JB/T 9842-1999 This standard is a revision of ZB T68 002-90 "Bourdon tube pressure gauge for tractors and internal combustion engines". This standard specifies the product classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of bourdon tube pressure gauges for tractors and internal combustion engines. This standard applies to bourdon tube oil pressure gauges and air pressure gauges installed on tractors and internal combustion engines. This standard was first issued as NJ 239-81 on July 13, 1981, and was first revised as ZB T68 002-90 on June 20, 1990. JB/T 9842-1999 Bourdon tube pressure gauge for tractors and internal combustion engines JB/T9842-1999 Standard download decompression password: www.bzxz.net

1S65.060.10
Machinery Industry Standard of the People's Republic of China
JB/T9842—1999
Bourdon tube pressure gauge for tractorsandinternal combustionengines1999-08-06Promulgated
State Bureau of Machinery Industry
Implementation on 2000-01-01
JBLT:9842-1999
This standard is a revision of ZBT68002—90 Bourdon tube pressure gauge for tractorsandinternal combustionengines. During the revision, the original standard was shortened and the main technical contents were changed. This standard replaces ZRT68002:90 from the month of implementation. This standard is proposed and posted by the National Standard Machinery Standardization Technical Committee. The drafting unit of this standard is Luoyang Tractor Research Institute. The main drafter of this standard is Chen Jiagu
Machinery Industry Standard of the People's Republic of China
Bourdon tube pressure gauge for tractors and internal combustion engines Rourdion tuhe pressure gauge for tractors and internal combustion engines JB/T9842-1999
This standard specifies the product classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of wide tube pressure gauges for tractors and internal combustion engines.
The standard is applicable to the bouton tube oil pressure gauge and gas gauge (hereinafter referred to as pressure gauge) installed in tractors and internal combustion engines. 1 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are all valid. All standards are subject to revision: All parties using this standard shall discuss the possibility of using the latest version marked below. GBT 2421.4·--1993
Basic environmental test procedures for electronic products Test DD: Alternating damp heat test method GB/T2423.16—1990 Basic environmental test procedures for electronic products Test J: K mildew test method GB/T2423.17—1993
Basic environmental test procedures for electric and electronic products Test Ka: Salt drop test method GB/T2828—1987
GB/ 4942.2—1993
3 Product classification
Batch inspection counting and sampling procedures and sample throwing table [Applicable to the inspection of consecutive batches] Protection level of low-voltage electrical enclosure
3.1 The structural form is single-tube type. According to the requirements of use, it is divided into common type and heat-resistant type. (The following are not mentioned as ordinary type) 1.3.2 The accuracy of the pressure gauge is divided into: 2.5 level: 4.0 level. 3.3 The measuring range of the pressure gauge should be as shown in Table 1: 1
3.4 ​​The square pressure gauge is shown in Figure 1, and the direct-acting pressure gauge is shown in Figure 2. Its structural dimensions should comply with the provisions of Table 2: Table 2
13: 55; 60
National Beijing Machinery Industry Bureau approved 1999-08-06 7n
2000-01-01 implementation
4 Technical requirements
JB/T 9842-1999
4.1 The pressure gauge shall meet the requirements of this standard and shall be manufactured in accordance with the drawings and technical documents approved by the specified procedures. 4.2 Measurement and graduations
4.2.1 Basic value of pressure gauge: MPas
4.2.2 Within the scope of the pressure gauge, there shall be no less than three graduations on the dial: zero point, middle value and upper limit value. The pressure gauge shall be located at 2 points of the upper limit value.
4.3 Standard environmental conditions shall comply with the provisions of Table 3. 4.41 Operating environmental conditions shall comply with the requirements of Table 4. 4.5 Pressure gauge installation position: The angle between the plane and the horizontal plane is 30°-40°. Table 3
Relative degree%
60 ± 15
96i ± 16
JB/T9842—1999
4.6 The upper limit of the use rate pressure of the multi-share is 34. Table 4
T Operating temperature C
41-+711
4.7 Appearance
4.7.1 Front sealing inner hook
4.7.2 The protective layer should be uniform, without obvious bubbles, spots, rust and debonding defects. 4.7.3 Glass or other transparent materials should not Defects that may damage the reading shall be avoided. 4.7. The scale points, lines, symbols, letters and other marks shall be clear and accurate. 4.5 The exposed part shall not cause glare, and the pointer shall be within the scale line. 4.7.6 The needle shall be flat, and the indicating end shall be within the scale line. The distance from the dial plane shall be within the range of 1-3mm. When no load is applied, the pointer of the pressure gauge with the upper pin shall be on the stopper. The axis of the pointer of the pressure gauge without the stopper shall be within the scale line. 4.7. The parts shall be firmly assembled, and the parts shall not have any movement phenomenon. The parts shall not have any cracks or defects that affect the performance. 4.8 The paint layer shall be firmly attached except for those in accordance with 47.2. After the temperature effect test, the paint layer shall not show any wrinkles. After the temperature gauge is subjected to the alternating heat test, the primer shall not fall off, and the topcoat shall not fall off for more than 10 minutes. 4.9 Performance
Except as specified in 4.7.2, the plated surface shall be bright in color. After the mixed heat type pressure gauge is subjected to alternating damp heat test, the plated surface shall not show corrosion. 4.10 Energy
4.10.1 Stability of pointer rotation
When the pressure changes steadily, the pointer shall move steadily without jumping or sifting. 4. 10.2 Basic error The indication of the power meter is prohibited from being indicated by reference. In the standard environment, its value should not exceed the provisions of Table 5. Table 5 is accurate. 4.10.3 Back and forth error With stop pin Without upper pin The back and forth error of the indicated value should not exceed the absolute value of the basic error of indication 4.10.1 Tap displacement The rest of the measurement range is within the three-position range. For light duty meters, the empty space of the pointer indication value should not exceed 50% of the absolute value of the basic error of indication 4.10.5 Overload JB/T 9842—1999
The pressure gauge shall withstand an overload test of 120% of the upper limit value for 30 minutes. After the test, it shall comply with the provisions of 4.10.1-4.10.4. 4.106 Temperature influence
When the pressure gauge is subjected to a temperature influence test at an ambient temperature of 1°C, the absolute value of the change in the indication caused by the test shall comply with the following provisions: a) A 2.5-level pressure gauge shall not exceed 3.5% of the upper limit value. b) A 4.0-level pressure gauge shall not exceed 4% of the upper limit value. After the test, it shall comply with the provisions of 4.8, 4.10.[-4.10.4. 4.10.7 Vibration resistance
The pressure gauge shall be able to withstand the sweep frequency vibration test with test parameters in accordance with Table 6 of the fixed frequency alarm table 7. After the test, it shall comply with the provisions of 4.7.7 and 4.10.1, and the absolute value of its indication change shall comply with the following provisions relative to the test: 2.5 The pressure gauge shall not exceed 1.5% of the limit value; b) The 4.0 grade pressure gauge shall not exceed the upper limit value by 7%. Table 6
Vibration frequency
Sweep frequency specification Hz
17-200
When the displacement or excitation intensity
17-60Hz, 0.35mm
60~20UHz. 43m/s
The pressure gauge shall be able to prevent dust from entering the interior. 4.10.9 Waterproof
The pressure gauge shall be able to withstand water in all directions, and water shall not enter the interior. 4.10.10 Durability
Test time
Sweep number
The pressure gauge should be able to withstand 30,000 alternating load changes. After the test, it should meet the requirements of 4.17, 4.10.1 and 4.10.2. 4.10.11 Alternating damp heat
The damp heat type pressure gauge can withstand the alternating adjustment test of 40% of the high temperature and 6 cycles. After the test, it should meet the requirements of 4.1.7, 4.8, 4.9, 410.1 and 4.10.2:
4. 10. 12 Salt resistance
The damp heat type pressure gauge should be able to withstand the salt test of 16h. After the test, it should meet the requirements of 4.10.1 and 4.10.2. 4.10.13 The attached heat and humidity tester shall have a certain degree of protection. After each test, the exposed area shall not exceed 4.10% of the surface area.14 Warranty period
JR/T9841-1999
The manufacturer shall be responsible for free repair or replacement of the pressure gauge if it is damaged or cannot work properly due to defects within one year.
5 Test riding method
5.1 Test conditions
5.1.1 The pressure indication value test shall be carried out in the environmental conditions specified in 4.3. 5.1.2 The pressure gauge installation shall comply with the provisions of 4.5. 5.2 Test instruments and equipment
The standard instruments shall use precision pressure gauges, piston pressure gauges, digital force gauges, etc. The absolute value of the absolute error of the standard instrument group used shall not exceed 13 of the absolute value of the absolute error of the pressure gauge under test. 5.3 Appearance inspection
Inspect with eyes at a distance of 510mm under a uniform illumination of about 300]x. 5.4 Paint layer inspection
5.4. Paint layer appearance inspection according to 5.3
5.4.1 Reading layer sinking test. That is, on the surface of the pressure gauge paint that has been fully dried in the standard environment, use a new No. 1 or No. 12 plastic sheet to make 4 cross-sectional passes, each pass is 1mm thick, forming 9 small squares, and the continuous layers in the squares are measured. 5.4.3 The temperature inversion performance of the paint layer shall be inspected after the temperature influence test. 5.4.4 The alternating heat filter performance of the paint layer shall be inspected after the alternating humidity and heat test. 5.5 Layer inspection
5.5.1 The appearance of the layer shall be inspected according to 5.3.
5.2 The alternating humidity and heat performance of the layer shall be inspected after the alternating humidity and heat test. 5.6 Technical error inspection
Inspect by comparing the pressure gauge with the standard instrument. The grade marked with numbers is the inspection point. During the test, the load should be increased steadily from zero, and the upper limit value of each test point should be checked and maintained for 3 seconds, then the value should be zeroed and the test point should be checked. The test point should be read twice: one time when the load reaches the specified test point steadily, and the other time after the meter is adjusted. 5.7 Pointer deflection stability test
Check in the adjustment of 5.6
5.8 Meter return difference test
Check the indicated value after the positive and negative measurement points of 5.6 are adjusted steadily. 5.9 Tap and pull test
Check the indicated value before and after the same test point in the adjustment of 5.6. 5.10 Overload test
Make the tension gauge bear a load of 120% of the L limit value on the quality test bench and maintain the pressure for 30 minutes. After removing the negative wire, insert 5.6~5.9 within 30mm for testing. 5.1 Temperature influence test JB/T9842—1999 First, check the pressure indication in the standard environment, then put the pressure gauge into the low temperature (and high temperature) chamber, cool down (and heat up) to 4n+3: (and 709±2%), start to bear 3/4 of the limit load, keep it for 21 after the temperature stabilizes, and then check its indication to get the ratio of the low temperature (and high temperature) to the indication in the standard ambient temperature. After the test, place the pressure gauge in the standard environment for 4h, press it manually 5.4.5.6~5.9 Test
5.12 Perturbation Test
Fix the flat force gauge on the vibration test bench so that it bears the middle value of the load. The vibration is shaped into a sine wave, and the added waveform distortion should not exceed 25%; the frequency sweep is carried out continuously, and the rate changes exponentially with time: the frequency difference: 5~5012, it is 111z: when it is 5D11z, it is ±2% of the flow rate. During the test, first complete the dependent motion, and then do the frequency control. After the test, the force gauge should be weighed for 4 hours, and then tested according to 5.3: 5.6 and 5.1. 13 Dust test
Carry out according to the test method and conditions of JP5X in GB:T4942.2. 5.14 Water test
Carry out according to the test method and conditions of IPX4 in GB:T4942.2. 5.15 Durability test
On a special test bench, subject the power meter to a frequency of 0.5~11z, and the positive wave amplitude must be 20%-80% of the upper limit value of the alternating negative test, and then test according to 5.3 5.6 and 5.7 inspections, 5.1 alternating heat test
according to the provisions of GD/T2423.4, after the test, the pressure gauge is placed in the standard environment for 21 hours, and then 5.1-5.7 are tested. 5.17 salt test
according to the provisions of GB/T2423.17, the test duration is 161. After the test, the pressure gauge is placed in the standard environment for 2 hours, and then 5.6 and 5.7 are tested.
5.18 long each test | |tt||Perform the test on representative parts according to the provisions of GB/12423.16. After the test, the tester is taken out of the test box and immediately subjected to the test
Perform the test according to the provisions of GR/T212.3.16. Parts made of materials with a surface thickness not exceeding 50% of the surface thickness may not be subjected to the skin test.
6 Inspection rules
6.1 Inspection categories
The test of the tester is divided into factory inspection and Inspection and type inspection: 6.2 1 Inspection
The small force gauge must be inspected according to 4.74.10.1~4.10.4, and can leave the factory only after meeting the requirements. 6.3 Type inspection
Type inspection should be carried out in any of the following situations:) Trial production of new products or old products transferred to the factory for production {) After the production process, if there are major changes in structure, materials, and process, which may affect the product performance; e) During regular production, after the fixed production or accumulated production is completed, it is completed. Conduct an inspection once a year: d) After the product has been out of production for a long time, when the product is produced, 6.3.1 Sampling method
JB/T9842-1999
. 3.1.1 Acceptance shall be carried out according to the single standard sampling plan specified in GB/F282%, and the first inspection level II shall be used. 6.3.1.2 Inspection batch N-2650 sets
6. 3.1.3 Sample size㎡-8
6.3.1.4 The classification of unqualified products is shown in Table 8.
Classification
Class A unqualified
Class B qualified
Classification of ten types
Qualified item name
Pointer transmission level performance requirements
Basic error requirements
Frame load requirements
Resistance to vibration requirements
Flight error requirements
Some displacement requirements
Temperature response requirements
Exit requirements| |tt||Requirements for waterproofing
Requirements for dense village
Requirements for protective layer
Requirements for other protective materials
Requirements for thorny seat
Product part acceptance
Requirements for pointers
Requirements for assembly parts
Requirements for lake layer wood
Requirements for Yao Hong Technology
Requirements for knot sizebZxz.net
6.3.1.5 Sampling plan is shown in Table 9. Ac and Re are the number of unqualified points for samples. 6.3.7 Implementation of drag sampling inspection
After sampling, the following inspections shall be carried out according to Table 8: S category, A potential 1st and 2nd items. Then they are divided into four groups and each group is inspected for items
Group 1 will be inspected for item 3 of Class A and item 3~5 of Class A, Group 2 will be inspected for item 1 and item 2 of Class B and item 4 of Class 4. Group 2 will be inspected for durability
Group 2 will be inspected for alternating source potential dynamic salt spray test Table 9
Compared to the whole category
6.3.3 Evaluation of individual inspection
JBTT9842—1999
6.3.3.1 If the inspection results of the first and second groups and 6.3.2 meet the requirements of Table 9, they will be evaluated as qualified, otherwise they will be evaluated as unqualified: 6.3, 3.2 If there are any defects in durability, alternating humidity and heat resistance and crack resistance, and the test does not meet the requirements, it will still be evaluated as unqualified. 7.1 Labeling
The pressure gauge should be marked with:
a) manufacturer's name or trademark and address;
b) product model or name;
|) inspection mark;
d) manufacturing date.
7.2 Packaging
7.2.1 Each pressure gauge and accessories must be collected separately, and no movement is allowed in the packaging box. The total weight after packing is generally less than 40kg
7.2.2 The following contents should be marked on the outside of the packaging box:
a) name and address of the receiving unit;
b) product name or model, specification number;
c! Name and address of the shipping company:
Total per box:
Total words or logos such as "跖炭", "欧潮", "慎轻散", "不倒置" are added 7.2.3 The documents accompanying the packing are:
a) Product certificate:
h) Product manual;
) Packing list
3.3 Transportation
Transportation should be accompanied by
, 4. The pressure gauge should be stored in a ventilated room. The indoor air should not have a corrosive effect on the pressure gauge. 7.4.2. The storage period of the Leli meter is 2 years (from the manufacturer's warehouse entry). During the initial storage period, the small meter should comply with the requirements of the import standards.
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