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Similar standardsHG/T 20507-2014: Design code for instrument selection---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/HGT20507-2014HG CHEMICAL INDUSTRY STANDARD File No.. J 1809-2014 Replacing HG/T 20507-2000 Design code for instrument selection Issued on. MAY 06, 2014 Implemented on. OCTOBER 01, 2014 Issued by. Ministry of Industry and Information Technology of the People��s Republic of China. Table of ContentsForeword... 5 1 General provisions... 7 2 Terms... 8 3 General requirements... 10 4 Temperature instrument... 11 5 Pressure instrument... 16 6 Flow instrument... 19 7 Level instrument... 27 8 Online analytical instrument... 36 9 Display control instrument... 41 10 Instrument panel... 46 11 Control valve... 47 12 Other instrument... 57 Appendix A -- Selection of flow gauge (normative)... 59 Explanation of wording in this standard... 61 Normative standards... 62 CHEMICAL INDUSTRY STANDARD Design code for instrument selection Main drafting organizations. China Huanqiu Contracting & Engineering Co., Ltd., China Wuhuan Engineering Co., Ltd. Approval authority. Ministry of Industry and Information Technology of the People��s Republic of China Date of implementation. October 1, 20141 General provisions1.0.1 This Code was formulated in order to unify the technical requirements for the selection of measurement and control instruments in the chemical industry, promote the standardization of engineering design for the selection of chemical measurement and control instruments, and achieve the goals of technological advancement, economical rationality, safety and applicability. 1.0.2 This Code is applicable to the selection and design of measurement and control instruments in new construction, expansion and renovation projects in the chemical industry. 1.0.3 In addition to complying with the requirements of this Code, the selection and design of measurement and control instruments shall also comply with the relevant current national standards.2 Terms2.0.1 Accuracy of measurement The degree of consistency between the measured result and the (agreed) true value of the measurand. 2.0.2 Repeatability of measurement The degree of consistency between the results of multiple consecutive measurements of the same measurand by the same measurement method and the same observer, using the same measuring instrument, at the same place, under the same working conditions and repeated within a short period of time. 2.0.3 Measuring range The interval determined by the two values of the measurand measured with specified accuracy. It is also called ��range��. 2.0.4 Proportional action (P-action) The control action in which the change of output variable is proportional to the change of input variable. 2.0.5 Integral action (I-action) The control action in which the change rate of output variable (time derivative) is integrated with the corresponding input variable value (system deviation in the control system). 2.0.6 Derivative action (D-action) The control action in which the value of output variable is derivative with the change rate (first time derivative) of input variable (system deviation in the controller). 2.0.7 Sensor A primary element in a measuring chain that converts input variables into signals suitable for measurement. 2.0.8 Transducer A device that accepts information formed by physical or chemical variables (input variables) and converts it into output variables of the same or other properties according to certain rules. 2.0.9 Transmitter A measurement transducer that converts the output of the measurand into a standardized signal. For example. temperature transmitter, pressure transmitter, flow transmitter, etc.3 General requirements3.0.1 Measurement and control instruments shall be preferably electronic. Pneumatic instruments can be used in special situations. 3.0.2 For electronic instruments installed on site, it shall select the corresponding instrument that meets the hazardous area according to the classification of the hazardous area. The explosion-proof design shall comply with the current national standard ��Electrical apparatus for explosive gas atmospheres�� GB 3836.The selected explosion-proof product shall have an explosion-proof certificate. 3.0.3 The protection degree of the instrument shall comply with the relevant provisions of the current national standard ��Degrees of protection provided by enclosure�� GB 4208. The protection degree of electronic instruments installed on site should not be lower than IP 65, and the protection degree of non-electronic instruments installed on site should not be lower than IP54. 3.0.4 The pressure level of the connection in the process of installing an instrument (throttle device, flowmeter, regulating valve, etc.) with a pipeline shall meet the requirements of the pipeline material grade table.4 Temperature instrument4.1 General requirements 4.1.1 The unit and measuring range of temperature instruments shall meet the following requirements. 4.1.2 The immersion depth of temperature detection elements shall meet the following requirements. 4.1.3 The selection of protective sleeves for temperature detection elements shall meet the following requirements. 4.2 Local temperature gauge 4.2.1 The selection of the accuracy level of local temperature instruments shall meet 4.2.2 The selection of the measuring range of local temperature instruments shall meet the following requirements. 4.3 Temperature instrument for centralized detection 4.3.1 The selection of temperature detection elements shall meet the following requirements. 4.3.2 For position controls and alarms, it can select an electric contact thermometer. 4.3.3 In situations where standard signal transmission is required, it shall use a temperature transmitter. The selection of temperature transmitters shall meet the following requirements. 4.3.4 In situations require measuring the temperature of multiple points, it can select a multi-channel temperature converter, but multi-channel temperature converters must not be used in situations of temperature calculation, control and safety interlocking.5 Pressure instrument5.1 General requirements 5.1.1 The units and measuring range of pressure instruments shall comply with the following provisions. 5.2 Selection of pressure gauge 5.2.1 The selection of pressure measuring instruments shall meet the following requirements. 5.2.2 The selection of pressure measuring instruments for special media shall meet the following requirements. 5.2.6 The selection of the accuracy level of pressure measuring instruments shall meet the following requirements. 5.2.7 The selection of the external dimension of pressure measuring instruments shall meet the following requirements. 5.2.8 The selection of the measuring range of pressure measuring instruments shall meet the following requirements. 5.3 Selection of transmitter 5.3.1 It should select a pressure transmitter for pressure measurement. When measuring tiny pressures (less than 500 Pa), it should select a differential pressure transmitter. 5.3.2 When measuring the differential pressure of equipment or pipelines, it should select a differential pressure transmitter. 5.3.3 When measuring the vacuum pressure, it should select an absolute pressure transmitter.6 Flow instrument6.1 General requirements 6.1.1 This Code is used for the selection of flow instruments under the following conditions. 6.1.2 This Code only covers flow instruments that are currently finalized and proven to be reliable through practical use, mainly including. throttling devices and differential pressure meters; variable area flowmeters (rotor flowmeters); velocity flowmeters; positive displacement flowmeters; electromagnetic flowmeters; ultrasonic flowmeters; Coriolis mass flowmeters; thermal mass flowmeters. 6.2 Selection of differential pressure flowmeter 6.2.1 It should select standard throttling devices for differential pressure flowmeters. The selection of standard throttling devices shall comply with the current national standard ��Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full�� GB/T 2624. 6.2.2 The material of throttling devices shall be at least 304SS. 6.2.3 The selection of standard throttling devices shall meet the following requirements. 6.2.4 It can use non-standard throttling devices under the following circumstances. 6.3 Variable area flowmeter (rotameter) 6.3.1 In fluid measurement situations where the accuracy is not better than level 1.5 and the measuring range ratio is not greater than 10.1, it should select a rotameter. 6.4 Velocity flowmeter 6.4.1 The selection of vortex flowmeters shall meet the following requirements. 6.4.2 When measuring the flow of large-diameter pipelines, it should select an plug-in vortex flowmeter. 6.4.3 The length of the straight pipe section of the vortex flowmeter should be 15D ~ 50D upstream (depending on the piping conditions); when a rectifier is added upstream, the length of the straight pipe section shall not be less than 10D, and shall not be less than 5D downstream. 6.6 Magnetic flowmeter 6.6.1 The magnetic flowmeter should be used for the flow measurement of media with conductivity greater than 5 ��S/cm. 6.6.2 The magnetic flowmeter should be used for the flow measurement of liquid-solid two-phase media.7 Level instrument7.1 General requirements 7.1.1 The level includes liquid level, interface, solid level, etc. 7.2 Liquid level and interface measuring instrument 7.2.1 The selection of magnetic float liquid level gauge shall meet the following requirements. 7.2.2 The selection of glass plate liquid level gauges shall meet the following requirements. 7.2.5 For continuous measurement and positive displacement measurement of liquid level of clean liquids in large storage tanks, as well as positional measurement of liquid level and interface of clean liquids in various storage tanks, it can use a float liquid level gauge (float instruments include servo type, steel belt type, magnetostrictive type, magnetic float type, lever type). The selection of float liquid level gauges shall meet the following requirements. 7.3 Solid level measuring instrument 7.3.1 For continuous and positional measurement of solid level of granular and powdery materials, such as coal, plastic monomers, fertilizers, sand, etc., it should select a capacitive solid level gauge (switch) or radio frequency admittance solid level gauge (switch). The selection of capacitive solid level gauges (switches) or radio frequency admittance solid level gauges (switches) shall meet the following requirements. 7.3.3 For granular and powdery materials with good electrical conductivity, it should select a resistive solid level gauge. The selection of resistive solid level gauges shall be determined based on the measurement reliability, sensitivity and specified electrode-to- ground resistance value of the product.8 Online analytical instrument8.1 General requirements 8.1.1 This clause applies to the selection of online analytical instruments in the chemical production process. 8.1.2 The contents of this clause are not applicable to the selection of portable analytical instruments and laboratory analytical instruments. 8.2 Requirements for sampling pipe 8.2.1 The location of the sampling port should be a place where the measurement medium responds quickly and is representative. 8.3 Preconditioning device 8.3.1 The preconditioning device shall include adjustment and control facilities for sample flow, pressure and temperature. In special cases, it shall also include condensers, coolers, vaporizers, filters or purifiers based on the working conditions and analyzer usage requirements, and a chemical or physical treatment device used to ensure the selectivity of the analytical instrument. 8.3.2 The sample preconditioning unit shall be close to the analytical sampling point, the sample processing unit shall be close to the analytical instrument, and the preconditioning device should be provided as a complete set with the analytical instrument. 8.4 Analytical instrument for liquid service 8.4.1 When measuring media such as distilled water, drinking water, boiler water, pure water and high-purity water with conductivity in the range of 0.05 ��S��cm ~ 1000 ��S��cm, it should select an industrial conductivity analyzer. 8.4.2 When the pH of the liquid medium is in the range of 2 ~ 12, it should select a pH meter. 8.5 Analytical instrument for gas service 8.5.1 When the hydrogen content in the gas is between 0 ~ 100 %, and the thermal conductivity of the background gas is significantly different from that of hydrogen, or the composition of the background gas is relatively stable, it should select a thermal conductivity hydrogen analyzer. 8.5.2 For trace oxygen analysis, it should select an electrochemical or thermochemical oxygen analyzer. 8.5.3 For constant oxygen analysis, it shall select a magnetic oxygen or zirconia oxygen analyzer. 8.5.4 For microanalysis of carbon monoxide and carbon dioxide in gases of which the background gas has no major cross-interference, it should select a thermal conductivity or infrared absorption analyzer. 8.5.5 For constant carbon monoxide analysis, it should select an infrared absorption analyzer. If the gas sample contains a lot of dust and moisture, it can select a thermal conductivity analyzer.9 Display control instrument9.1 General requirements 9.1.1 This clause applies to the selection of panel-mounted display control instruments in chemical automation design. 9.1.2 The selection of display control instruments shall meet the following requirements. 9.1.3 The measurement accuracy of the instrument shall be selected according to the requirements of the process and the importance of the variables. The indicated measurement accuracy shall be better than ��1.00 % and the recorded measurement accuracy shall be better than ��1.50 %. 9.1.4 Commonly used measurement units, instrument scales or measuring range indication values and their usage ranges should comply with the requirements of Table 9.1.4. 9.2 Selection of display instrument 9.2.1 The selection of local display instruments shall meet the following requirements. 9.2.2 The selection of panel-mounted display instruments shall meet the following requirements. 9.3 Selection of control instrument 9.3.1 For the control instruments of the production device, other control instruments such as intelligent instruments with microprocessors, digital display control instruments, electric unit combined (or assembled) instruments, etc. can be used according to needs. 9.3.2 When used in a production process that is not easy to stabilize or is frequently started and stopped, for analog control instruments it should select a full-scale indicating controller rather than a deviation indicating controller; for digital control instruments it should select a controller with light strip indication. 9.3.3 The control rules in the control system shall be determined based on factors such as object characteristics, characteristics of control system equipment components (including detection components, transmitters, control instruments, actuators, etc.), interference forms and required control quality. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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