication weight change
Anti-damage test auxiliary irritation test
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