This standard is published for the first time. This standard specifies the conditions that a series of density meters should meet when used in the laboratory for routine measurement of liquid density. This standard is equivalent to ISO3507:1999 "Laboratory Glassware Density Meter" (English version). GB/T 21785-2008 Laboratory Glassware Density Meter GB/T21785-2008 Standard download decompression password: www.bzxz.net
This standard is published for the first time. This standard specifies the conditions that a series of density meters should meet when used in the laboratory for routine measurement of liquid density. This standard is equivalent to ISO3507:1999 "Laboratory Glassware Density Meter" (English version).
This standard is equivalent to ISO3507:1999 "Laboratory Glassware Density Meter" (English version).
Appendix A of this standard is an informative appendix.
This standard is proposed and managed by the National Technical Committee for Standardization of Hazardous Chemicals Management (SAC/TC251).
The drafting unit of this standard: Shenzhen Entry-Exit
Inspection and Quarantine Bureau of the People's Republic of China. Participating drafting units of this standard: Jiangsu Entry-Exit Inspection and Quarantine Bureau of the People's Republic of China, National Light Industry Glass Product Quality Supervision and Inspection Center. ||tt
||Main drafters of this standard: Wu Jingwu, Liu Xianjie, Yuan Chunmei, Li Bin, Liu Li, Xu Beibei, Yu Shuyuan, Li Ying, Wang Hongju, Chen Meirong, Wang Hongsong, Liu Junfeng.
This standard is published for the first time.
The clauses in the following documents become the clauses of this standard through reference in this standard. For all dated referenced documents, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, the parties to the agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For all undated referenced documents, the latest versions shall apply to this standard.
ISO383 Laboratory glassware - Interchangeable conical ground joints
ISO384:1978 Laboratory glassware - Principles of design and construction of volumetric glassware
ISO386 Laboratory glass tube liquid thermometers - Principles of design, construction and use
ISO719 Glass, resistance to hydrolysis of glass grains at 98°C - Test methods and classification
ISO3585-3.3 Borosilicate glass - Properties

ICS 130. 100
National Standard of the People's Republic of China
GB/T: 21785---2008/IS0 3507:1999 Laboratory glassware Pyknometers(ISO 3507:1999,IDT)
080925000416
Published on 2008-05~12
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Administration of Standardization of the People's Republic of China
2008-09-01Implementation on October 1, 2008
GB/T 21785--2008/1S0 3507:1999 This standard is equivalent to ISO3507:J.999 Laboratory Glass III Density Meter (English version). Appendix A of this standard is an informative appendix. This standard is proposed and managed by the National Technical Committee for the Administration of Hazardous Chemicals (SAC/TC251). The drafting unit of this standard: Shenzhen Entry-Exit Inspection and Quarantine Bureau of the People's Republic of China. The drafting units of this standard: Jiangsu Entry-Exit Inspection and Quarantine Bureau of the People's Republic of China, National Light Industry Glass Product Quality Supervision and Inspection Center. The main drafters of this standard: Wu Jingwu, Liu Xianjie, Shuai Chunmei, Li Bin, Liu Li, Xu Beijian, Yu Shuyuan, Li Ying, Wang Hongju, Chen Meirong, Wang Hongsong, Liu Junfeng.
This standard is published for the first time.
1 Scope
GS/T 21785-2008/IS0 3507:1999 Laboratory Glassware
Density Meter
This standard specifies the accessories that a series of density meters should be equipped with when used for routine measurement of bulk density in laboratory cases. Special density meters for special products or other density meters not used in general use are not included in this standard. The detailed information used to define these density meters should be included in the relevant international standards that specify or describe their use. Appendix A contains a set of devices suitable for adjusting the level of the liquid level in the neck of the Reischauer density meter. 2 Normative References
The provisions of the following documents become the provisions of this standard through the application of this standard. For the referenced documents with a date, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, parties to an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For undated references, the latest edition applies to this standard. ISO 383 Laboratory glassware III - Interchangeable square-ground glassware ISO 384:1978 Laboratory glassware - Principles of design and construction of volumetric glassware III ISO 386 Laboratory glass thermometers - Design, construction and use ISO 719 Resistance of glass crystals to hydrolysis at 98 °C - Test method and classification ISO 35853.3 Borosilicate glass - Properties 3 Calibration basis
3.1 Volume units
This standard uses milliliters (mL) as the equivalent of cubic meters (cm3). Note: The term milliliters (mL) is usually used as a special name for cubic meters (cm3). According to the resolution of the Second International Conference on Measurement, in general, when referring to the volume of instruments in international standards, the term milliliters is used, and the standard is also used in liters. 3.2 Reference temperature
If the effective volume is marked on the cumulative density meter, the calibration temperature for determining this effective volume should also be marked. Under normal circumstances, the standard reference temperature should be 20°C.
When the density meter is used in tropical areas and the ambient temperature is higher than 20°C, it is not desirable to use the standard reference temperature of 20°C in these areas. In this case, 27°C is recommended.
4 Types and size series
The following is a detailed description of the two tube-type density meters and the four bottle-type density meters, as listed in Figure 1 and the excerpts of Figures 1 to 6. Types I and 2 are tube-shaped and are suspended density meters. Types 3, 5 and 6 are bottle-shaped and are independent flat-bottomed density meters. Types 1, 3, 4 and 2 density meters (if covered) are used for volatile liquids. Type 5 density meters are used for highly viscous substances. The series sizes of various types of density meters are shown in Table 1. 1 Types and sizes of density meters
Lipkin
Sprengel
Gay-Lussar
5 10 25
Nominal volume/ml
25102550100
GB/T 21785--2008/IS0 3507: 1999
Reischauer
5 Volume of density meter
5.1 Effective volume
Hubbard
Insertion thermometer with ground joint
Mark 1 (continued)
10 25 50 100
10 25 50 100
Nominal volume/ml
Effective volume is the volume of water contained in the densitometer at base
degrees, in milliliters. At this temperature, the volume is specified as follows according to the type of densitometer:
Class 1: between the two scale lines!
-Class 2: from the end to the scale
3rd Class and Class 4: to degrees... Class 6: to recommended reference temperature 5.2 Nominal volume to bottle capillary line: top of capillary branch But it can also be the nominal volume, that is, the closest to the effective volume given in Table 1, the nominal volume accuracy of the density meter effective volume of the nominal volume, the density meter effective volume of the first class, the second class, the third class, the fourth class
Class 5
Class 6
7 Structure
7.1 Material
Commercial % confidence water
in)±5
Shre
Ga
Reischan
Hubbar
The effective volume of the ground-mouth thermometer
monitored by the value in Table 2 and Table 3 is not accurate
5mL;
The maximum value shown.
Exceed the following values
According to 1SO 719. The density meter shall be made of glass with a hydrolysis grade not less than HGB3 and a coefficient of thermal expansion not exceeding 3.3×10-5℃--1
Note: According to ISO 3585, the density meter material includes 3.3 borosilicate full wave expansion. The density meter should avoid visible defects as far as possible and appropriately avoid the influence of internal strain. The bottle or joint should be made of glass, and the glass and the glass used for the density meter with which it is matched should have similar thermal properties. 7.2 Maximum quality
The density meter quality should not exceed the maximum values ​​specified in Table 2, Table 3 and Table 4. 7.3 Dimensions
The density meter shall comply with the dimensional tolerance requirements specified in Table 2, Table 3 and Table 4. Other dimensions expressed as nominal values ​​without tolerances may be used as a guide for the manufacturer.
GB/ 21785--2008/IS0 3507: 19997.4.1 The six types of densitometers shall be as shown in Figures 1 to 6 and shall comply with the detailed requirements given in 7.4.2 to 7.4.8. The tapered portion of all densitometers shall be smoothly machined to avoid the formation of sharp side pockets and the generation of bubbles. 7.4.2 Type I densitometers shall have a round ball, as shown in Figure 1, which is gradually connected to the tube at both ends. As shown in Figure 1, the left arm of the densitometer shall be bent, with a height of (20 ± 2) r1m from its end to the bend, and an angle of 50° to 55°. The two ends of the densitometer shall be consistent with the axis of the tube, without shrinkage, and burned smoothly. 7.4.3 Type II densitometers shall have a cylindrical ball, with its two ends tapered, gradually connected to the adjacent alarm, and the two arms shall be bent at an angle of about 75° to the vertical. The U-shaped part of the densitometer shall be in the same plane as the densitometer. One arm should be conical and contracted, and the end of the arm should have a 0.5mm diameter hole, flat and at right angles to the axis of the tube, slightly inclined on the outside. The end of the other arm of the densitometer should be aligned with the axis of the tube, without contraction, and burned smooth.4 The second type of densitometer equipped with a side arm shall meet the following requirements: a) The two covers of the ground mouth part of the interface can be replaced, and the interface shall also meet the 5/9 size requirements of ISO383. b) The conical ground mouth part of the interface shall be formed by a small twist with a hole. This twist shall be flat and tapered, and the top of the mouth shall protrude from the ground mouth part.
c) The basket shall be able to be stably installed on the conical part and have sufficient size for cleaning the top of the mouth. 7.4.5 The third, fourth, fifth and sixth type densitometers shall be vertical when placed without shaking or rotating. When they are corked and placed 15" above the horizontal surface, they will not fall over when empty. 7.4.6 The main body of the 3rd, 4th and 6th class densitometers should be similar to the shapes in Figures 3, 4 and 6, with the distance from the plane of the maximum diameter to the bottom of the bottle being approximately 1/3 of the distance from the bottom of the neck of the densitometer to the bottom of the bottle. 7.4.7 The body of the 5th class densitometer should be as shown in Figure 5, with the upper end of the conical part having no sharp flanks and almost smoothly connected to the neck. The radius of curvature between the lower end and the bottom of the conical part should not exceed 5 μm. 7.4.8 The capillary branch of the 6th class densitometer should be smoothly connected to the densitometer body at approximately 90°. The upper part of the capillary branch should be parallel to the vertical axis of the densitometer body The outer diameter of the capillary branch is about 6 mm, and the outer diameter of the upper ground part is about 6 mm. 7.5 Neck
7.5.1 For density meters of types 3 and 5, the upper end of the neck of the bottle should be reshaped to ensure that there is no channel, which can cause liquid to accumulate between the bottle and the neck. The outer edge of the top of the neck should be slightly inclined. The neck should extend to the bottom of the bottle capsule. When the bottle is plugged, the edge of the bottle should not be lower than the lower end of the ground mouth. This is a tool manufacturing process, not a grinding process. "7.5.2 For density meters of type 4, the forehead part with the scale should be cylindrical, and the inner diameter should be consistent throughout the length of the scale. The inner diameter of the neck above this part should not shrink. The upper end of the neck ground part can be a reinforcing ring with a socket as shown in Figure 4, or it can be conical. In both cases the ground joints shall comply with ISO 383. The dimensions of the joints are given in Table 3. 7.5.3 For class 6 densitometers, the ground socket into which the thermometer is inserted shall comply with the 10/19 dimension of ISO 383. There shall be no channel between the ground joint and the assembled thermometer to prevent accumulation of liquid. The ground joints at the ends of capillary branches shall be a 7/16 taper in accordance with ISO 383 to allow capping of the branches. 7.6 Bottle stoppers and thermometers
7.6.1 Densitometer bottles shall be ground to fit the neck of the bottle and shall comply with the requirements of 7.6.2 to 7.6.6.
76.2 For class 3 densitometers, the insertion area shall be ground in parallel with the stopper when it is inserted, with the ground area of ​​the stopper extending above the neck of the bottle.
The top of the stopper shall be ground and polished at right angles to the axis and shall have a slight bevel. The top of the stopper shall be ground and polished at right angles to the axis and shall have a slight bevel. The edge contour of the hole from the top of the stopper to the bottom of the stopper shall be clear and shall not have any notches or recesses. 3
GB/T 21785—2008/IS0 3507:J999 The top of the stopper shall have two opposite beveled polished surfaces. These polished surfaces shall not infringe upon the mouth area of ​​the stopper. 7.6.3 For Class 4 densitometers, the stopper or cap shall be smooth to allow for good insertion or wearing on the neck of the bottle in accordance with the interchangeability requirements of 7.5.2.
7.6.4 For Class 5 densitometers, the capsule shall comply with the requirements of the third and fourth paragraphs of 7.6.2. The underside of the case shall be ground flat to the shape of a concave part of a sphere, the end edge shall be free of debris and cleanly formed. 7.6.5 For Class 6 densitometers and, where applicable, Class 2 densitometers, the cap of the branch pipe shall have a socket conforming to the 7/16 fitting size of ISO 383.
7.6.6 Class 6 densitometers shall be provided with an accompanying thermometer conforming to the requirements of ISO B86 and the ground area conforming to the 10/19 size requirements of ISO 383. The temperature measurement range shall be from 1eF°C to 35°C with a scale graduation of 0.2°C and a maximum permissible error of not more than 0.2°C. The temperature measuring liquid shall be mercury. The length of the thermometer shall be as specified in Table 4. When mercury thermometers are not permitted,
8 Graduation marks
8.1 General
Select a thermometer of at least equal accuracy. 8.1.1 The graduations shall be clear and permanent. 8.1.2 All graduations shall be level with the values ​​to which they refer. 8.1.3 The meniscus for adjusting and reading liquids shall be 8.2 Class 1 densitometers. 8.2.1 Each position of the graduation shall be 8 cm above the virtual division of the density meter. The dimensions of the first position are given in Table 2. 8.2.2 Length of scale lines 8.2.2.1 Long lines used to indicate each meter 8.2.2.2 Centre line between long lines 8.2.2.3 Between consecutive centre lines 8.2.2.4 When the densitometer is on the left, the numbers of the scale lines 8.2.3 shall be marked with the circumference of the scale in accordance with IEC 60448-384:1978, or with a 1/4 length gap. When the densitometer is vertical, the scale lines shall be at the same level. The gap shall be 1/8 of the length above the vertical line. The gap shall appear in the lower centre of the front of the two bars. The numerals shall be placed directly above the line to which they refer and slightly adjacent to the short line, as shown in Figure 1. 8.3 Class 2
densitometers shall have a single graduation line that completely encircles the instrument and has a nozzle on top. This graduation line shall be placed no more than 5 mm from the beginning of the bend in the tube and no more than 20 mm from the end of the tube opening. 8.4 Class 4
8.4.1 The densitometer collar shall have an annular mark not more than 0.3 mm wide and an additional graduation mark in millimeters 2 cm long on the neck of the densitometer. There shall be holes not more than 5 mm above and below the marking on the collar or at the beginning of the graduation mark on the front of the tube. 8.4.2 The length and sequence of the graduation marks shall conform to the requirements of 8.2.2.1 to 8.2.2.3 and the positions of the marks shall be as shown in Figure 4. 8.4.3 The scale of the long line shall be indicated numerically in millimetres, with 0 at the bottom, 10 in the middle and 20 at the top. 9 Markings
The following shall be permanently marked on the density meter. NOTE The permanence of the marking may be assessed in accordance with the method detailed in ISO 47971. GB/T 21785-2008/150 3507: 1999 The nominal volume digit is followed by a “~” symbol to indicate that the volume is approximate and not precisely adjusted. h) The volume unit is indicated by the “mL” symbol or the “cm” symbol c) As with or in addition to the markings a) and b), a digit is used to indicate the volume determined to the nearest 0.001 mL with respect to temperature.
For example: 49.813 mL at 20 °C (see 3.2). The abbreviations "In\ and \20℃\ refer to the expected nominal volume of the densitometer at 20℃. d
Name or mark of the manufacturer or seller. e
For Class 3, 5 and 6 densitometers, the identification number on the densitometer shall be repeated on the bottle neck or thermometer. Other types of densitometers shall also be marked with the identification number on their caps or stoppers.) For Class 3, 5 and 6 densitometers, the neck and bottle neck or thermometer shall be marked with a short vertical line or marked in a unique position on the neck of the stopper or thermometer. 10 Visibility of scale lines, numbers and markings 10.1 All numbers and markings shall be of a size and shape that is legible under normal use conditions. 10.2 All scale lines, numbers and markings shall be permanently visible under normal use conditions. Filling materials used to improve visibility shall be durable enough to prevent any significant loss of integrity during use. Table 2 First and second US densitometers (see 7.3) Dimensional characteristics
Nominal volume/mL
Difference between effective volume and nominal volume (maximum)/㎡L
Maximum mass (if applicable, type 2 includes lid)/g
Total height A/rm
Height of upper part B (minimum)/ruu
Height from sphere to engraved width C (minimum)/rnm
Distance between vertical discs D/mm
Length of support arm E/mm
Outer diameter of the tube F/mm
Inner diameter of the tube G/mm
Length from the bottom of the sphere to the zero scale H/mm
Length of the sphere H/mm
Outer diameter of the sphere J/mm
Type 1 Lipkin
(see Figure)
175±5
1.1
Type 2 Sprengl
(see Figure 2)
1) IS0 1791 Experimental case Glassware III Method for evaluation of the chemical properties of ceramics used for color end codes and color labels. ±1
GB/T 21785--2008/IS0 3507 : 1999 Table 3 Dimensional requirements for class 4 and class 5 density meter bottles (see 7.3)
Nominal volume/mL
Difference between effective volume and nominal volume (maximum)/
Maximum mass including bottle thickness/g
Neck height A*/mm
Proper diameter B\/umi
Bottom diameter C+/m
Height of stopper F+/mm
Outer diameter of neck F/mm
Neck diameter G/mm
Inner diameter of neck G/mm
Deepness of depression K/mm
Neck opening.
Class 4 Reischauer
(see Figure 4)
2.2 to 3.1
7/11 or 7/16
2 These dimensions are suitable for densitometers of shape in Figures 3 to 5, but may also be varied to suit other suitable styles according to 150383.
5th generation Huhhard
(Figure 5)
24/1024/12
Dimensional requirements for Class 3 and Class 6 density meter bottles (see 7.3) Table 4
Nominal volume/mL
Difference between effective volume and nominal volume (maximum)/m
Including the maximum mass of the bottle oligo/g
Height to the top of the neck A/mm
Body diameter B/mm
Bottom diameter C/rum
Bottle height E'/mm
Neck outer diameter F/m
Bottle aperture G/mm
Neck inner diameter (arm) G-/ mm
Diameter of top of ground neck/mml
Minimum length of neck bottle/mm
Ground neck insert (for thermometer)
Ground neck cone (for food support)
Total length of thermometer/mm
Type 3 Gay-Luaset
(See Figure 3)
7.5±0. 1
Article 6 Type 3 densimeter with a mouthpiece (see Figure 6) These dimensions correspond to the densimeters of the shapes shown in Figures 3 to 5 below, but may also be varied to suit other suitable styles. The neck and bottle of the type 3 densimeter do not match the use of interchangeable ground parts. According to ISO383
1451155
Note: See the definition of symbols in the installation 2.
50r-65
GB/T 21785—2008/ISO 3507:1999 Grass position is meter
Figure 1 Type 1 Lipkin tube densimeter GB/21785-2008/IS0 35071999
Definition of symbols in the table.
In--10 ml
Figure 2 Type 2 Sprengel tube density meter SSER
Note: See symbols in Table 3
GB/T 21785--2008/IS0 3507 1999Figure 3 Type 3 Gay-Lussac bottle density meter e
GB/T 21785--2008/ISO 3507:1999Note: See the definition in Table 3.
Ring mark
In 20 c
19, 006 mt.Www.bzxZ.net
Figure 4 Type 4 Reischaner bottle density meter 101999 Note: See Table 3 for definitions.
Ring mark
In 20 c
19, 006 mt.
Figure 4 Type 4 Reischaner bottle density meter 101999 Note: See Table 3 for definitions.
Ring mark
In 20 c
19, 006 mt.
Figure 4 Type 4 Reischaner bottle density meter 10
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