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Verification Regulation of Ralative Density Balance for Liquid JJG 171—2004
Ralative Density Balance for Liquid
Ralative Density Balance for Liquid
2004-06-04 Issued
2004-12-01 Implementation
State Administration of Quality Supervision, Inspection and Quarantine httn·//wwJJ 171-· 2004
Verification Regulation of Ralative Density Balance for Liquid JJG 17I—2004
Replace JJG 171—1985
This regulation was approved by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China on June 4, 2004, and will be implemented on December 1, 2004
Responsible unit:
Main drafting unit:
Mengjia Drafting unit:
National Technical Committee for Quality and Density Meters
Shanghai Institute of Metrology and Testing Technology
China National Institute of Metrology
Shanghai Precision Scientific Instrument Co., Ltd. (Tianping Instrument Co., Ltd.) This regulation is entrusted to the National Technical Committee for Quality and Density Meters for interpretation. httn·//uwrThis regulation mainly involves:
Ding Jing'an
Participating drafter:
JJG 171 -2004
(Shanghai Institute of Metrology and Testing Technology) (not the National Institute of Metrology)
(Shanghai Institute of Measurement and Testing Technology) [Shanghai Precision Scientific Instrument Co., Ltd.) (Daping Instrument Factory) httn·//www2
Fan Guo·
References
Terms and measurement units
Structural diagram
Basic configuration requirements
Metrological performance requirements
General technical requirements
Control of measuring instruments·
Verification items
Verification conditions,
Verification methods
Processing of verification results·
Verification cycle
JJG 171 2004
Appendix A
Comparison table of relative density of distilled water at different concentrations Appendix B
Liquid relative density balance verification certificate form Appendix C Liquid relative density balance verification result notification form Appendix D Body relative density verification record, business form httn·//ww(1)
1 Scope
JJG171204
Liquid relative density balance verification procedure
This procedure applies to 1 Liquid relative density does not exceed 2. 0000 mechanical droplet relative density balance initial verification, subsequent verification and in-use inspection
2 References
This regulation refers to the following documents
JJG98-1990 "Non-automatic balance" verification procedure JJG99-1990 "Basic code" trial verification procedure JJF1001-1998 General metrology definition 01M1.H76 "Automatic machine" international recommendation
When using this regulation, please pay attention to the use of the current valid versions of the above referenced documents. 3 Terms and measurement units
3.1 Special magnetic code (spmcial pmTnae weight) is a silicon code specially configured for the density balance for liquid analysis, including approximate code, riding code, medium estimate:, and prospect. 1) The hook-shaped weight is called the hook weight, and its mass is 15g-2) The weight that can be placed and moved on the crossbeam is called the riding weight 3.2 The whole set of measuring chain (weightslen)
is composed of the measuring hammer, double sodium weight and wire wire with the corresponding fixed volume and mass, and the unit is: the measuring vertical relative fixed body and the glass end rod with mass pressure. At 20 seven, the measuring volume is 5rm, 3.3 Crossbeam (chuuiel lu:am)
There are 10 V-shaped grooves evenly distributed on the large crossbeam, which are specially used to place various fixed riding weights. 3.4 Space of beam graduatian The distance between the centers of two adjacent notches of the beam graduatian is 3.5 Relative density Under given conditions, the ratio of the liquid to the water required to remain 20% below the temperature when the liquid is graduating is called relative density. The symbol is d and the expression is d%=.*
In this specification, the relative density of liquid is expressed as 4 Overview
4.1 Principle
Liquid relative density balance utilizes the Archimedes law and the lever principle. It uses a standard measuring weight to immerse the positive liquid to obtain buoyancy and make the beam lose balance. Then, various feet are placed in the V-shaped probe of the beam to make the beam return to normal. 1
httn:L/wwwJJG: 171—204
Balance, that is, can accurately measure the relative density of the liquid, 4.2 Application
Relative density balance is a device used in laboratories of medical, chemical, scientific research and other departments to measure the relative density of the liquid:
4.3 Structural diagram
1 Main body: 2 Support system: 3 Bracket: 4 Knife holder: 5 Joint device: 6 Drawing: 7 Center of gravity: X-elbow: 1—Thickness: 11—Measurement 111—Loading: 12—15g Size: 13—Or, 14—Reporting diagram 1 Relative density balance structure
4.4 Configuration requirements
The entire liquid relative density is mostly composed of large horizontal beams, columns, A complete set of measuring instruments, thermometers, basic instruments, etc., with a set of special codes for half a day. 5 Performance requirements
The performance of the balance meter should be able to meet the requirements specified in Table 1. Table 1 Balance metrological performance
Balance metrological performance
Adjustable difference between the pressure of the lock and the 15g code
Maximum allowable error
Food partner k partner network bttn://www.metronomical performance
No card inflammation
Thank you for your error
J.IG171—2004
Table 1 (continued)
Register detailed error
When the measuring instrument is balanced in the water, after the code is transferred to the balance, the deviation of the pointer from the stop point is not less than 1mn± 0.0004
Relative error caused by the difference in spacing between the beams. Relative density caused by the gravity of the balance. The relative density error of the balance will be determined first. After verification, the relative density error of the balance will be verified. Note: The relative density error of the balance refers to the measurement of the machine and the scale. The relative density error caused by the gravity of the balance must be summed. Technical requirements for use
6.1 No logo on the appearance
6.1.1 Appearance
The appearance of the liquid relative dense skin balance should not have mechanical scratches that affect the performance. Its structure and control parts should be neat and easy to operate: all accessories should be complete.
6.1.1: The blade of the 5g, 500m code checker should be arc-shaped, and its angle should not be greater than 2/3 of the angle of the beam indexing groove, and there should be no irregular bends.
6.1.1.2 The surface of the balance beam should be smooth and free of cracks, shrinkage holes, and sand holes. The indexing must be smooth and free of burrs and jagged defects.
6.1.1.3 The balance pointer on the horizontal axis and the fixed pointer on the column frame should be on the same axis, and the distance should not exceed 1mm.
6.1.1.4 The blade edge and the blade bearing working surface should not have marks, defects, etc. 6.1.1.51
The surface to be evaluated should be smooth and should not have scars, bubbles, defects, etc. If a thermometer is attached to the measuring hammer, its indexing spring should be tightly attached to the measuring hammer and should not slide. 6.1.1.6
The auxiliary filter wire should be made of platinum wire with a diameter of (0.15-.0.20)m or corrosion-resistant and unbreakable materials.
6.1, 1.8 The cover of the double hook should not have visible seams after being tightened. 6.1.2 It should be equipped with the following clear and durable marks: 1) Name of manufacturer;
2) Model:
3) Export number:
4) Manufacturing equipment license mark and number. 6.2 The total mass of the whole test piece should be equal to 15g. 6.3 The mass of the single hammer should be greater than g.
Food Parts k companion network bttn://www6.4 The minimum graduation value of the thermometer is 0.5%
JJG:171—2004
6.5. The components of the H-type magnetic field should meet the requirements of 2. Other performances should meet the requirements of the current operation process. Requirements for special codes
Discussion of mother equipment control
Nominal quality
Quality difference / g
Meter control and measurement package: self-calibration, subsequent inspection during use of cooling agent:? .1 Fixed day
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Appearance and logo
Set of absolute chain and 15 hook code
See the difference
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7.2, calibration conditions
2, test environment conditions
post-test
said in the use of Teaching
foodmate.net httn.//wwwfoodmate.netJ.G:171—2404
Temperature: (=5) Relative humidity: 0% The performance of the gas storage can be determined for the first time, and the continuous inspection must be carried out in the steamer before (0) 7.3.2
Inspection in use in the continent (+1) 1.2.3
7.2.4 Meter to standard and main configuration changes
F) Hygrometer
Reading range (0~50), the minimum value is .29?: Verification special standard method set
Table 4 Verification special standard method run
: Code
Nominal quality value
s00rmg
495alg
Quality display/ng
Note: The balance card is 495ms, 490mg, 485mg, 48Umg: 475mg. When checking, the machine should read the first degree as follows: 0.099, 0.098, 0.097, 0.096, 0.095 calibration method
appearance and mark inspection and reduction meet the requirements of the provisions of Section 6.1, .3.1
obtain the ten essential metrological performance results in accordance with the current benefit meter gold regulations service requirements. 73.2
7.3.3 Jian generation evaluation! 15 yards back to the difference of the calibration 3.3 days 7 base should be placed on the fixed workbench 1, will be 15 for the average, put 5 cars on the beam! No. S, half of the water in the bottom reservoir is washed, and the horizontal balance is 7.3.3.2. If the balance is not balanced, move 5 yards, and then the balance is balanced again. The difference will be 1 of the required amount. In order to put a single hammer on the top, the brick yard is used to measure the need for measurement. The quality of the balance must be carefully checked at the most. 7.3.5 The balance is carefully checked. t.1JG171·2004
When the balance is in equilibrium, gently hang a 5mm weight on the balance hook. The deviation of the static point of the balance should meet the requirements specified in Table 1.
7.3.6 Verification of relative density error caused by volume difference of measuring chain 7.3.6.1 Fill the measuring cylinder with water to an appropriate height and place a thermometer in the cylinder: read the temperature value of the water after 5 minutes
7.3.6, 2 Fully wash the measuring hammer and hanging wire, and put the whole set of Hang the measuring hammer on the hook, adjust it to make it balanced, then put the measuring hammer into the burning base, and check the bending of the measuring hammer and the residual wire. There should be no bubbles attached to the surrounding of the measuring hammer and the metal wire. 7.3.6.3 The difference in the density of hot water before and after the test should not exceed 0.5. 7.3.6.4 When the temperature of the distilled water during the test is greater than 219, its relative density value shall be calculated and corrected according to the following formula: + = + () || tt || Where: - relative density of distilled water at temperature; a - volume expansion coefficient of the glass material, taken as 0. 000025, gas\;1——the temperature of the test water,
7.3.6.5 Hang 5g of sodium weight or 4.5g of sodium weight and any one of 475mg~495mg of sodium weight (when the relative density is less than 1) on the hanger, and place appropriate weights on the concave part of the beam to balance it. According to the relative density value calculated by the hanging weight and the measured water retreat, make corrections according to formula (1). The result shall be compared with the relative density value listed in the appendix table. The difference between the two shall meet the requirements specified in Table 1. 7.3.7 Verification of cabinet density error caused by the spacing difference of horizontal scale divisions. 3.7.1 According to 7.3.6.5, when the horizontal beam is in balance, the position of the 5mg weight placed on the horizontal beam grid is used as the required position:
7.3.7,2 When the relative density is less than 1,
1) Remove the 5g weight from the hook and place it on the No. 9 groove. At the same time, place the 500mg weight on the hook to observe whether it is balanced. If it is not balanced, move the 500mg weight to balance. 2) Then move the 5g weight to the No. 8 groove, add another 500mg weight on the hook, and observe the balance. Verify the 7.6, 2, and 1 scale divisions in turn according to the above method, and compare the balance position of each groove with the zero position. The deviation from the zero position is the relative density error of each groove. It should meet the requirements specified in Table 1. 7.3.7.3 Under the condition of low relative density 1) Put the 5g weight on the hook and put it on the No. 9 concave bottle, and at the same time put the 50mg and 50m weights on the No. 4 concave bottle to check whether it is balanced. If it is unbalanced, move the 5m weight to make it balanced. 2) Put the 5g weight on the No. 8 concave bottle, and at the same time hang the 5t4mg weight on the hook: 5[XmB, 5/mg weight is still on the No. 9 concave bottle, and observe whether it is balanced: According to the above method, check the 7th, 6th, 2nd, and 1st graduation slots, and compare the balance position of each slot with the zero position. The deviation from the zero position is the relative error of each slot, which meets the requirements specified in Table 1. Www.bzxZ.net
7.3.4 The first batch of calibration should be checked one by one: 7.3 .7.5 For post-verification and inspection during use, only 1, 3, 5, 7, 9 can be inspected. 7.3.8: Verification of balance repeatability
Remove the 5 weights on the hook, move the beam and the hook ring back and forth times respectively, and then gently lift the beam down or up one position each time. The change in balance position each time should meet the requirements of Table 1. 6
Product k companion network bttn://www.7.3.9 Relative density error of the balance
JJG [71—20n4
The relative density error of the balance should meet the requirements of Table 1. 7.4 Processing of verification results
According to the provisions and requirements of this regulation, a verification certificate shall be issued to the qualified balance. The verification results of the qualified balance shall be notified at the time of verification, and the qualified items shall be noted. 7.5 Verification cycle
The verification cycle of the relative density balance of the filter is generally more than 1 year. 7
Food you k companion network httn.//uwrfoodmate.net Appendix A
Overflow ℃
J3G:171.-.2004
Comparison table of relative density of evaporated water at different temperatures (relative to 20℃)
Relative density
bttn:
Relative density
1,C0C4
1,0oom
/wwwfoodmatonet
Relative density
0,9977
0997614 Meter to standard and main accessories
F) Hygrometer
Read wall specification (0~50), minimum operating value is.29?: Special standard method set for verification
Table 4 Special standard method for verification
: Code
Nominal mass value
s00rmg
495alg
Mass display /ng
Note: The two balances are respectively marked with 495ms, 490mg, 485mg, 48Umg: 475mg. During the verification, the machine should be constant for the reading of the first degree is 0.099, 0,098, 0.097, 0.096, 0.095 calibration method
appearance and mark inspection reduction meet the requirements of the provisions of Section 6.1, .3.1
ten must be metrological performance results meet the requirements of the current benefit meter gold regulations. 73.2
7.3.3 Jian generation evaluation! 15 yards back to the difference of the verification of the 3.3 day 7 base should be placed on the fixed workbench 1, the 15 is the average, put the 5 cars on the beam! The first port of the S, the water in the bottom reservoir is half washed, so that the horizontal balance 7.3.3.2 will be about 15 yards, [each day, half of the balance position loan, if the balance is not balanced, move 5 yards, he balance to balance, the difference will be the original profit 1 required. In order to put a single hammer on the measurement, the brick weight is not used to replace the measurement. The quality of the balance must be measured carefully.
7.3.5 Balance recording careful inspection
foodmate.net httn.//wwwfoodmate.net.1JG171·2004
When the balance is in a balanced state, gently hang a 5mm weight on the balance hook, indicating that the deviation of the balance point should meet the table 1 Specified requirements
7.3.6 Verification of relative density error caused by volume difference of measuring chain 7.3.6.1 Fill the measuring cylinder with water to an appropriate height, and place a thermometer in the cylinder: read the temperature of the water after 5 minutes
7.3.6, 2 Fully wash the measuring hammer and the hanging wire, hang the whole set of measuring hammer on the hanging wire, adjust it to make it balanced, then put the measuring hammer into the filling book, and check the bending of the measuring hammer and the residual screen wire. There shall be no air bubbles on the metal wire. 7.3.6.3 The difference in the density of hot water before and after the test shall not exceed 5%. 7.3.6.4 When the temperature of the distilled water during the test is greater than 219°C, its relative density shall be corrected by the following formula: + = + () || tt || Where: - relative density of distilled water at a temperature of ; a - volume expansion coefficient of the test material, taken as 0.000025; 1 - temperature of the test water 7.3.6.5 Hang a 5g weight or a 4.5g sodium weight and any one of 475mg~495mg weights (when the relative density is less than 1) on the hanger, and place appropriate weights on the concave part of the beam to balance it. According to the relative density value calculated by the hanging weight and the measured water level, make corrections according to formula (1). The result shall be compared with the relative density value listed in the appendix table. The difference between the two shall meet the requirements specified in Table 1. 7.3.7 Verification of cabinet density error caused by the spacing difference of horizontal scale divisions. 3.7.1 According to 7.3.6.5, when the horizontal beam is in balance, the position of the 5mg weight placed on the horizontal beam grid is used as the required position:
7.3.7,2 When the relative density is less than 1,
1) Remove the 5g weight from the hook and place it on the No. 9 groove. At the same time, place the 500mg weight on the hook to observe whether it is balanced. If it is not balanced, move the 500mg weight to balance. 2) Then move the 5g weight to the No. 8 groove, add another 500mg weight on the hook, and observe the balance. Verify the 7.6, 2, and 1 scale divisions in turn according to the above method, and compare the balance position of each groove with the zero position. The deviation from the zero position is the relative density error of each groove. It should meet the requirements specified in Table 1. 7.3.7.3 Under the condition of low relative density 1) Put the 5g weight on the hook and put it on the No. 9 concave bottle, and at the same time put the 50mg and 50m weights on the No. 4 concave bottle to check whether it is balanced. If it is unbalanced, move the 5m weight to make it balanced. 2) Put the 5g weight on the No. 8 concave bottle, and at the same time hang the 5t4mg weight on the hook: 5[XmB, 5/mg weight is still on the No. 9 concave bottle, and observe whether it is balanced: According to the above method, check the 7th, 6th, 2nd, and 1st graduation slots, and compare the balance position of each slot with the zero position. The deviation from the zero position is the relative error of each slot, which meets the requirements specified in Table 1.
7.3.4 The first batch of calibration should be checked one by one: 7.3 .7.5 For post-verification and inspection during use, only 1, 3, 5, 7, 9 can be inspected. 7.3.8: Verification of balance repeatability
Remove the 5 weights on the hook, move the beam and the hook ring back and forth times respectively, and then gently lift the beam down or up one position each time. The change in balance position each time should meet the requirements of Table 1. 6
Product k companion network bttn://www.7.3.9 Relative density error of the balance
JJG [71—20n4
The relative density error of the balance should meet the requirements of Table 1. 7.4 Processing of verification results
According to the provisions and requirements of this regulation, a verification certificate shall be issued to the qualified balance. The verification results of the qualified balance shall be notified at the time of verification, and the qualified items shall be noted. 7.5 Verification cycle
The verification cycle of the relative density balance of the filter is generally more than 1 year. 7
Food you k companion network httn.//uwrfoodmate.net Appendix A
Overflow ℃
J3G:171.-.2004
Comparison table of relative density of evaporated water at different temperatures (relative to 20℃)
Relative density
bttn:
Relative density
1,C0C4
1,0oom
/wwwfoodmatonet
Relative density
0,9977
0997614 Meter to standard and main accessories
F) Hygrometer
Read wall specification (0~50), minimum operating value is.29?: Special standard method set for verification
Table 4 Special standard method for verification
: Code
Nominal mass value
s00rmg
495alg
Mass display /ng
Note: The two balances are respectively marked with 495ms, 490mg, 485mg, 48Umg: 475mg. During the verification, the machine should be constant for the reading of the first degree is 0.099, 0,098, 0.097, 0.096, 0.095 calibration method
appearance and mark inspection reduction meet the requirements of the provisions of Section 6.1, .3.1
ten must be metrological performance results meet the requirements of the current benefit meter gold regulations. 73.2
7.3.3 Jian generation evaluation! 15 yards back to the difference of the verification of the 3.3 day 7 base should be placed on the fixed workbench 1, the 15 is the average, put the 5 cars on the beam! The first port of the S, the water in the bottom reservoir is half washed, so that the horizontal balance 7.3.3.2 will be about 15 yards, [each day, half of the balance position loan, if the balance is not balanced, move 5 yards, he balance to balance, the difference will be the original profit 1 required. In order to put a single hammer on the measurement, the brick weight is not used to replace the measurement. The quality of the balance must be measured carefully.
7.3.5 Balance recording careful inspection
foodmate.net httn.//wwwfoodmate.net.1JG171·2004
When the balance is in a balanced state, gently hang a 5mm weight on the balance hook, indicating that the deviation of the balance point should meet the table 1 Specified requirements
7.3.6 Verification of relative density error caused by volume difference of measuring chain 7.3.6.1 Fill the measuring cylinder with water to an appropriate height, and place a thermometer in the cylinder: read the temperature of the water after 5 minutes
7.3.6, 2 Fully wash the measuring hammer and the hanging wire, hang the whole set of measuring hammer on the hanging wire, adjust it to make it balanced, then put the measuring hammer into the filling book, and check the bending of the measuring hammer and the residual screen wire. There shall be no air bubbles on the metal wire. 7.3.6.3 The difference in the density of hot water before and after the test shall not exceed 5%. 7.3.6.4 When the temperature of the distilled water during the test is greater than 219°C, its relative density shall be corrected by the following formula: + = + () || tt || Where: - relative density of distilled water at a temperature of ; a - volume expansion coefficient of the test material, taken as 0.000025; 1 - temperature of the test water 7.3.6.5 Hang a 5g weight or a 4.5g sodium weight and any one of 475mg~495mg weights (when the relative density is less than 1) on the hanger, and place appropriate weights on the concave part of the beam to balance it. According to the relative density value calculated by the hanging weight and the measured water level, make corrections according to formula (1). The result shall be compared with the relative density value listed in the appendix table. The difference between the two shall meet the requirements specified in Table 1. 7.3.7 Verification of cabinet density error caused by the spacing difference of horizontal scale divisions. 3.7.1 According to 7.3.6.5, when the horizontal beam is in balance, the position of the 5mg weight placed on the horizontal beam grid is used as the required position:
7.3.7,2 When the relative density is less than 1,
1) Remove the 5g weight from the hook and place it on the No. 9 groove. At the same time, place the 500mg weight on the hook to observe whether it is balanced. If it is not balanced, move the 500mg weight to balance. 2) Then move the 5g weight to the No. 8 groove, add another 500mg weight on the hook, and observe the balance. Verify the 7.6, 2, and 1 scale divisions in turn according to the above method, and compare the balance position of each groove with the zero position. The deviation from the zero position is the relative density error of each groove. It should meet the requirements specified in Table 1. 7.3.7.3 Under the condition of low relative density 1) Put the 5g weight on the hook and put it on the No. 9 concave bottle, and at the same time put the 50mg and 50m weights on the No. 4 concave bottle to check whether it is balanced. If it is unbalanced, move the 5m weight to make it balanced. 2) Put the 5g weight on the No. 8 concave bottle, and at the same time hang the 5t4mg weight on the hook: 5[XmB, 5/mg weight is still on the No. 9 concave bottle, and observe whether it is balanced: According to the above method, check the 7th, 6th, 2nd, and 1st graduation slots, and compare the balance position of each slot with the zero position. The deviation from the zero position is the relative error of each slot, which meets the requirements specified in Table 1.
7.3.4 The first batch of calibration should be checked one by one: 7.3 .7.5 For post-verification and inspection during use, only 1, 3, 5, 7, 9 can be inspected. 7.3.8: Verification of balance repeatability
Remove the 5 weights on the hook, move the beam and the hook ring back and forth times respectively, and then gently lift the beam down or up one position each time. The change in balance position each time should meet the requirements of Table 1. 6
Product k companion network bttn://www.7.3.9 Relative density error of the balance
JJG [71—20n4
The relative density error of the balance should meet the requirements of Table 1. 7.4 Processing of verification results
According to the provisions and requirements of this regulation, a verification certificate shall be issued to the qualified balance. The verification results of the qualified balance shall be notified at the time of verification, and the qualified items shall be noted. 7.5 Verification cycle
The verification cycle of the relative density balance of the filter is generally more than 1 year. 7
Food you k companion network httn.//uwrfoodmate.net Appendix A
Overflow ℃
J3G:171.-.2004
Comparison table of relative density of evaporated water at different temperatures (relative to 20℃)
Relative density
bttn:
Relative density
1,C0C4
1,0oom
/wwwfoodmatonet
Relative density
0,9977
0997615g sodium weight and any one of 475mg~495mg weight (when relative density is less than 1) are hung on the hook, and appropriate weights are placed on the concave groove of the crossbeam to balance it. According to the relative density value calculated by the hanging weight and the measured water level, it is corrected according to formula (1). The result is compared with the relative density value listed in the appendix table. The difference between the two should meet the requirements specified in Table 1. 7.3.7 Verification of cabinet density error caused by the difference in spacing between horizontal scales. 3.7.1 According to 7.3.6.5, when the crossbeam is in balance, the 5mg weight is placed at the position of the crossbeam grid and this is used as the required position:
7.3.7,2 When the relative density is less than 1
1) Remove the 5g weight on the hook and place it on the No. 9 groove. At the same time, place the 500mg weight on the hook and observe whether it is balanced. If it is not balanced, move the 500mg weight to balance it. 2) Then move the 5g weight to the No. 8 groove, and add a 5M1mg weight to the hook to check for balance. According to the above method, check the 7, 6, 2, and 1 scale phases in turn, and compare the balance position of each groove with the zero position. The deviation from the zero position is the relative error of each groove. It should meet the requirements specified in Table 1. 7.3.7.3 Under the condition of low relative density 1) Move the 5g weight on the hook to the No. 9 groove, and at the same time, place the 50mg and 50m weights on the No. 4 groove to check for balance. If it is unbalanced, move the 5m weight to make it balanced. 2) Place the 5g weight on the 8th notch, and at the same time place the 5tM)mg weight on the notch: 5[XmB, 5/mg weight is still placed on the 9th notch, observe the following: According to the above method, check the 7th, 6th, 2nd, and 1st graduation notches, compare the position of each notch with the zero position, and the deviation from the zero position is the relative error of each notch, which meets the requirements specified in Table 1.
7.3.4 The first notch should be checked one by one during the first flow check: 7.3 .7.5 For post-verification and inspection during use, only 1, 3, 5, 7, 9 can be inspected. 7.3.8: Verification of balance repeatability
Remove the 5 weights on the hook, move the beam and the hook ring back and forth times respectively, and then gently lift the beam down or up one position each time. The change in balance position each time should meet the requirements of Table 1. 6
Product k companion network bttn://www.7.3.9 Relative density error of the balance
JJG [71—20n4
The relative density error of the balance should meet the requirements of Table 1. 7.4 Processing of verification results
According to the provisions and requirements of this regulation, a verification certificate shall be issued to the qualified balance. The verification results of the qualified balance shall be notified at the time of verification, and the qualified items shall be noted. 7.5 Verification cycle
The verification cycle of the relative density balance of the filter is generally more than 1 year. 7
Food you k companion network httn.//uwrfoodmate.net Appendix A
Overflow ℃
J3G:171.-.2004
Comparison table of relative density of evaporated water at different temperatures (relative to 20℃)
Relative density
bttn:
Relative density
1,C0C4
1,0oom
/wwwfoodmatonet
Relative density
0,9977
0997615g sodium weight and any one of 475mg~495mg weight (when relative density is less than 1) are hung on the hook, and appropriate weights are placed on the concave groove of the crossbeam to balance it. According to the relative density value calculated by the hanging weight and the measured water level, it is corrected according to formula (1). The result is compared with the relative density value listed in the appendix table. The difference between the two should meet the requirements specified in Table 1. 7.3.7 Verification of cabinet density error caused by the difference in spacing between horizontal scales. 3.7.1 According to 7.3.6.5, when the crossbeam is in balance, the 5mg weight is placed at the position of the crossbeam grid and this is used as the required position:
7.3.7,2 When the relative density is less than 1
1) Remove the 5g weight on the hook and place it on the No. 9 groove. At the same time, place the 500mg weight on the hook and observe whether it is balanced. If it is not balanced, move the 500mg weight to balance it. 2) Then move the 5g weight to the No. 8 groove, and add a 5M1mg weight to the hook to check for balance. According to the above method, check the 7, 6, 2, and 1 scale phases in turn, and compare the balance position of each groove with the zero position. The deviation from the zero position is the relative error of each groove. It should meet the requirements specified in Table 1. 7.3.7.3 Under the condition of low relative density 1) Move the 5g weight on the hook to the No. 9 groove, and at the same time, place the 50mg and 50m weights on the No. 4 groove to check for balance. If it is unbalanced, move the 5m weight to make it balanced. 2) Place the 5g weight on the 8th notch, and at the same time place the 5tM)mg weight on the notch: 5[XmB, 5/mg weight is still placed on the 9th notch, observe the following: According to the above method, check the 7th, 6th, 2nd, and 1st graduation notches, compare the position of each notch with the zero position, and the deviation from the zero position is the relative error of each notch, which meets the requirements specified in Table 1.
7.3.4 The first notch should be checked one by one during the first flow check: 7.3 .7.5 For post-verification and inspection during use, only 1, 3, 5, 7, 9 can be inspected. 7.3.8: Verification of balance repeatability
Remove the 5 weights on the hook, move the beam and the hook ring back and forth times respectively, and then gently lift the beam down or up one position each time. The change in balance position each time should meet the requirements of Table 1. 6
Product k companion network bttn://www.7.3.9 Relative density error of the balance
JJG [71—20n4
The relative density error of the balance should meet the requirements of Table 1. 7.4 Processing of verification results
According to the provisions and requirements of this regulation, a verification certificate shall be issued to the qualified balance. The verification results of the qualified balance shall be notified at the time of verification, and the qualified items shall be noted. 7.5 Verification cycle
The verification cycle of the relative density balance of the filter is generally more than 1 year. 7
Food you k companion network httn.//uwrfoodmate.net Appendix A
Overflow ℃
J3G:171.-.2004
Comparison table of relative density of evaporated water at different temperatures (relative to 20℃)
Relative density
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Relative density
1,C0C4
1,0oom
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Relative density
0,9977
099761
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