Some standard content:
National Metrology Verification Regulation of the People's Republic of China JJG196—2006
Common Glass Measuring Instruments
Working Glass Container
Promulgated on 2006-12-08
Implementation on 2007-06-08
Promulgated by the General Administration of Quality Supervision, Inspection and Quarantine JJG196-2006
Verification Regulation of
Working Glass Container
JJG196—2006
Replaces JJG196—1990
This regulation was approved by the General Administration of Quality Supervision, Inspection and Quarantine on December 8, 2006, and came into effect on June 8, 2007.
Department of cooperation with foreign national classes
Responsible unit: National Technical Committee on Flow and Capacity Measurement Drafting unit: Henan Institute of Metrology Shanghai Institute of Metrology and Testing Technology
Beijing Institute of Metrology and Testing Science
Participating unit: China Institute of Metrology Puyang Longxing Petroleum Instrument Factory
This regulation is entrusted to the National Technical Committee on Flow and Capacity Measurement to be responsible for the interpretation of this regulation Main drafters:
Du Shuli
Zhang Zhiqing
Xie Junyan
Ma Xiaoyong
Participating drafters:
Wang Qingbin
JJG196—2006
Treasure Instrument Measurement Hall
(Henan Institute of Metrology)
(Henan Institute of Metrology)
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(Shanghai Institute of Metrology and Testing Technology) (Beijing Institute of Metrology and Testing Science) country
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(China Institute of Metrology)
(Shanghai Institute of Metrology and Testing Technology) (Puyang Longxing Petroleum Instrument Factory)
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2 References·
3 Terms and measurement units.
4 Overview
JJG196—2006
4.1 Classification, type, accuracy grade and nominal capacity of glass measuring instruments4.2 Structure of glass measuring instruments
5 General technical requirements
5.1 Material
5.2 Appearance
5.3 Structure
5.4 Tightness·
6 Metrological performance requirements
6.1 Outflow time and waiting time·
6.2 Capacity tolerance
7 Control of measuring instruments
7.1 Verification conditions...
7.2 Verification items·
7.3 Verification methods·
7.4 Handling of verification results…….
7.5 Verification cycle.
Appendix A Operation steps for verification of capacity of commonly used glass measuring instrumentsAppendix B Table of K(t) values of commonly used glass measuring instrumentsAppendix C Verification records of commonly used glass measuring instruments
Appendix D Format of inner pages of verification certificate
Appendix E Format of inner pages of verification result notification
(5)
1 Scope
JJG196—2006
Verification procedure for commonly used glass measuring instruments
This procedure applies to the initial verification, subsequent verification and in-use inspection of commonly used glass measuring instruments (hereinafter collectively referred to as glass measuring instruments) such as burettes, graduated pipettes, single-marked pipettes, single-marked volumetric flasks, measuring cylinders and measuring cups that are newly manufactured and in use.
2 References
JJG20-2001 Standard glass measuring instrument
GB/T15726—1995 Test method for internal stress of glass instrument GB6682—1992 Specification and test method for water in analytical laboratories When using this procedure, attention should be paid to the use of the current valid versions of the above references. 3 Terms and measurement units
3.1 Outlow graduated pipette For graduated pipettes, when the liquid naturally flows to the liquid outlet and stops flowing, the residual liquid should be retained at the mouth end. 3.2 Blowing graduated pipette For graduated pipettes, when the liquid naturally flows to the liquid outlet and stops flowing, the liquid remaining at the liquid outlet line should be discharged. 3.3 Burette with stopcock Burette with a straight piston to connect the measuring tube and the liquid outlet. 3.4 Burette without stopcock: a burette that uses a rubber hose with a glass ball in the inner hole to connect the measuring tube and the liquid outlet. 3.5 Automatic burette with three-way stopcocks: a burette that uses a three-way piston to connect the measuring tube and the liquid outlet and has an automatic positioning device. 3.6 Automatic burette with side stopcock: a burette with a straight piston on the side and an automatic zeroing device. 3.7 Automatic burette with side three-way stopcocks: a burette with a three-way piston on the side and an automatic zeroing device. 3.8 Burette with seat: a burette with an auxiliary injection tube and supported by a base. 3.9 Burette with holder: a burette with an auxiliary injection tube and mounted on a bracket. 3.10 Residual liquid
JJG196--2006
For pipettes, when the liquid naturally flows to the end of the liquid outlet and stops flowing, the residual liquid in the liquid outlet. 3.11 Capacity unit capacityunit
The capacity unit of glass measuring instruments is cubic centimeters (cm3) or milliliters (mL). Milliliters (mL) are the special names for cubic centimeters (cm2). wwW.bzxz.Net
4 Overview
4.1 Classification, type, accuracy level and nominal capacity of glass measuring instruments Commonly used glass measuring instruments include burettes, graduated pipettes, single-line pipettes, single-line volumetric flasks, measuring cylinders and measuring cups. Glass measuring instruments are divided into two types according to their types: measuring type and measuring type. Glass measuring instruments are divided into Class A and Class B according to their accuracy, among which measuring cylinders and measuring cups are not classified. The classification, type, accuracy level and nominal capacity of glass measuring instruments are shown in Table 1. Table 1 Classification, type, accuracy grade and nominal capacity of glass measuring instruments Classification of glass measuring instruments
No stopper, with stopper, three-way piston,
Burette
Graduated pipette
Automatic zeroing burette
Stand-type burette
Clip-type burette
Flow-out type
Blow-out type
Single-marked pipette
Single-marked volumetric flask | |tt||Without stopper
Structure of glass measuring vessel
For the structure of glass measuring vessel, please refer to Figures 1 to 12. 2
Accuracy level
Nominal capacity/mL
5,10,25,50,100
1,2,5，10
1,2,5,10,25,50
0.1,0.2,0.25,0.5,1, 2, 5, 10 | | tt | |tt||500，1000,2000
5,10,20,50,100,250,500,
1000, 2000
Figure 1 Burette with stopper
1-Volume tube: 2-Liquid flow port;
3-Through piston
Figure 4 Graduated pipette
1-Volume tube: 2-Liquid flow port
JJG196-2006
Figure 2 Burette without stopper
1-Volume tube: 2-Liquid flow port:
3-Rubber hose: 4-Glass ball
Figure 5 Single-line pipette
1-Liquid flow tube ：2—liquid flow port
Figure 3 Three-way piston automatic
zero-setting burette
1—volume tube: 2—liquid flow port:
3—three-way piston; 4—zero-setting device
Figure 6 Single-line volumetric flask
1—bottle body: 2—neck bottleneck:
3—bottle stopper
Figure 7 Volumetric flask
1—dividing table: 2—liquid pouring nozzle:
3—stopper
Figure 10 Side three-way piston
automatic zero-setting burette Fixed pipe
1-measuring pipe; 2-water return pipe;
3-three-way piston; 4-flow storage bottle;
5-fixed zero position device
JJG196-2006
Figure 8 Measuring cup
1-dividing table: 2-liquid pouring nozzle
Figure 11 pedestal burette
1-measuring pipe: 2-liquid injection pipe:
3-water inlet piston 4-water outlet piston;
5-base
Figure 9-side piston automatic
Zero-setting burette
1-volume tube: 2-water inlet pipe;
3-piston: 4-liquid storage bottle;
5-zero-setting device
Figure 12 Clip-on burette
1-volume tube: 2-liquid injection pipette:
3-water inlet piston: 4-water outlet piston
5General technical requirements
5.1Material
JJG1962006
5.1.1Glass measuring instruments are usually made of soda-lime glass or borosilicate glass. 5.1.2Burettes, graduated pipettes and measuring cylinders are allowed to be made of two-color glass tubes with blue lines and milky white backing. 5.1.3Glass measuring instruments must be well annealed, and their internal stress must not exceed the requirements of Table 2. Table 2 Internal stress
Measuring instruments (except burettes)
Burettes, piston cores and measuring bottles, plugs and covers of measuring cylinders 5.2 Appearance
Residual internal stress
Optical path difference per unit thickness ≤100nm/cm
Optical path difference per unit thickness ≤120nm/cm
5.2.1 Glass measuring instruments are not allowed to have defects that affect the measurement readings and the strength of use. The specific requirements shall comply with the current national standards.
Division lines and numerical values shall be clear, complete and durable. The specific requirements shall comply with the current national standards. 5.2.2
5.2.3 The width and graduation value of the graduation line are shown in Tables 3 to 8. 5.2.4 Glass measuring vessels should have the following markings (see Figure 13): Manufacturer name or trademark
In or Ex+30s
5.2.4.1 Manufacturer name or trademark;
5.2.4.2 Standard temperature (20℃);
Figure 13 Marking arrangement diagram
5.2.4.3 Type marking: "In" for measuring-in type, "Ex" for measuring-out type, "Blow" or "Bl" for blowing-out type owout\
5.2.4.4 Waiting time: +××s;
JJG196—2006
5.2.4.5 Nominal total capacity and unit: xxmL;5.2.4.6 Accuracy grade: A or B. Glass measuring vessels with accuracy grade but not marked shall be treated as Class B.5.2.4.7 Glass measuring vessels made of borosilicate glass shall be marked with "B";5.2.4.8 Non-standard ports and plugs, piston cores and jackets must use the same matching number. Flow of unstoppered burettes The mouth and the lower part of the tube should also be marked with the same number
5.3 Structure
5.3.1 The mouth of the glass measuring vessel should be perpendicular to the axis of the glass measuring vessel, and the edge of the mouth should be flat and smooth, without rough spots and unmelted gaps.
5.3.2 The liquid outlet of the burette and pipette should gradually narrow toward the tube mouth. The liquid outlet must be ground and chamfered or melted. The mouth should not narrow suddenly and the inner hole should not be skewed. 5.3.3 The pouring nozzle of the measuring cylinder and measuring cup should be able to pour out the liquid in the measuring cylinder and measuring cup in a thin stream without overflowing. When the graduation surface is aligned with the When observing, the position of the pouring spout: the spout of the measuring cylinder is on the left: the measuring cup below 250mL (including 250mL) is on the right: the measuring cup above 500mL is on the left, 5.3.4 When the measuring cup, measuring cylinder and measuring bottle are placed on the platform, they should not be shaken. When the empty measuring cup, empty measuring cylinder (without stopper) and the empty measuring bottle (without stopper) larger than 25mL (including 25mL) are placed on an inclined plane at an angle of 15° to the horizontal plane, they should not fall; when the empty measuring bottle (without stopper) smaller than 25mL is placed on an inclined plane at an angle of 10° to the horizontal plane, it should not fall. . 5.4 Tightness
5.4.1 Tightness requirements for the glass piston of the burette: When water is filled to the highest mark, the piston stays in the closed state for 20 minutes, and the leakage should not be greater than the minimum graduation value. 5.4.2 Tightness requirements for the plastic piston of the burette: When water is filled to the highest mark, the piston stays in the closed state for 50 minutes, and the leakage should not be greater than the minimum graduation value. 5.4.3 Tightness requirements between the mouth and stopper of the stoppered measuring cylinder and measuring bottle: When water is filled to the highest mark, the stopper is tightly closed and turned upside down 10 times. Each time When inverted, it should stay in the inverted state for at least 10 seconds, and no water should seep out. 6 Metering performance requirements
Outflow time and waiting time
The outflow time and waiting time of the burette, graduated pipette and single-marked pipette are shown in Tables 3 to 5. Table 3 List of metrological requirements for burettes
Nominal capacity/mL
Graduation value/mL
Capacity tolerance
Outflow time
Waiting time/s
Graduation line width/mm
35~-70
70-100
60~100
Nominal capacity/mL
Capacity tolerance
Outflow time
Division line width/mm
Nominal capacity
Division value
JJG196-—2006
List of measurement requirements for single-marked pipettes
20--30
Measuring requirements for graduated pipettes
Outflow type
Outflow type
N stind
6.2 Capacity filling tolerance
25--35
Table?
Sea time/s
Blow-out type
METROL
15--25
Grade width
Class A:
Class B:
At the standard temperature of 20℃, the nominal capacity and zero to any quantity of the burette and graduated pipette, as well as the maximum error between any two calibration points, shall comply with the provisions of Table 3 and Table 5. The nominal capacity tolerance of single-marked pipettes and measuring bottles shall comply with the provisions of Table 4 and Table 6. The nominal capacity and capacity tolerance of any quantity of measuring cylinders and measuring cups shall comply with the provisions of Table 7 and Table 8.
JJG1962006
080k
0°9k
0'sk
010k
S0'0干
0r0于
010年
0100k1.1 Glass measuring instruments are usually made of soda-lime glass or borosilicate glass. 5.1.2 Burettes, graduated pipettes and measuring cylinders are allowed to be made of two-color glass tubes with blue lines and milky white backing. 5.1.3 Glass measuring instruments must be well annealed, and their internal stress must not exceed the requirements of Table 2. Table 2 Internal stress
Measuring instruments (except burettes)
Burettes, piston cores and measuring bottles, plugs and covers of measuring cylinders 5.2 Appearance
Residual internal stress
Optical path difference per unit thickness ≤100nm/cm
Optical path difference per unit thickness ≤120nm/cm
5.2.1 Glass measuring instruments are not allowed to have defects that affect the measurement reading and the strength of use. The specific requirements shall comply with the current national standards.
Graduation lines and numerical values of the amount shall be clear, complete and durable. The specific requirements shall comply with the current national standards. 5.2.2
5.2.3 The width and graduation value of the graduation line are shown in Tables 3 to 8. 5.2.4 Glass measuring vessels should have the following markings (see Figure 13): Manufacturer name or trademark
In or Ex+30s
5.2.4.1 Manufacturer name or trademark;
5.2.4.2 Standard temperature (20℃);
Figure 13 Marking arrangement diagram
5.2.4.3 Type marking: "In" for measuring-in type, "Ex" for measuring-out type, "Blow" or "Bl" for blowing-out type owout\
5.2.4.4 Waiting time: +××s;
JJG196—2006
5.2.4.5 Nominal total capacity and unit: xxmL;5.2.4.6 Accuracy grade: A or B. Glass measuring vessels with accuracy grade but not marked shall be treated as Class B.5.2.4.7 Glass measuring vessels made of borosilicate glass shall be marked with "B";5.2.4.8 Non-standard ports and plugs, piston cores and jackets must use the same matching number. Flow of unstoppered burettes The mouth and the lower part of the tube should also be marked with the same number
5.3 Structure
5.3.1 The mouth of the glass measuring vessel should be perpendicular to the axis of the glass measuring vessel, and the edge of the mouth should be flat and smooth, without rough spots and unmelted gaps.
5.3.2 The liquid outlet of the burette and pipette should gradually narrow toward the tube mouth. The liquid outlet must be ground and chamfered or melted. The mouth should not narrow suddenly and the inner hole should not be skewed. 5.3.3 The pouring nozzle of the measuring cylinder and measuring cup should be able to pour out the liquid in the measuring cylinder and measuring cup in a thin stream without overflowing. When the graduation surface is aligned with the When observing, the position of the pouring spout: the spout of the measuring cylinder is on the left: the measuring cup below 250mL (including 250mL) is on the right: the measuring cup above 500mL is on the left, 5.3.4 When the measuring cup, measuring cylinder and measuring bottle are placed on the platform, they should not be shaken. When the empty measuring cup, empty measuring cylinder (without stopper) and the empty measuring bottle (without stopper) larger than 25mL (including 25mL) are placed on an inclined plane at an angle of 15° to the horizontal plane, they should not fall; when the empty measuring bottle (without stopper) smaller than 25mL is placed on an inclined plane at an angle of 10° to the horizontal plane, it should not fall. . 5.4 Tightness
5.4.1 Tightness requirements for the glass piston of the burette: When water is filled to the highest mark, the piston stays in the closed state for 20 minutes, and the leakage should not be greater than the minimum graduation value. 5.4.2 Tightness requirements for the plastic piston of the burette: When water is filled to the highest mark, the piston stays in the closed state for 50 minutes, and the leakage should not be greater than the minimum graduation value. 5.4.3 Tightness requirements between the mouth and stopper of the stoppered measuring cylinder and measuring bottle: When water is filled to the highest mark, the stopper is tightly closed and turned upside down 10 times. Each time When inverted, it should stay in the inverted state for at least 10 seconds, and no water should seep out. 6 Metering performance requirements
Outflow time and waiting time
The outflow time and waiting time of the burette, graduated pipette and single-marked pipette are shown in Tables 3 to 5. Table 3 List of metrological requirements for burettes
Nominal capacity/mL
Graduation value/mL
Capacity tolerance
Outflow time
Waiting time/s
Graduation line width/mm
35~-70
70-100
60~100
Nominal capacity/mL
Capacity tolerance
Outflow time
Division line width/mm
Nominal capacity
Division value
JJG196-—2006
List of measurement requirements for single-marked pipettes
20--30
Measuring requirements for graduated pipettes
Outflow type
Outflow type
N stind
6.2 Capacity filling tolerance
25--35
Table?
Sea time/s
Blow-out type
METROL
15--25
Grade width
Class A:
Class B:
At the standard temperature of 20℃, the nominal capacity and zero to any quantity of the burette and graduated pipette, as well as the maximum error between any two calibration points, shall comply with the provisions of Table 3 and Table 5. The nominal capacity tolerance of single-marked pipettes and measuring bottles shall comply with the provisions of Table 4 and Table 6. The nominal capacity and capacity tolerance of any quantity of measuring cylinders and measuring cups shall comply with the provisions of Table 7 and Table 8.
JJG1962006
080k
0°9k
0'sk
010k
S0'0干
0r0于
010年
0100k1.1 Glass measuring instruments are usually made of soda-lime glass or borosilicate glass. 5.1.2 Burettes, graduated pipettes and measuring cylinders are allowed to be made of two-color glass tubes with blue lines and milky white backing. 5.1.3 Glass measuring instruments must be well annealed, and their internal stress must not exceed the requirements of Table 2. Table 2 Internal stress
Measuring instruments (except burettes)
Burettes, piston cores and measuring bottles, plugs and covers of measuring cylinders 5.2 Appearance
Residual internal stress
Optical path difference per unit thickness ≤100nm/cm
Optical path difference per unit thickness ≤120nm/cm
5.2.1 Glass measuring instruments are not allowed to have defects that affect the measurement reading and the strength of use. The specific requirements shall comply with the current national standards.
Graduation lines and numerical values of the amount shall be clear, complete and durable. The specific requirements shall comply with the current national standards. 5.2.2
5.2.3 The width and graduation value of the graduation line are shown in Tables 3 to 8. 5.2.4 Glass measuring vessels should have the following markings (see Figure 13): Manufacturer name or trademark
In or Ex+30s
5.2.4.1 Manufacturer name or trademark;
5.2.4.2 Standard temperature (20℃);
Figure 13 Marking arrangement diagram
5.2.4.3 Type marking: "In" for measuring-in type, "Ex" for measuring-out type, "Blow" or "Bl" for blowing-out type owout\
5.2.4.4 Waiting time: +××s;
JJG196—2006
5.2.4.5 Nominal total capacity and unit: xxmL;5.2.4.6 Accuracy grade: A or B. Glass measuring vessels with accuracy grade but not marked shall be treated as Class B.5.2.4.7 Glass measuring vessels made of borosilicate glass shall be marked with "B";5.2.4.8 Non-standard ports and plugs, piston cores and jackets must use the same matching number. Flow of unstoppered burettes The mouth and the lower part of the tube should also be marked with the same number
5.3 Structure
5.3.1 The mouth of the glass measuring vessel should be perpendicular to the axis of the glass measuring vessel, and the edge of the mouth should be flat and smooth, without rough spots and unmelted gaps.
5.3.2 The liquid outlet of the burette and pipette should gradually narrow toward the tube mouth. The liquid outlet must be ground and chamfered or melted. The mouth should not narrow suddenly and the inner hole should not be skewed. 5.3.3 The pouring nozzle of the measuring cylinder and measuring cup should be able to pour out the liquid in the measuring cylinder and measuring cup in a thin stream without overflowing. When the graduation surface is aligned with the When observing, the position of the pouring spout: the spout of the measuring cylinder is on the left: the measuring cup below 250mL (including 250mL) is on the right: the measuring cup above 500mL is on the left, 5.3.4 When the measuring cup, measuring cylinder and measuring bottle are placed on the platform, they should not be shaken. When the empty measuring cup, empty measuring cylinder (without stopper) and the empty measuring bottle (without stopper) larger than 25mL (including 25mL) are placed on an inclined plane at an angle of 15° to the horizontal plane, they should not fall; when the empty measuring bottle (without stopper) smaller than 25mL is placed on an inclined plane at an angle of 10° to the horizontal plane, it should not fall. . 5.4 Tightness
5.4.1 Tightness requirements for the glass piston of the burette: When water is filled to the highest mark, the piston stays in the closed state for 20 minutes, and the leakage should not be greater than the minimum graduation value. 5.4.2 Tightness requirements for the plastic piston of the burette: When water is filled to the highest mark, the piston stays in the closed state for 50 minutes, and the leakage should not be greater than the minimum graduation value. 5.4.3 Tightness requirements between the mouth and stopper of the stoppered measuring cylinder and measuring bottle: When water is filled to the highest mark, the stopper is tightly closed and turned upside down 10 times. Each time When inverted, it should stay in the inverted state for at least 10 seconds, and no water should seep out. 6 Metering performance requirements
Outflow time and waiting time
The outflow time and waiting time of the burette, graduated pipette and single-marked pipette are shown in Tables 3 to 5. Table 3 List of metrological requirements for burettes
Nominal capacity/mL
Graduation value/mL
Capacity tolerance
Outflow time
Waiting time/s
Graduation line width/mm
35~-70
70-100
60~100
Nominal capacity/mL
Capacity tolerance
Outflow time
Division line width/mm
Nominal capacity
Division value
JJG196-—2006
List of measurement requirements for single-marked pipettes
20--30
Measuring requirements for graduated pipettes
Outflow type
Outflow type
N stind
6.2 Capacity filling tolerance
25--35
Table?
Sea time/s
Blow-out type
METROL
15--25
Grade width
Class A:
Class B:
At the standard temperature of 20℃, the nominal capacity and zero to any quantity of the burette and graduated pipette, as well as the maximum error between any two calibration points, shall comply with the provisions of Table 3 and Table 5. The nominal capacity tolerance of single-marked pipettes and measuring bottles shall comply with the provisions of Table 4 and Table 6. The nominal capacity and capacity tolerance of any quantity of measuring cylinders and measuring cups shall comply with the provisions of Table 7 and Table 8.
JJG1962006
080k
0°9k
0'sk
010k
S0'0干
0r0于
010年
0100k2. The tightness requirement of the plastic piston of the burette: When water is filled to the highest mark, the piston stays in the closed state for 50 minutes, and the leakage should not be greater than the minimum graduation value. 5.4.3. The tightness requirement between the mouth and the stopper of the stoppered measuring cylinder and measuring bottle: When water is filled to the highest mark, the stopper is tightly closed and inverted 10 times. Each time it is inverted, it should stay in the inverted state for at least 10 seconds, and no water should leak out. 6 Metrological performance requirements
Outflow time and waiting time
For the outflow time and waiting time of burettes, graduated pipettes and single-marked pipettes, please refer to Tables 3 to 5. Table 3 Summary of metrological requirements for burettes
Nominal capacity/mL
Graduation value/mL
Capacity tolerance
Outflow time
Waiting time/s
Graduation line width/mm
35~-70
70-100
60~100
Nominal capacity/mL
Capacity tolerance
Outflow time
Graduation line width/mm
Nominal capacity
Graduation value
JJG196 -—2006
List of metrological requirements for single-marked pipettes
20--30
Metering requirements for graduated pipettes
Outflow type
Blow-out type
Nstind
6.2 Capacity filling tolerance
25--35
List?
Sea time/s
Blow-out type
METROL
15--25
Division line width
Grade A:
Grade B:
At the standard temperature of 20℃, the nominal capacity and the maximum error from zero to any component of the burette and graduated pipette, as well as the maximum error between any two calibration points, shall comply with the requirements of Table 3 and Table 5. The nominal capacity tolerance of single-line pipettes and measuring bottles shall comply with the provisions of Table 4 and Table 6. The nominal capacity and capacity tolerance of any portion of measuring cylinders and measuring cups shall comply with the provisions of Table 7 and Table 8.
JJG1962006
080k
0°9k
0'sk
010k
S0'0干
0r0于
010年
0100k2. The tightness requirement of the plastic piston of the burette: When water is filled to the highest mark, the piston stays in the closed state for 50 minutes, and the leakage should not be greater than the minimum graduation value. 5.4.3. The tightness requirement between the mouth and the stopper of the stoppered measuring cylinder and measuring bottle: When water is filled to the highest mark, the stopper is tightly closed and inverted 10 times. Each time it is inverted, it should stay in the inverted state for at least 10 seconds, and no water should leak out. 6 Metrological performance requirements
Outflow time and waiting time
For the outflow time and waiting time of burettes, graduated pipettes and single-marked pipettes, please refer to Tables 3 to 5. Table 3 Summary of metrological requirements for burettes
Nominal capacity/mL
Graduation value/mL
Capacity tolerance
Outflow time
Waiting time/s
Graduation line width/mm
35~-70
70-100
60~100
Nominal capacity/mL
Capacity tolerance
Outflow time
Graduation line width/mm
Nominal capacity
Graduation value
JJG196 -—2006
List of metrological requirements for single-marked pipettes
20--30
Metering requirements for graduated pipettes
Outflow type
Blow-out type
Nstind
6.2 Capacity filling tolerance
25--35
List?
Sea time/s
Blow-out type
METROL
15--25
Division line width
Grade A:
Grade B:
At the standard temperature of 20℃, the nominal capacity and the maximum error from zero to any component of the burette and graduated pipette, as well as the maximum error between any two calibration points, shall comply with the requirements of Table 3 and Table 5. The nominal capacity tolerance of single-line pipettes and measuring bottles shall comply with the provisions of Table 4 and Table 6. The nominal capacity and capacity tolerance of any portion of measuring cylinders and measuring cups shall comply with the provisions of Table 7 and Table 8.
JJG1962006
080k
0°9k
0'sk
010k
S0'0干
0r0于
010年
0100k
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