Some standard content:
Mechanical Industry Standard of the People's Republic of China
JB/T549191
Diaphragm Pressure Gauge
Published on 1991-07-15
Ministry of Machinery and Electronics Industry
Implemented on 1992-07-01
Mechanical Industry Standard of the People's Republic of China
Diaphragm Pressure Gauge
Subject Content and Scope of Application
JB/T5491-91
This standard specifies the product classification, technical requirements, test methods, inspection rules and marking, packaging and storage of diaphragm pressure gauges. This standard applies to pressure gauges, vacuum gauges and pressure vacuum gauges (collectively referred to as instruments) with metal diaphragms as sensitive elements. Reference standards
ZBY002
General pressure gauge
Basic environmental conditions and test methods for transportation and storage of instruments and metersGeneral technical conditions for packaging of instruments and meters
Basic types, dimensions and general technical requirements for the pointer indicating part of industrial automation instrumentsWorking conditions of industrial automation instruments - vibrationVibration (sinusoidal) test methods for industrial automation instruments9119.10PN4.OMPa (4Obar)Raised plate type flat welded steel flangeProduct classification
Instruments are divided into:
Threaded joint installation type;
b. Direct flange installation type;
c. I-shaped flange installation type.
3.2Instruments are divided into: a. Ordinary type;
b. Corrosion-resistant type according to the material of the part in contact with the measured medium.
Instruments are divided into: Φ100 and Φ150mm according to the nominal diameter of the shell. 3.3
The accuracy level of the instrument is divided into: 1; 1.5; 2.5. The measuring range of the instrument shall comply with the provisions of Table 1. Table 1
Parameter name
Pressure Vacuum
0~0.06:
Measurement range
0~1;0~1.6;
0.1~0.06;
0.1~0.15;
-0.1~0.9;
Approved by the Ministry of Machinery and Electronics Industry on July 15, 1991 0~4.
0~9.25;
0.1~0.3:
Implementation on July 1, 1992
3.6 Grid value and scale division
JB/T5491-91
The minimum grid value of the instrument shall comply with the provisions of Table 2. 3.6.1
Nominal diameter of housing
Minimum grid value MPa
Measuring range MPa
0~0.1;.-0.1~0
Accuracy level
0~0.16;-0.1~0.06
0~0.25;-0.1~0.15
0~0.40.1~0.3
0~0.60.1~0.5| |tt||0~1;-0.1~0.9
0~1.6；-0.1~1.5
0~2.5；-0.1~2.4
3.6.2 Instrument scale division
1;1.5;2.5
a. The scale division of the instrument with a nominal shell diameter of Φ100mm and an accuracy of 1, 1.5, 2.5 shall comply with the provisions of Table B2 in Appendix B (Supplement) of GB1226.
b. The scale division of the instrument with a nominal shell diameter of Φ150mm and an accuracy of 1, 1.5, 2.5 shall comply with the provisions of Table B3 in Appendix B) of GB1225.
3.7 Connection dimensions for instrument installation
3.7.1 The threaded joint dimensions of threaded joint installation instruments shall comply with the provisions of Article 1.10 of GB1226. 3.7.2 The connection and sealing surface dimensions of direct flange installation instruments shall comply with the requirements of flange 50-40 specified in GB9119.10. 3.7.3 The connection and sealing surface dimensions of I-flange installation instruments shall comply with the requirements of flange 20-40 specified in GB9119.10. 4
The materials used in the parts in contact with the measured medium in corrosion-resistant instruments should have good anti-corrosion properties. 5 Technical requirements
5.1, Normal working conditions
5.1.1 The normal working environment temperature of the instrument is -40~70℃; 5.1.2 The vibration conditions for normal operation of the instrument shall not exceed V·H·3 level specified in GB4439. 5.2 Reference working conditions
JB/T5491—91
The reference working conditions of the instrument shall comply with the provisions of Article 2.2 of GB1226. 5.3 Basic error of indication
The basic error of indication of the instrument shall comply with the provisions of Article 2.3 of GB1226. 5.4 Back and forth difference
The back and forth difference of the instrument shall comply with the provisions of Article 2.4 of GB1226. 5.5 Stability of pointer deflection
The stability of pointer deflection of the instrument shall comply with the provisions of Article 2.5 of GB1226. 5.6 Tap displacement
The tap displacement of the instrument shall comply with the provisions of Article 2.6 of GB1226. 5.7 Overload
The instrument measuring pressure and pressure vacuum shall be able to withstand a load of 125% of the upper limit of the pressure part and an overload test lasting 30 minutes. After the test, it shall comply with the provisions of Articles 5.3 to 5.6. 5.8 Temperature influence
When the ambient temperature deviates from 20 ± 5℃, the indication error of the instrument (including the zero point) shall not be greater than the range specified by the following formula: △=±(8+K△t)
Wherein: △——the allowable value of indication error when the ambient temperature of the instrument deviates from 20 ± 5℃, expressed in the same way as the basic indication error, %, 8——the absolute value of the basic indication error limit specified in Article 5.3 of this standard, %At-t,-tl,C;
t，——any value of the ambient temperature specified in Article 5.1.1 of this standard, ℃; t，——25℃ when t2 is higher than 25℃, and 15℃ when t2 is lower than 15℃; K——0.04%/℃, for metal diaphragms;
0.06%/℃, for diaphragms with coatings. 5.9 Alternating load
The instrument shall be able to withstand 3×10 cycles of sinusoidal waveform alternating load test, during which the load variation range shall be 30% ± 5% to 70% ± 5% of the range. After the test, it shall comply with the provisions of Articles 5.3 to 5.6. 5.10 Indicating device
5.10.1 Scale direction
The scale direction of the instrument shall comply with the following provisions: a. The zero scale line of the pressure gauge shall be located at the left end of the scale, and scale from zero to the right in a clockwise direction. b. The zero scale line of the vacuum gauge shall be located at the right end of the scale, and scale from zero to the left in a counterclockwise direction. C. The zero scale line of the pressure vacuum gauge shall be located between the vacuum part scale and the pressure part scale, and the vacuum part scale shall scale from zero to the left and counterclockwise, and the pressure part scale shall scale from zero to the right in a clockwise direction. 5.10.2 Zero scale line
The scale reduction of the actual zero point scale of the instrument dial with a stop pin shall not be greater than the absolute value of the basic error limit of the indication. The zero scale line of the instrument dial without a stop pin shall be indicated along the scale baseline, and the indicated range shall not be greater than twice the absolute value of the basic error limit of the indication. 5.10.3 Scale line
For instruments with accuracy levels of 1, 1.5, and 2.5, the width of the long scale line, the middle scale line, and the short scale line shall not be greater than that specified in Table 3. The long scale line adopts a semi-thick line, and the width of the thick part of the semi-thick line shall not be greater than 3 times that specified in Table 3. 3
Nominal diameter of shell
5.10.4 Instrument pointer
The instrument pointer shall comply with the provisions of ZBY122. 5.10.5 Distance between instrument pointer and dial JB/T5491--91
The distance between instrument pointer and dial shall comply with the provisions of Article 2.10.2 of GB1226. 5.11 Appearance
The appearance of the instrument shall comply with the provisions of Article 2.11 of GB1226. 5.12 Vibration resistance in working environment
Width of scale line
The instrument shall be able to withstand the V·H·3 vibration specified in GB4439. After the test, the instrument shall comply with the provisions of Articles 5.3 to 5.6. 5.13 Transport environment resistance
Under the transport packaging conditions, the instrument shall be able to withstand the tests specified in ZBY002, among which the high temperature, low temperature and relative humidity items are exempted, and the free fall height is 250mm. After each test, it shall comply with the provisions of Articles 5.3 to 5.6. 6 Test methods
The test sequence and interval time between items shall comply with the provisions of Appendix D (Supplement) of GB1226. 6.1 Indication test
The basic error of the indication value, the back-and-forth error, the stability of the pointer deflection, the tapping displacement and the zero point test shall comply with the provisions of Articles 3.1 to 3.5 of GB1226.
6.2 Overload test
Under the reference working conditions, the instrument shall be subjected to an overload test in accordance with Article 5.7. After the load is removed, it shall be tested within 30 minutes in accordance with Article 6.1.
6.3 Temperature influence test
Place the instrument in a constant temperature box, and gradually increase (decrease) the temperature to the upper (lower) limit of the temperature range specified in Article 5.1.1 of this standard, and subject the instrument to a load of 3/4 of the upper limit. After the temperature stabilizes, keep it for no less than 3 hours, and then test it according to the provisions of Article 3.1.4 a of GB1226. 6.4 Alternating load test
Under reference working conditions, install the instrument on a device that can generate a sine wave with a frequency of 60±5 times/min, and the alternating amplitude and number of times meet the requirements of Article 5.9. After the test, test it according to the provisions of Article 6.1 within 30 minutes. 6.5 Indicator, appearance and mark inspectionWww.bzxZ.net
Visual inspection.
6.6 Anti-working environment vibration performance test
The instrument shall be tested according to the test parameters and requirements of 1-A specified in GB4451. The durability test adopts the quota test, and after the test, it shall be inspected according to the provisions of Article 6.1.
6.7 Test of performance against transport environment
The instrument shall be tested in accordance with ZBY002 and then inspected in accordance with Article 6.1. 7 Inspection rules
7.1 Factory inspection
7.1.1 Inspection items
The factory inspection items of the instrument shall be in accordance with the provisions of Table 4.
JB/T5491—91
Name of factory inspection items
Indicating device and appearance, marking
Basic error of indication
Internal difference
Pointer deflection stability
Tap displacement
Inspection and judgment rules
5.10;5.11,8.1
Inspect the instruments one by one according to the factory inspection items specified by the inspection department. If one item of a certain instrument fails to meet the standards, the instrument shall be judged as a defective product. Only those that have passed all the specified factory inspection items can be judged as qualified products, and qualified products should be accompanied by a certificate of qualification in a certain format. 7.2 Type inspection
In any of the following cases, the instrument should be type inspected according to all the required items of this standard. Trial production and identification of new products or old products transferred to the factory for production; a.
For instruments in normal production, when there are major changes in design, process, materials, etc., which may affect product performance; c.
Instruments produced in batches should be subject to periodic regular inspections; when instruments that have been out of production for a long time resume production, when the national quality supervision agency proposes a requirement for type inspection. Marking, packaging and storage
1 Marking
The dial of the instrument should generally be marked with:
Manufacturer name or trademark;
Instrument name
Unit of measurement;
Accuracy grade;
Instruments for special purposes should have corresponding markings; the year and month of manufacture and the instrument should be numbered or batched. 8.1.2
Instruments with the same appearance and structure but different diaphragm materials should have distinguishing marks. 8.2 Packaging
Instrument packaging should comply with the relevant provisions of ZBY003, and the protection type shall be determined by the manufacturer. 8.3 Storage
Instruments should be stored in a ventilated and dry room, and the indoor air should not corrode the instrument. 5
Additional instructions:
JB/T5491—91
This standard was proposed and managed by Xi'an Industrial Automation Instrumentation Research Institute. This standard was drafted by Xi'an Industrial Automation Instrumentation Research Institute. The main drafters of this standard are Cui Ziqiang, Li Zhichao, Ma Zhenchuan, and Hou Shunxing.
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