Some standard content:
National Metrology Verification Regulations of the People's Republic of China JJG20—2001
Standard Capacity Measures (glass)2001-11-30 Issued
2002-03-01 Implementation
Issued by the General Administration of Quality Supervision, Inspection and Quarantine16
Clause 4
Clause 5
JIG20—2001 Errata
Specific steps of verification method
Should be in accordance with 5.4.1.1
5.4.1.4 Implementation
Specific steps of verification method
Should be in accordance with 6.3.1
6.3.3.4 Implementation
Verification results should be in accordance with 5.5.iVerification results should be judged in accordance with 6.4
LIG 20—2001
Verification Regulation of Standard Capacity Measures (glass）
JJG20—2001
Replaces JJG 20—1989
This regulation was approved by the General Administration of Quality Supervision, Inspection and Quarantine on November 30, 2001, and came into force on March 1, 2002.
Responsible unit: National Technical Committee on Flow and Capacity Measurement Main drafting unit: China National Institute of Metrology Participating unit: Shanghai Institute of Metrology and Testing This regulation is entrusted to the National Technical Committee on Flow and Capacity Measurement to be responsible for the interpretation of this regulation Main drafter:
Participating drafter:
Zhang Hongya
J.IG20--2001
(China National Institute of Metrology)
(Shanghai Institute of Metrology and Testing Technology)
(China National Institute of Metrology)
2References·
3References·
3. 2 Specifications and types
3.3 Modeling and size
4 Technical requirements
4. Physical and chemical properties of materials
4.2 Appearance requirements
4.3 Determination of meniscus
5 Metrological performance requirements
5.1 Flow rate of standard glass measuring instruments
5.2 Allowable error of standard glass measuring instruments
6 Control of measuring instruments
6.1 Verification conditions
6.2 Verification items
Verification methods
6.4 Processing of verification results
6.5 Verification cycle
J.JG 20—2001
Gradually record A. Verification of second-class standard glass measuring instruments by weighing method Appendix B
Appendix C
Structural dimensions of standard glass measuring instruments
Standard glass measuring instruments by weighing method K() value table
Appendix L. Verification record of standard glass base instruments
1 Scope
JJG 20-—200
Verification procedure for standard glass measuring instruments
This procedure applies to the initial verification and subsequent verification of newly manufactured and in-use standard glass measuring instruments. 2 References
National Standard GB6682-1986 "Experimental Water Specifications" National Standard GB/T15726-1995 "Test Methods for Internal Stress in Glass Instruments" 3 Overview
3.1 Purpose
Polarized Light Measurement Method"
Standard glass instruments are working standards for transmitting volume values, divided into first and second grades: first-class standard glass measuring instruments are used to calibrate standard glass measuring instruments, Class A burettes, Class A volumetric flasks, Class A graduated pipettes and Class A single-line pipettes. First-class standard glass indicators are used to calibrate common glass measuring instruments, drinking measuring instruments, special glass measuring syringes and various specifications and models of fixed-volume filling machines and other working measuring instruments. 3.2 Specifications and Types
For the specifications and types of standard glass measuring vessels, see Table 2 and Table 3.3 Modeling and Dimensions
For standard glass measuring vessels with a nominal capacity of 100 mL (including 100 mL) or less, the main body shall be made into a round shape. For standard glass measuring vessels with a nominal capacity of 100 mL or more, the main body shall be made into a round shape. The water inlet end of the connecting rod of the first-class standard glass measuring vessel shall be made into a standard ground mouth for connecting the piston: the measuring bottle type standard glass measuring vessel shall be made into a volumetric bottle type. Its main structure and dimensions are shown in Appendix B.
Table 1 Type, purpose and nominal capacity of first-class standard glass measuring instruments Type
FXB type
DXB type
Straight tube type
Used to calibrate second-class standard glass measuring instruments
Used to calibrate Class A lubricating tubes
Used to calibrate Class A volumetric flasks
Used to calibrate Class A graduated pipettes
Used to calibrate Class A single-marked pipettes
Used to calibrate second-class standard glass measuring instruments
Nominal capacity
0.05,0.1,0.125,0.2,0.25,0.5,1,2,2.5,3,5. 10, 12.5. 15, 20, 25, 37.5, 50, 75, 100, 200250,500,1 000
0.5,1,2,2.5.5,10,15.20.25,30,40,50,60,80，100
1,2.5.10.25,50,100,200,250,500,10000.1, 0.2, 0.5, 1, 2.2.5,5,10,12.5, 25, 501, 2,3, 5.10,15, 20, 25, 50. 1000.10,0.24
Half head type
Pointed plastic
Volume bottle type
JJG 20—2001
Table 2 Types, uses and nominal capacities of second-class standard glass measuring instruments Used for verification of Class B glass measuring instruments (titration, separation, nominal capacity
0.05, 0.10.125, 0.2.0.25, 0.5, 1, 2, 2.5, degree pipettes, single-marked pipettes and glass is 3, 5, 1012.5, 15, 20, 25, 37.5, 50, 75, points)
Verify single-line volumetric bottles
Verify Jiang ejector
Verify Omin pipette
Verify glass measuring instruments (calibrated centrifuge tubes, graduated test tubes, blood vessels, digestive tubes, colorimetric tubes, etc.)
Verify measuring cylinders and measuring cups
Verify quantitative extraction, drinking measuring instruments, filling machines
4 General technical requirements
4.1 Material and physical and chemical properties
100, 200, 250. 500,1 000
1.2,5,10.25,50,100,200,250,500,10.2 00 | | tt | + 4 + 5. 2 + 8 - 10.2.5 + 10 + 12.5, 5 + 20 + 25, 10 + 40 + 50, 25 +100+125, 20+110+120,200, 400,500,800,1000
10, 20, 25, 30, 40, 50,100.150, 200, 250.300.330,350,400,450,500,600,650,750.1 000, 1 250, 1 500, 2 000, 2 500, 3 000,4000,5000，10000
4.1.1 Standard glass measuring instrument is made of colorless and transparent borosilicate glass; 4.1.2 Water resistance shall not be lower than Grade 1;
4.1.3 Residual internal stress ≤ 80nm/em optical path difference. 4.1.4 The linear expansion coefficient of glass (within the range of 20~300℃) shall not be greater than 3.3×10-\/%. 4.2 Appearance requirements
4.2.1 The appearance defects of standard glassware should not affect the measurement and observation of the liquid level. For specific requirements, see Table 3. Table 3 Technical requirements for the appearance of standard glass measuring instruments Defect Name
Appearance requirements
It is not allowed to have bubbles, dense bubbles, and gas pools with a width greater than 3mm. It is not allowed to have gas lines.
It is not allowed to have people with a width greater than 0.5 mm stones
are not allowed to have water accumulation or palpable bumps. The main body and the upper and lower capillaries and the bottle should be connected smoothly, without water accumulation and local thickening. JJG 20-2 (H01
4.2.3 The scale line of the nominal volume and the tolerance line of the measuring instrument are encircled: the length of the graduation line of the measuring bottle type standard glass is not less than 3 il, and the line width is not more than 0.2 mm, and should be clear and durable. 4.2.4 The corresponding tolerance numbers should be marked on the right side of the tolerance line = 4.2.5 The main body of the standard glass measuring vessel should have the following markings (see Figure 1): license mark M, manufacturer or trademark, standard temperature (20), specification model, nominal volume/mL: outflow time/s, waiting time/s, instrument number: trade name
waiting time
flow between countries xXs
acquisition time
Figure 1 Standard glass measuring vessel marking
4.2.6 The marking of the standard glass measuring vessel of the volumetric bottle type shall comply with the requirements of 4.2.5, and shall also have the marking of the measuring type (m) or the measuring type (Ex).
4.2.7 The standard glass measuring vessel used for non-potable liquids must be engraved with the words "For non-potable liquids" on the bottle: 4.2.8 The pistons of various types used to calibrate the glass measuring vessel shall not be leaking. 4.3 Method for determining the meniscus
The meniscus refers to the interface between the liquid in the measuring vessel and the air. It should be adjusted as follows: the lowest point of the transparent liquid meniscus should be tangent to the horizontal plane of the edge of the scale line, and the horizontal line should be at the same level as the upper edge of the scale line; the highest point of the mercury meniscus should be tangent to the water surface at the lower edge of the scale line, that is, when using opaque liquids, the line of sight should pass horizontally through the upper edge of the curved surface. Proper adjustment of the light can make the meniscus dark and the outline clear. For this purpose, it should be lined with a white background and stray light should be blocked. For example, a black paper tape or a cut piece of paper can be placed no more than 1 mm below the liquid level of the glass measuring instrument. The thick black rubber tube is put on the wall of the glass measuring vessel. When the engraved line of the measuring vessel is a bad line, the line of sight should be at the position where the front and rear parts of the engraved line edge overlap! , which can avoid parallax; when the engraved line of the measuring vessel is not a ring line, a black light-shielding tape can be used to line the back of the measuring vessel to make the engraved line clear, and the parallax at this time can be ignored. However, it should be noted that the eyes and the upper edge of the engraved line should be in the same horizontal plane to read the value. 3
Measuring performance requirements
Flow rate of standard glass measuring vessel
JJG 202001
The outflow time of various standard glass measuring vessels should be strictly controlled according to the provisions in Table 4 and Table 5. Table 4 Outflow time and waiting time of first-class standard glass measuring vessels Outflow waiting
Specification model
1B-15
RH-200
RB-250
RB-50)
RB-1000
FXR-1O
FXB-25
FXB-50
Hand-checked
Medium cup standard electric
Capacity/ml.
Inch/
Specification model
LB-20
DR-40
DB - 50
DB-100
LB - 200
LB-250
LB-500
TB - 1000
TIXB-1
DXB - 2bZxz.net
DXB-10
TIXR-15||tt| |I1XB- 20
DXB-25
DXB-S0
DXB-100
Capacity/mL
Calibrating
A corrugated tube
About testing
Inspect by hand
Grading single mark line suction
Time/s
Time/5
Capacity/mL
JIG 20-—2001
Outflow time and waiting time of second-class standard glassware
Time/s
Standard volume/ml
0.5 +2+2.5
2+8+10
2.5 + 10 + 12.5
5 + 20 + 25
10+40+50
25 + 100 ± 125
Time!
The outflow time of the standard glass measuring instrument with special capacity shall be determined by referring to the outflow time of the standard glass measuring instrument with similar capacity in Table 4 and Table 5. 5.1.2
5.2 Allowable error of standard glass measuring instrument
5.2.1 The nominal capacity tolerance of the standard glass measuring instrument shall be 1/3 to 1/5 of the capacity tolerance of the glass measuring instrument to be tested: the capacity tolerance range of each type of standard glass measuring instrument is shown in Table 6 and Table 7. 5.2.2 The capacity tolerance of the upper tolerance line of the standard glass measuring instrument shall not exceed the tolerance limit of the measuring instrument to be tested. 5
Specification model
RR-5
RR-5
RR- 10
RB- 50
Nominal capacity
JJG20-—2001
First-class standard glass container capacity tolerance table
Allowable error
Specification model
RB - 100
RB-100
RB-100
RB~ 100
RB-100
RB-100
RH- 200
RR-200
Nominal capacity
RB- 200
RR-200
HB-250
HB- 250
RB-250
RB-250
RB-250
RB-250
RB-500
RR-500
RB -500
RB-500
RB-500
RB-1000
RB-1000
RB-- 1000
RB-1000
RR- 2000 | | tt | RR-2500 ||tt | 10
B - 50
DB - 60
DB - 80
DR - 100
Nominal capacity
.5.000m
JJG 20—2001
Table 6 (continued)
Allowable error
（±）
：250
Specification model
IB -- 10
LB- 25
LB- 50
LB-100
LB-200
LB- s00
- 1000
LB+ 2000
FXB-10
FXB- 12.5
FXH - 25
FXB-50
DXB - 2
DXB - 3
DXB 10
DXB - 15
DXB- 20
IXB-25
DXB-50
T>XB-100
Nominal wear
Allowable error
.0.0505 The following markings shall be on the body of the standard glass measuring vessel (see Figure 1): license mark M, manufacturer or trademark, standard temperature (20), specification model, nominal volume/mL: outflow time/s, waiting time/s, instrument number: Trademark
Waiting time
Flow between countries
Obtained time》
Figure 1 Marking of standard glass measuring vessels
4.2.6 The marking of the standard glass measuring vessel of the volumetric bottle type shall meet the requirements of 4.2.5 and shall also have the marking of the measuring type (m) or the measuring type (Ex).
4.2.7 The standard glass measuring vessel used for non-drinking liquids must be engraved with the words "For non-drinking liquids" on the bottle: 4.2.8 The pistons of various types used for calibrating glass measuring vessels shall not be leaking. 4.3 Method for determining the meniscus
The meniscus refers to the interface between the liquid and the air in the measuring vessel. It should be adjusted as follows: the lowest point of the transparent liquid meniscus should be tangent to the horizontal plane of the edge of the scale line, and the horizontal line should be at the same level as the upper edge of the scale line; the highest point of the mercury meniscus should be tangent to the water surface of the lower edge of the scale line, that is, when using opaque liquid, the line of sight should pass horizontally through the upper edge of the curved surface. Proper adjustment of the light can make the crescent dark and the outline clear. For this purpose, it should be lined with white as the background and block out stray light. For example, a black paper tape or a cut black thick rubber tube can be placed on the wall of the glass measuring vessel at a position not more than 1mm below the positioning liquid level of the glass measuring vessel. When the scale line of the measuring vessel is a bad line, the line of sight should be at the position where the front and rear parts of the scale line edge overlap! , which can avoid parallax; when the scale line of the measuring vessel is not a ring line, a black light-shielding tape can be used to line the back of the measuring vessel to make the scale line clear, and the parallax at this time can be ignored. However, it should be noted that the eye and the upper edge of the scale line should be in the same horizontal plane for reading. 3
Metrological performance requirements
Flow rate of standard glass measuring vessels
JJG 202001
The outflow time of various standard glass measuring vessels should be strictly controlled as specified in Tables 4 and 5. Table 4 Outflow time and waiting time of first-class standard glass measuring vessel Outflow waiting time
Specification model
1B-15
RH-200
RB-250
RB-50)
RB-1000
FXR-1O
FXB-25
FXB-50
Hand-checked
Medium cup standard electric
Capacity/ml.
Inch/
Specification model
LB-20
DR-40
DB-50
DB-100
LB- 200
LB-250
LB-500
TB - 1000
TIXB-1
DXB - 2
DXB - 3
DXB- 10
TIXR-15
I1XB- 20
DXB-25
DXB-S0
DXB-100
Capacity/mL
Down-calibration
A wrinkled tube
For A-level inspection
By hand inspection
Grading single mark line suction
Time/s
Time/5
Capacity/mL
JIG 20-—2001
Outflow time and waiting time of second-class standard glasswareFlow time/s
Standard volume/ml
0.5 +2+2.5
2+8+10
2.5 + 10 + 12.5
5 + 20 + 25
10+40+50
25 + 100 ± 125
Time!
The outflow time of standard glassware with special capacity can be determined by referring to the outflow time of standard glassware with similar capacity in Table 4 and Table 5.5.1.2.
5.2 Allowable error of standard glass measuring instruments
5.2.1 The nominal capacity tolerance of a standard glass measuring instrument shall be 1/3 to 1/5 of the capacity tolerance of the glass measuring instrument being tested: the capacity tolerance ranges of various types of standard glass measuring instruments are shown in Tables 6 and 7. 5.2.2 The capacity tolerance of the upper tolerance line of a standard glass measuring instrument shall not exceed the tolerance limit of the measuring instrument being tested. 5
Specification model
RR-5
RR-5
RR- 10
RB- 50
Nominal capacity
JJG20-—2001
First-class standard glass container capacity tolerance table
Allowable error
Specification model
RB - 100
RB-100
RB-100
RB~ 100
RB-100
RB-100
RH- 200
RR-200
Nominal capacity
RB- 200
RR-200
HB-250
HB- 250
RB-250
RB-250
RB-250
RB-250
RB-500
RR-500
RB -500
RB-500
RB-500
RB-1000
RB-1000
RB-- 1000
RB-1000
RR- 2000 | | tt | RR-2500 ||tt | 10
B - 50
DB - 60
DB - 80
DR - 100
Nominal capacity
.5.000m
JJG 20—2001
Table 6 (continued)
Allowable error
（±）
：250
Specification model
IB -- 10
LB- 25
LB- 50
LB-100
LB-200
LB- s00
- 1000
LB+ 2000
FXB-10
FXB- 12.5
FXH - 25
FXB-50
DXB - 2
DXB - 3
DXB 10
DXB - 15
DXB- 20
IXB-25
DXB-50
T>XB-100
Nominal wear
Allowable error
.0.0505 The following markings shall be on the body of the standard glass measuring vessel (see Figure 1): license mark M, manufacturer or trademark, standard temperature (20), specification model, nominal volume/mL: outflow time/s, waiting time/s, instrument number: Trademark
Waiting time
Flow between countries
Obtained time》
Figure 1 Marking of standard glass measuring vessels
4.2.6 The marking of the standard glass measuring vessel of the volumetric bottle type shall meet the requirements of 4.2.5 and shall also have the marking of the measuring type (m) or the measuring type (Ex).
4.2.7 The standard glass measuring vessel used for non-drinking liquids must be engraved with the words "For non-drinking liquids" on the bottle: 4.2.8 The pistons of various types used for calibrating glass measuring vessels shall not be leaking. 4.3 Method for determining the meniscus
The meniscus refers to the interface between the liquid and the air in the measuring vessel. It should be adjusted as follows: the lowest point of the transparent liquid meniscus should be tangent to the horizontal plane of the edge of the scale line, and the horizontal line should be at the same level as the upper edge of the scale line; the highest point of the mercury meniscus should be tangent to the water surface of the lower edge of the scale line, that is, when using opaque liquid, the line of sight should pass horizontally through the upper edge of the curved surface. Proper adjustment of the light can make the crescent dark and the outline clear. For this purpose, it should be lined with white as the background and block out stray light. For example, a black paper tape or a cut black thick rubber tube can be placed on the wall of the glass measuring vessel at a position not more than 1mm below the positioning liquid level of the glass measuring vessel. When the scale line of the measuring vessel is a bad line, the line of sight should be at the position where the front and rear parts of the scale line edge overlap! , which can avoid parallax; when the scale line of the measuring vessel is not a ring line, a black light-shielding tape can be used to line the back of the measuring vessel to make the scale line clear, and the parallax at this time can be ignored. However, it should be noted that the eye and the upper edge of the scale line should be in the same horizontal plane for reading. 3
Metrological performance requirements
Flow rate of standard glass measuring vessels
JJG 202001
The outflow time of various standard glass measuring vessels should be strictly controlled as specified in Tables 4 and 5. Table 4 Outflow time and waiting time of first-class standard glass measuring vessel Outflow waiting time
Specification model
1B-15
RH-200
RB-250
RB-50)
RB-1000
FXR-1O
FXB-25
FXB-50
Hand-checked
Medium cup standard electric
Capacity/ml.
Inch/
Specification model
LB-20
DR-40
DB-50
DB-100
LB- 200
LB-250
LB-500
TB - 1000
TIXB-1
DXB - 2
DXB - 3
DXB- 10
TIXR-15
I1XB- 20
DXB-25
DXB-S0
DXB-100
Capacity/mL
Down-calibration
A wrinkled tube
For A-level inspection
By hand inspection
Grading single mark line suction
Time/s
Time/5
Capacity/mL
JIG 20-—2001
Outflow time and waiting time of second-class standard glasswareFlow time/s
Standard volume/ml
0.5 +2+2.5
2+8+10
2.5 + 10 + 12.5
5 + 20 + 25
10+40+50
25 + 100 ± 125
Time!
The outflow time of standard glassware with special capacity can be determined by referring to the outflow time of standard glassware with similar capacity in Table 4 and Table 5.5.1.2.
5.2 Allowable error of standard glass measuring instruments
5.2.1 The nominal capacity tolerance of a standard glass measuring instrument shall be 1/3 to 1/5 of the capacity tolerance of the glass measuring instrument being tested: the capacity tolerance ranges of various types of standard glass measuring instruments are shown in Tables 6 and 7. 5.2.2 The capacity tolerance of the upper tolerance line of a standard glass measuring instrument shall not exceed the tolerance limit of the measuring instrument being tested. 5
Specification model
RR-5
RR-5
RR- 10
RB- 50
Nominal capacity
JJG20-—2001
First-class standard glass container capacity tolerance table
Allowable error
Specification model
RB - 100
RB-100
RB-100
RB~ 100
RB-100
RB-100
RH- 200
RR-200
Nominal capacity
RB- 200
RR-200
HB-250
HB- 250
RB-250
RB-250
RB-250
RB-250
RB-500
RR-500
RB -500
RB-500
RB-500
RB-1000
RB-1000
RB-- 1000
RB-1000
RR- 2000 | | tt | RR-2500 ||tt | 10
B - 50
DB - 60
DB - 80
DR - 100
Nominal capacity
.5.000m
JJG 20—2001
Table 6 (continued)
Allowable error
（±）
：250
Specification model
IB -- 10
LB- 25
LB- 50
LB-100
LB-200
LB- s00
- 1000
LB+ 2000
FXB-10
FXB- 12.5
FXH - 25
FXB-50
DXB - 2
DXB - 3
DXB 10
DXB - 15
DXB- 20
IXB-25
DXB-50
T>XB-100
Nominal wear
Allowable error
.0.0503 Method for determining the meniscus
The meniscus refers to the interface between the liquid and the air in the measuring instrument. It should be adjusted as follows: the lowest point of the transparent liquid meniscus should be tangent to the horizontal plane of the edge of the scale line, and the horizontal line should be at the same level as the upper edge of the scale line; the highest point of the mercury meniscus should be tangent to the water surface at the lower edge of the scale line, that is, when using opaque liquid, the line of sight should pass horizontally through the upper edge of the meniscus. Proper adjustment of the light can make the meniscus dark and clear in outline. For this purpose, it should be lined with white as the background and block out stray light. For example, a black paper tape or a cut black thick rubber tube can be placed on the wall of the glass measuring instrument at a position not more than 1mm below the positioning liquid level of the glass measuring instrument. When the scale line of the measuring instrument is a bad line, the line of sight should be at the position where the front and rear parts of the scale line edge overlap! , which can avoid parallax; when the scale line of the measuring instrument is not a ring line, a black light-shielding tape can be used to line the back of the measuring instrument to make the scale line clear, and the parallax at this time can be ignored. However, it should be noted that the eye and the upper edge of the scale line should be in the same horizontal plane for reading. 3
Metrological performance requirements
Flow rate of standard glass measuring vessels
JJG 202001
The outflow time of various standard glass measuring vessels should be strictly controlled as specified in Tables 4 and 5. Table 4 Outflow time and waiting time of first-class standard glass measuring vessel Outflow waiting time
Specification model
1B-15
RH-200
RB-250
RB-50)
RB-1000
FXR-1O
FXB-25
FXB-50
Hand-checked
Medium cup standard electric
Capacity/ml.
Inch/
Specification model
LB-20
DR-40
DB-50
DB-100
LB- 200
LB-250
LB-500
TB - 1000
TIXB-1
DXB - 2
DXB - 3
DXB- 10
TIXR-15
I1XB- 20
DXB-25
DXB-S0
DXB-100
Capacity/mL
Down-calibration
A wrinkled tube
For A-level inspection
By hand inspection
Grading single mark line suction
Time/s
Time/5
Capacity/mL
JIG 20-—2001
Outflow time and waiting time of second-class standard glasswareFlow time/s
Standard volume/ml
0.5 +2+2.5
2+8+10
2.5 + 10 + 12.5
5 + 20 + 25
10+40+50
25 + 100 ± 125
Time!
The outflow time of standard glassware with special capacity can be determined by referring to the outflow time of standard glassware with similar capacity in Table 4 and Table 5.5.1.2.
5.2 Allowable error of standard glass measuring instruments
5.2.1 The nominal capacity tolerance of a standard glass measuring instrument shall be 1/3 to 1/5 of the capacity tolerance of the glass measuring instrument being tested: the capacity tolerance ranges of various types of standard glass measuring instruments are shown in Tables 6 and 7. 5.2.2 The capacity tolerance of the upper tolerance line of a standard glass measuring instrument shall not exceed the tolerance limit of the measuring instrument being tested. 5
Specification model
RR-5
RR-5
RR- 10
RB- 50
Nominal capacity
JJG20-—2001
First-class standard glass container capacity tolerance table
Allowable error
Specification model
RB - 100
RB-100
RB-100
RB~ 100
RB-100
RB-100
RH- 200
RR-200
Nominal capacity
RB- 200
RR-200
HB-250
HB- 250
RB-250
RB-250
RB-250
RB-250
RB-500
RR-500
RB -500
RB-500
RB-500
RB-1000
RB-1000
RB-- 1000
RB-1000
RR- 2000 | | tt | RR-2500 ||tt | 10
B - 50
DB - 60
DB - 80
DR - 100
Nominal capacity
.5.000m
JJG 20—2001
Table 6 (continued)
Allowable error
（±）
：250
Specification model
IB -- 10
LB- 25
LB- 50
LB-100
LB-200
LB- s00
- 1000
LB+ 2000
FXB-10
FXB- 12.5
FXH - 25
FXB-50
DXB - 2
DXB - 3
DXB 10
DXB - 15
DXB- 20
IXB-25
DXB-50
T>XB-100
Nominal wear
Allowable error
.0.0503 Method for determining the meniscus
The meniscus refers to the interface between the liquid and the air in the measuring instrument. It should be adjusted as follows: the lowest point of the transparent liquid meniscus should be tangent to the horizontal plane of the edge of the scale line, and the horizontal line should be at the same level as the upper edge of the scale line; the highest point of the mercury meniscus should be tangent to the water surface at the lower edge of the scale line, that is, when using opaque liquid, the line of sight should pass horizontally through the upper edge of the meniscus. Proper adjustment of the light can make the meniscus dark and clear in outline. For this purpose, it should be lined with white as the background and block out stray light. For example, a black paper tape or a cut black thick rubber tube can be placed on the wall of the glass measuring instrument at a position not more than 1mm below the positioning liquid level of the glass measuring instrument. When the scale line of the measuring instrument is a bad line, the line of sight should be at the position where the front and rear parts of the scale line edge overlap! , which can avoid parallax; when the scale line of the measuring instrument is not a ring line, a black light-shielding tape can be used to line the back of the measuring instrument to make the scale line clear, and the parallax at this time can be ignored. However, it should be noted that the eye and the upper edge of the scale line should be in the same horizontal plane for reading. 3
Metrological performance requirements
Flow rate of standard glass measuring vessels
JJG 202001
The outflow time of various standard glass measuring vessels should be strictly controlled as specified in Tables 4 and 5. Table 4 Outflow time and waiting time of first-class standard glass measuring vessel Outflow waiting time
Specification model
1B-15
RH-200
RB-250
RB-50)
RB-1000
FXR-1O
FXB-25
FXB-50
Hand-checked
Medium cup standard electric
Capacity/ml.
Inch/
Specification model
LB-20
DR-40
DB-50
DB-100
LB- 200
LB-250
LB-500
TB - 1000
TIXB-1
DXB - 2
DXB - 3
DXB- 10
TIXR-15
I1XB- 20
DXB-25
DXB-S0
DXB-100
Capacity/mL
Down-calibration
A wrinkled tube
For A-level inspection
By hand inspection
Grading single mark line suction
Time/s
Time/5
Capacity/mL
JIG 20-—2001
Outflow time and waiting time of second-class standard glasswareFlow time/s
Standard volume/ml
0.5 +2+2.5
2+8+10
2.5 + 10 + 12.5
5 + 20 + 25
10+40+50
25 + 100 ± 125
Time!
The outflow time of standard glassware with special capacity can be determined by referring to the outflow time of standard glassware with similar capacity in Table 4 and Table 5.5.1.2.
5.2 Allowable error of standard glass measuring instruments
5.2.1 The nominal capacity tolerance of a standard glass measuring instrument shall be 1/3 to 1/5 of the capacity tolerance of the glass measuring instrument being tested: the capacity tolerance ranges of various types of standard glass measuring instruments are shown in Tables 6 and 7. 5.2.2 The capacity tolerance of the upper tolerance line of a standard glass measuring instrument shall not exceed the tolerance limit of the measuring instrument being tested. 5
Specification model
RR-5
RR-5
RR- 10
RB- 50
Nominal capacity
JJG20-—2001
First-class standard glass container capacity tolerance table
Allowable error
Specification model
RB - 100
RB-100
RB-100
RB~ 100
RB-100
RB-100
RH- 200
RR-200
Nominal capacity
RB- 200
RR-200
HB-250
HB- 250
RB-250
RB-250
RB-250
RB-250
RB-500
RR-500
RB -500
RB-500
RB-500
RB-1000
RB-1000
RB-- 1000
RB-1000
RR- 2000 | | tt | RR-2500 ||tt | 10
B - 50
DB - 60
DB - 80
DR - 100
Nominal capacity
.5.000m
JJG 20—2001
Table 6 (continued)
Allowable error
（±）
：250
Specification model
IB -- 10
LB- 25
LB- 50
LB-100
LB-200
LB- s00
- 1000
LB+ 2000
FXB-10
FXB- 12.5
FXH - 25
FXB-50
DXB - 2
DXB - 3
DXB 10
DXB - 15
DXB- 20
IXB-25
DXB-50
T>XB-100
Nominal wear
Allowable error
.0.050
Inch/
Specification model
LB- 20
DR- 40
DB - 50
DB-100||tt ||LB - 200
LB-250
LB-500
TB - 1000
TIXB-1
DXB - 2
DXB - 3
DXB- 10
TIXR-15
I1XB- 20
DXB-25
DXB-S0
DXB-100
Capacity/mL
lower calibration
A wrinkled tube
About A-level inspection
Inspect by hand
Grading single-line suction
Time/s
Time/5||tt| |Capacity/mL
JIG 20-—2001
Outflow time and waiting time of second-class standard glassware
Time/s
Standard capacity/ml| |tt||0.5 +2+2.5
2+8+10
2.5 + 10 + 12.5
5 + 20 + 25
10+40+50
25 + 100 ± 125
time!
For the outflow time of standard glass vessels with special capacity, refer to Table 4. 5.1.2
5.2 Allowable error of standard glass measuring instruments
5.2.1 Standard glass measuring instruments The nominal capacity tolerance of the glass measuring instrument should be 1/3 to 1/5 of the capacity tolerance of the glass measuring instrument being tested. The capacity tolerance range of each type of standard glass measuring instrument is shown in Table 6 and Table 7. 5.2.2 Standard glass The capacity tolerance of the upper tolerance line of the measuring instrument shall not exceed the tolerance limit of the measuring instrument being tested. 5
Specification model
RR-5
RR-5
RR- 10
RB- 50
Nominal capacity|| tt||JJG20-—2001
Capacity tolerance table of first-class standard glass devices
Allowable error
Specification model
RB - 100
RB-100
RB-100
RB~ 100
RB-100
RB-100
RH- 200
RR- 200
Nominal capacity
RB- 200
RR-200
RB-250
HB-250
HB- 250
RB-250
RB-250| |tt||RB-250
RB-250
RB- 500
RR-500
RB-500
RB-500||tt ||RB-500
RB-1000
RB-1000
RB-- 1000
RB-1000
RR- 2000
RR-2000
RB-2000
RB-2000
RB-2000
RB-2000
Allow error|| tt||Specification model
RB2500
RB-2500
RB-2500
RR-2500
RB-5000
RB- 5000
RB- 5000
RB-5000
RB- 10000
RB - 10000
RB - 10000
RB--10000
DB- 10
B - 50
DB - 60
DB - 80
DR - 100
Nominal capacity
.5.000m| |tt||JJG 20—2001
Table 6 (continued)
Allowable error
（±）
：250
Specification model||tt ||IB -- 10
LB- 25
LB- 50
LB-100
LB-200
LB- s00||tt| |- 1000
LB+ 2000
FXB-10
FXB- 12.5
FXH - 25
FXB-50
DXB - 2
DXB - 3
DXB 10
DXB - 15|| tt||DXB- 20
IXB-25
DXB-50
T>XB-100
Nominal wear
Allowable error|| tt||.0.050
Inch/
Specification model
LB- 20
DR- 40
DB - 50
DB-100||tt ||LB - 200
LB-250
LB-500
TB - 1000
TIXB-1
DXB - 2
DXB - 3
DXB- 10
TIXR-15
I1XB- 20
DXB-25
DXB-S0
DXB-100
Capacity/mL
lower calibration
A wrinkled tube
About A-level inspection
Inspect by hand
Grading single-line suction
Time/s
Time/5||tt| |Capacity/mL
JIG 20-—2001
Outflow time and waiting time of second-class standard glassware
Time/s
Standard capacity/ml| |tt||0.5 +2+2.5
2+8+10
2.5 + 10 + 12.5
5 + 20 + 25
10+40+50
25 + 100 ± 125
time!
For the outflow time of standard glass vessels with special capacity, refer to Table 4. 5.1.2
5.2 Allowable error of standard glass measuring instruments
5.2.1 Standard glass measuring instruments The nominal capacity tolerance of the glass measuring instrument should be 1/3 to 1/5 of the capacity tolerance of the glass measuring instrument being tested. The capacity tolerance range of each type of standard glass measuring instrument is shown in Table 6 and Table 7. 5.2.2 Standard glass The capacity tolerance of the upper tolerance line of the measuring instrument shall not exceed the tolerance limit of the measuring instrument being tested. 5
Specification model
RR-5
RR-5
RR- 10
RB- 50
Nominal capacity|| tt||JJG20-—2001
Capacity tolerance table of first-class standard glass devices
Allowable error
Specification model
RB - 100
RB-100
RB-100
RB~ 100
RB-100
RB-100
RH- 200
RR- 200
Nominal capacity
RB- 200
RR-200
RB-250
HB-250
HB- 250
RB-250
RB-250| |tt||RB-250
RB-250
RB- 500
RR-500
RB-500
RB-500||tt ||RB-500
RB-1000
RB-1000
RB-- 1000
RB-1000
RR- 2000
RR-2000
RB-2000
RB-2000
RB-2000
RB-2000
Allow error|| tt||Specification model
RB2500
RB-2500
RB-2500
RR-2500
RB-5000
RB- 5000
RB- 5000
RB-5000
RB- 10000
RB - 10000
RB - 10000
RB--10000
DB- 10
B - 50
DB - 60
DB - 80
DR - 100
Nominal capacity
.5.000m| |tt||JJG 20—2001
Table 6 (continued)
Allowable error
（±）
：250
Specification model||tt ||IB -- 10
LB- 25
LB- 50
LB-100
LB-200
LB- s00||tt| |- 1000
LB+ 2000
FXB-10
FXB- 12.5
FXH - 25
FXB-50
DXB - 2
DXB - 3
DXB 10
DXB - 15|| tt||DXB- 20
IXB-25
DXB-50
T>XB-100
Nominal wear
Allowable error|| tt||.0.0502 The capacity tolerance of the upper tolerance line of the standard glass measuring instrument shall not exceed the tolerance limit of the measured instrument. 5
Specification model
RR-5
RR-5
RR- 10
RB- 50
Nominal capacity
JJG20-—2001
Capacity tolerance table of first-class standard glass measuring instruments
Allowable error
Specification model
RB - 100
RB-100
RB-100
RB-100
RH- 200
RR-200
Nominal capacity
RB- 200
RR-200
HB-250
HB- 250
RB-250
RB-250
RB-250
RB-250
RB-500
RR-500
RB -500
RB-500
RB-500
RB-1000
RB-1000
RB-- 1000
RB-1000
RR- 2000 | | tt | RR-2500 ||tt | 10
B - 50
DB - 60
DB - 80
DR - 100
Nominal capacity
.5.000m
JJG 20—2001
Table 6 (continued)
Allowable error
（±）
：250
Specification model
IB -- 10
LB- 25
LB- 50
LB-100
LB-200
LB- s00
- 1000
LB+ 2000
FXB-10
FXB- 12.5
FXH - 25
FXB-50
DXB - 2
DXB - 3
DXB 10
DXB - 15
DXB- 20
IXB-25
DXB-50
T>XB-100
Nominal wear
Allowable error
.0.0502 The capacity tolerance of the upper tolerance line of the standard glass measuring instrument shall not exceed the tolerance limit of the measured instrument. 5
Specification model
RR-5
RR-5
RR- 10
RB- 50
Nominal capacity
JJG20-—2001
Capacity tolerance table of first-class standard glass measuring instruments
Allowable error
Specification model
RB - 100
RB-100
RB-100
RB-100
RH- 200
RR-200
Nominal capacity
RB- 200
RR-200
HB-250
HB- 250
RB-250
RB-250
RB-250
RB-250
RB-500
RR-500
RB -500
RB-500
RB-500
RB-1000
RB-1000
RB-- 1000
RB-1000
RR- 2000 | | tt | RR-2500 ||tt | 10
B - 50
DB - 60
DB - 80
DR - 100
Nominal capacity
.5.000m
JJG 20—2001
Table 6 (continued)
Allowable error
（±）
：250
Specification model
IB -- 10
LB- 25
LB- 50
LB-100
LB-200
LB- s00
- 1000
LB+ 2000
FXB-10
FXB- 12.5
FXH - 25
FXB-50
DXB - 2
DXB - 3
DXB 10
DXB - 15
DXB- 20
IXB-25
DXB-50
T>XB-100
Nominal wear
Allowable error
.0.050
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