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1、JIS +7505 94 m 493304 0 5 2 1 9 9 TTB = UDC 531.787.1 JIS JAPANESE INDUSTRIAL STANDARD Bourdon tube pressure gauges Translated and Published bY Japanese Standards Association Printed in Japan 11 s COPYRIGHT Japanese Standards Association Licensed by Information Handling Services COPYRIGHT Japanese S
2、tandards Association Licensed by Information Handling Services In the event of any doubt arising, the original Standard in Japanese is to be final authority. COPYRIGHT Japanese Standards Association Licensed by Information Handling Services COPYRIGHT Japanese Standards Association Licensed by Inform
3、ation Handling Services JIS B*7505 94 W 4933608 0522000 254 UDC 531.787.1 JAPANESE INDUSTRIAL STANDARD J I S Bourdon tube pressure gauges B 7505-1994 1. Scope concentric circular type indicating pressure gauges which indicate directly the pressure by magnifying mechanically the amount of transformat
4、ion caused by the pressure of Bourdon tube (hereafter referred to as “Bourdon tube pressure gauge“) and are used for measurement of gauge pressure. This Japanese Industrial Standard specifies the single pointer and Remarks: The following standards are cited in this Standard: JIS B 0202 Parallel pipe
5、 threads JIS B 0203 Taper pipe threads JIS C 1803 General rules for defining expression of the perform- ance of industrial process measurement and control equipment Glossary of terms used in instrumentation Standard atmospheric conditions for testing JIS Z 8103 JIS Z 8703 2. Definitions JIS Z 8103,
6、apply to the main terms used in this Standard: The following definitions, in addition to those specified in (1) gauge pressure Pressure which is expressed in reference to the atmospheric pressure or the ambient pressure and different from the absolute pressure. When making the atmospheric pressure o
7、r the ambient pressure zero, the higher pressure and the lower pressure than it are called the positive gauge pressure and the negative gauge pressure respectively (see Fig. 1). Fig. 1 Classification of pressure Positive gauge pressure f Y Zero of gauge pressure (Atmospheric pressure or ambient pres
8、sure) Negative gauge pressure J. Zero of absolute pressure COPYRIGHT Japanese Standards Association Licensed by Information Handling Services COPYRIGHT Japanese Standards Association Licensed by Information Handling Services J I S BX7505 94 M 4933b08 0522002 190 M 2 B 7505-1994 pressure gauge Gauge
9、for measuring the positive gauge pressure. vacuum gauge Gauge for measuring the negative gauge pressure. compound pressure gauge gauge pressures. Its scale consists of the pressure part indicating the positive gauge pressure and the vacuum part indicating the negative gauge pressure. Gauge for measu
10、ring the positive and negative maximum pressure The value of pressure corresponding to the maximum scale mark. In the case of compound pressure gauge, the values of pressure corresponding to the maximum scale mark in both pressure part and vacuum part. pressure span the difference between the maximu
11、m pressure and the minimum pressure. In the case of compound pressure gauge, the sum of the absolute value of maximum pressure at the pressure part and the absolute value of maximum pressure at the vacuum part. The value of pressure corresponding to scale span. Namely, steady pressure ously at a spe
12、ed not exceeding 1% of the pressure span per second and that the amount of the pressure variation per minute does not exceed 5% of pressure span. Invariable pressure or the pressure that varies continu- variable pressure pressure span per second. The pressure which varies at a speed of 1% to 10% of
13、Name of principal parts The name of principal parts of the Bourdon tube pressure gauge shall be as shown in Fig, 2. COPYRIGHT Japanese Standards Association Licensed by Information Handling Services COPYRIGHT Japanese Standards Association Licensed by Information Handling Services J I S B*7505 94 49
14、33608 0522002 O27 i 3 B 7505-1994 Fig. 2 Name of principal parts Circular Front rim Case rim Center stock Reverse Btock Connecting screw thread 4. Unit of pressure for the Bourdon tube pressure gauge, megapascal (MPa) or kilopascal (kPa) shall be used. Until March 31, 1995, weight Kilogram per squar
15、e centimeter (symbol, kgf/ cm2) or mercury column height in centimeter (symbol, cmHg) is allowed to be used provided that the mercury column height in centimeter is limited to the vacuum part. The unit of pressure shall be pascal (symbol, Pa) and, 5. Accuracy class and tolerance The Bourdon tube pre
16、ssure gauge shall be divided into five classes of class 0.6, class 1.0, class 1.6, class 2.5 and class 4.0 according to the accuracy. The tolerances on the accuracy class are shown in Table 1 and the symbols in Table 2. COPYRIGHT Japanese Standards Association Licensed by Information Handling Servic
17、es COPYRIGHT Japanese Standards Association Licensed by Information Handling Services JIS B*7505 74 W 4933608 0522003 Tb3 Accuracy class Class 0.6 4 B 7505-1994 Tolerance() Range of scale A(2) Range of scale B(3) 10.6 IO.9 Table 1. Tolerance on accuracy class Unit: % Class 1.0 Class 1.6 Class 2.5 fl
18、.O 33.5 11.6 12.4 22.5 13.8 Class 4.0 i 14.0 f6.0 Notes (I) The value of tolerance shall be expressed by percent- age to the pressure span. (2) The range of scale A is made by subtracting 10% of each end of pressure span and 5% each of upper and lower parts of zero point of compound pressure gauge.
19、(3) The range of scale B is made of 10% of each end of pressure span and 5% each of upper and lower parts of zero point of compound pressure gauge. Table 2. Symbol for accuracy class Accuracy class Symbol I CL 0.6 CL 1.0 CL 1.6 CL 2.5 CL 4.0 6. Scale The scale of Bourdon tube pressure gauge shall be
20、 as follows: (1) Maximum scale mark (a) The maximum scale mark of pressure gauge and the maximum scale mark of pressure part of compound pressure gauge shall be 1.0 x lo“, 1.6 x lo“, 2.5 x lo“, 4.0 x 10“ and 6.0 x 10“ (n is positive integer, negative integer or zero). (b) The maximum scale mark of v
21、acuum gauge and the maximum scale mark of vacuum part of compound pressure gauge shall be -1.0 x 10“ (n is positive integer, negative integer or zero). COPYRIGHT Japanese Standards Association Licensed by Information Handling Services COPYRIGHT Japanese Standards Association Licensed by Information
22、Handling Services JIS B*7505 94 4933608 0522004 9TT 7. 7.1 5 B 7505-1994 Subscale mark more (but not wider than l/5 of scale spacing) and of the same length for all of them put side by side in the direction toward the center on the equal radius location. The equally divided scale marks shall be of e
23、qual spacing and the mark at every two, five or ten shall be a little longer than others. The subscale mark shall be of the width of 0.2 mm or Main scale mark subscale mark (but not wider than 1/3 of scale spacing) and the length longer The main scale mark shall be of wider than that of than that of
24、 subscale mark. Scale interval positive integer, negative integer or zero) and be close to the value of the tolerance in Table 1 (not exceeding twice). The scale interval shall be 1 x lo“, 2 x 10“ or 5 x 10“ (n is Scale numbering multiple not be used. The numbering shall be arranged on zero, the max
25、imum scale mark and the appropriate main scale mark in the case of equally divided scale. The indicated value shall be described as it is and the Direction of scale and the pressure part of compound pressure gauge, and counterclockwise in the vacuum gauge and the vacuum part of compound pressure gau
26、ge. The value shall increase clockwise in the pressure gauge Angle of scale equally on the left and right sides. If other angle is required, it shall be based on the agreement between the parties concerned with delivery. The scale shall be approximately 270“ in total allotted Vacuum scale vacuum par
27、t of compound pressure gauge shall be distinguished clearly from the pressure part by means of color, symbol (-) and the like. The scale and numbering in the vacuum gauge and the Double scale tion indicating other unit than that of pressure, the scale for pressure (Pa) shall be placed inside. When t
28、he double scale is made by giving together the gradua- Classification . Classification according to measuring pressure The classification of Bourdon tube pressure gauges according to measuring pressure shall be divided into pressure gauges, vacuum gauges and compound pressure gauges. 7.2 Classificat
29、ion according to size shown by the outer diameter (mm) of dial scale plate shall be 50 mm, 60 mm, 75 mm, 100 mm, 150 mm and 200 mm. The size of Bourdon tube pressure gauges COPYRIGHT Japanese Standards Association Licensed by Information Handling Services COPYRIGHT Japanese Standards Association Lic
30、ensed by Information Handling Services J I S B*7505 94 = 4933b08 0522005 83b = 6 B 7505-1994 7.3 Classification according to use The classification of Bourdon tube pressure gauges according to the use shall be ordinary type, ordinary type for steam, heatproof type, vibration-proof type, vibration-pr
31、oof type for steam and heatproof/ vibration-proof type, and be as follows: (i) Ordinary type The ordinary type Bourdon tube pressure gauge is that used under the following conditions (general conditions): (1.1) The environment surrounding the mounting place shall be Class CJ3 Envi- ronmental Divisio
32、n C in JIS C 1803. (1.2) It shall be mounted in a posture designated by the manufacturer. (1.3) Such vibration or impact that makes the pointer fluctuate with the ampli- tude exceeding the tolerance shown in Table 1 shall not be given. (1.4) The medium for measuring pressure shall be noncorrosive li
33、quid, steam or gas (in accordance with the agreement between the parties concerned with delivery). (1.5) The upper limit of working pressure range shall not be larger than the fol- lowing values: (a) For steady pressure, 3/4 of the maximum pressure (2/3, if the maximum pressure is 100 MPa or more).
34、(b) For variable pressure, 2/3 of the maximum pressure (l/2, if the maximum pressure is 100 MPa or more). (e) For vacuum pressure, the maximum pressure. (2) Ordinary type for steam The ordinary type for steam Bourdon tube pressure gauge shall be that used by mounting on the place where ambient tempe
35、rature is 10C to 50C and capable of withstanding the instantaneous high tempera- ture as in the case of the steam at the time of starting operation. The symbol for its classification according to use shall be M. For adhering the Bourdon tube, the usual solder is not suitable and those having the hea
36、t resistance equal to or higher than the high temperature solder shall be used. (3) Heatproof type The heatproof type Bourdon tube pressure gauge shall be that used by mounting on the place where the ambient temperature comes to 80C in maximum. The symbol for its classification according to use shal
37、l be H. For those used at the temperature higher than this or lower than -5“C, the materials and the manufacturing method shall be given the due consideration so as to be able to withstand the condition. COPYRIGHT Japanese Standards Association Licensed by Information Handling Services COPYRIGHT Jap
38、anese Standards Association Licensed by Information Handling Services J I S BX7505 94 4933608 O522006 772 M 7 B 7505-1994 Vibration-proof type gauge shall be that the vibration proof of which is improved by elevating the natural frequency of Bourdon tube, lightening the moving parts in inner mechani
39、sm, widening the contact zone of moving parts in inner mechanism and other ways. The symbol for its classification according to use shall be V. In addition, there are those containing oil in a case for the purpose of im- proving vibration proof and durability by putting the relatively high viscosity
40、 liquid such as glyceline, silicone oil, etc. For these oils, the careful treatment is required as the measures to be taken against the deterioration caused by atmosphere or lapse of time or the leakage during transportation. The vibration-proof type Bourdon tube pressure Vibration-proof type for st
41、eam The vibration-proof type for steam Bourdon tube pressure gauge shall be that having the characteristics of both ordinary type kor steam-and vibration-proof type.- The symbol for its classification according to use shall be MV. Heatproofhibration-proof type tube pressure gauge shall be that havin
42、g the characteristics of both heatproof The heatproofhibration-proof type Bourdon type and vibration-proof type. The symbol for its classification according to use shall be HV. Performance test item The test items for Bourdon tube pressure gauge shall be as shown in Table 3 according to the division
43、 of classification based on use. Table 3. Performance test Classification according to use Remarks: The test given the mark of O shall be carried out. COPYRIGHT Japanese Standards Association Licensed by Information Handling Services COPYRIGHT Japanese Standards Association Licensed by Information H
44、andling Services J I S B*W7505 94 4933b08 0522007 609 8 B 7505-1994 9. Performance test 9.1 9.2 (1) (7) General The conditions shall be as specified in 9.2 and 9.3. The type inspection shall be in accordance with 9.4 to 9.9. General conditions The general conditions shall be as follows: For standard
45、 instrument, standard manometer, standard dead weight pres- sure tester or standard pressure gauge shall be used. The instrumental error of standard instrument shall not exceed 1/4 of the tolerance in Table 1. The pressure transmitting medium to be used shall be the noncorrosive gas or liquid that t
46、he manufacturer recommends. If it is impossible to do so, a separator is allowed to be used, provided that it does not exert a greater influ- ence than of the tolerance in Table 1. Mounting shall be in a posture the manufacturer designates. The one with zero adjustment device shall be tested after a
47、djusting zero point. In the case where the pressure transmission medium is liquid, it shall be mounted in a manner so as not to create any influence by the static pressure of liquid column. If there is any influence, it shall be corrected. The test, except the heatproof test, shall be carried out un
48、der the condition of standard atmospheric temperature 20I5“C (20f2“C for the one of class 0.6) specified in JIS Z 8703. When carrying out at other ambient temperature and the error of temperature exceeding 1/5 of the tolerance in Table 1 arises, it shall be corrected. In increasing and decreasing th
49、e pressure, it shall be applied slowly and continuously so that the influence by inertia does not arise. In the pulsating pressure test, however, the provision in 9.7 applies. There shall not be such vibration or impact that causes the fluctuation of indication exceeding /io of one scale division. In the pulsating pressure test and the vibration-proof test, however, the provisions in 9.7 and 9.8 apply. In the case where the test pressure does not indicate the maximum vacuum scale due to low atmospheric pressure in the vacuum gauge and the vacuum part of compound pressure