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JJG 165-2024 English PDF

Q: How long will the true-PDF of English version of JJG 165-2024 be delivered?

Upon your order, we will start to translate JJG 165-2024_English as soon as possible, and keep you informed of the progress. The lead time is typically 4 ~ 6 working days. The lengthier the document the longer the lead time.

Q: Can I share the purchased PDF of JJG 165-2024_English with my colleagues?

Yes. The purchased PDF of JJG 165-2024_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.

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Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries). Avoidance of Double Taxation Agreements (DTAs) between Singapore and 100+ Countries: https://www.iras.gov.sg/taxes/international-tax

Q: Do you accept my currency other than USD?

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Q: Should I purchase the latest version JJG 165-2024?

Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version JJG 165-2024 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.

US$799.00 · In stock
Delivery: <= 6 days. True-PDF full-copy in English will be manually translated and delivered via email.
JJG 165-2024: Verification Regulation of Standard Bell Provers of Gas Flow
Status: Valid

JJG 165: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
JJG 165-2024	799	Add to Cart	6 days	Verification Regulation of Standard Bell Provers of Gas Flow	Valid
JJG 165-2005	629	Add to Cart	5 days	Verification Regulation of Standard Bell Porvers of Gas Flow	Valid
JJG 165-1989	719	Add to Cart	5 days	Standard Bell Porver	Obsolete
JJG 165-1975	RFQ	ASK	3 days	(Chinese Industry Standard)	Obsolete

Basic data

Standard ID: JJG 165-2024 (JJG165-2024)
Description (Translated English): Verification Regulation of Standard Bell Provers of Gas Flow
Sector / Industry: Metrology & Measurement Industry Standard
Word Count Estimation: 39,348
Date of Issue: 2024-10-19
Date of Implementation: 2025-04-19
Issuing agency(ies): State Administration for Market Regulation

JJG 165-2024: Verification Regulation of Standard Bell Provers of Gas Flow

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
National Metrology Verification Regulations of the People's Republic of China Verification procedures for bell-type gas flow standard devices Released on 2024-10-19 2025-04-19 Implementation The State Administration for Market Regulation issued Bell-type gas flow standard device Verification procedures Replaces JJG 165-2005 Responsible unit. National Flow Measurement Technical Committee Main drafting unit. Beijing Institute of Metrology and Testing Science China National Institute of Metrology Zhejiang Institute of Metrology Shandong Institute of Metrology Participating in the drafting. Shanghai Institute of Metrology and Testing Technology Hangzhou Tianma Metrology Technology Co., Ltd. Dandong Ketai Instrument Co., Ltd. This regulation is entrusted to the National Flow Measurement Technical Committee for interpretation The main drafters of this regulation are. Yang Youtao (Beijing Institute of Metrology and Testing Science) Gao Feng (China National Institute of Metrology) Chen Shangshun (Zhejiang Institute of Metrology) Gao Jinsheng (Shandong Institute of Metrology) Participating drafters. Liu Yiping (Shanghai Institute of Metrology and Testing Technology) Ma Xiaoping (Hangzhou Tianma Metrology Technology Co., Ltd.) Wang Fugui (Dandong Ketai Instrument Co., Ltd.)

Introduction (III) 1 Scope(1) 2 References(1) 3 Terminology and units of measurement (1) 3.1 Terminology (1) 3.2 Units of measurement (2) 4 Overview(2) 4.1 Working Principle(2) 4.2 Purpose(2) 4.3 Structure (2) 4.4 Classification (5) 4.5 Nameplates and markings(5) 5 Metrological performance requirements (5) 5.1 Accuracy level and uncertainty (5) 5.2 Measuring range(6) 6 General Technical Requirements (6) 6.1 Sealing (6) 6.2 Sealing fluid (6) 6.3 Pressure fluctuations (6) 6.4 Temperature difference control (6) 6.5 Timer(6) 7 Measuring instrument control (6) 7.1 Verification conditions (7) 7.2 Verification Items (8) 7.3 Verification methods (8) 8 Processing of test results (14) 9 Verification cycle (14) Appendix A Example of uncertainty assessment for bell jar flow measurement (15) Appendix B Dynamic Mass Method Verification Standard Volume (25) Appendix C Cover Roundness (26) Appendix D Temperature Linear Expansion Coefficients of Common Metal Materials (28) Appendix E Bell Jar Pulse Coefficient (29) Appendix F Verification of measurement deviation (31) Appendix G Format of the inner page of the verification certificate (reference) (32)

Introduction

JJF1001 "General metrological terms and definitions", JJF1002 "Rules for the preparation of national metrological verification procedures" and JJF1059.1 "Evaluation and Expression of Uncertainty in Measurement" together constitute the basic documents supporting the revision of this regulation. The bell-shaped gas flow standard device is a classic atmospheric pressure gas flow standard device. Through the tracing of each component to the length, mass and time base, the focus is on the static volume of the bell jar, lacking the convection There is no verification of the value of measurement, and there is also a lack of verification of the consistency of the values between different devices. The bell jar volume verification includes static volume method, ruler method, There are many methods such as dimensional measurement method, dynamic volume method and dynamic mass method, but these methods are only for the standard volume of the static standard volume of the bell jar. The accurate transmission of gas flow value by the bell jar requires flow value verification, which is the key issue to be solved in this regulation. The problem requires that the standard table method be used to verify the bell jar flow rate based on the size method, volume method or mass method to verify the bell jar volume. At present, most bell jar devices are equipped with measurement control The measurement and control system of the device significantly affects its measurement performance. This regulation adds some relevant content about measurement control system. Compared with JJG 165-2005, the main changes of this regulation are as follows. --- According to the requirements of JJF1002, the introduction part is added; ---According to work needs and convenient operation, a 0.3-level bell cover is added; --- Added the dimension measurement formula of the bell with liquid level compensation mechanism; --- Added verification of bell value, making up for the correlation of flow value between upper and lower bells; --- Added some relevant content of bell housing with measurement and control system; --- Added technical requirements for roundness for newly manufactured bell jars. Previous versions of this regulation are as follows. ---JJG 165-2005; ---JJG 165-1989; ---JJG 165-1975. Verification procedures for bell-type gas flow standard devices

1 Scope

This regulation applies to the first test of the bell-shaped gas flow standard device (hereinafter referred to as the bell) with air as the test medium. Calibration, subsequent calibration and in-use inspection.

2 References

This regulation refers to the following documents. JJF1001 General metrological terms and definitions JJF1004 Flow measurement terms and definitions JJF1059.1 Evaluation and Expression of Measurement Uncertainty JB/T 12961-2016 Bell-type gas flow standard device For any referenced document with a date, only the version with the date is applicable to this Regulation; for any referenced document without a date, The latest version (including all amendments) shall apply to this regulation.

3 Terminology and units of measurement

3.1 Terminology The terms and definitions defined in JJF1001, JJF1004 and the following apply to this regulation. Using gas as the medium, a movable bell jar and sealing liquid are used to form a gas standard measuring chamber with variable volume. The output flow rate is stable and the volume of the gas is known, which is a standard device for detecting gas flow meters. 3.1.2 Cylinder of bell prover A cylindrical container that is placed upside down in a liquid tank and can move freely up and down. 3.1.3 Tank for sealing liquid An open cylindrical container that holds sealing liquid. Compensate for the change in pressure inside the bell jar caused by the change in buoyancy during the operation of the bell jar, so that the pressure inside the bell jar remains constant. mechanism. Compensate for changes in the liquid level of the bell during operation, so that the bell can maintain the liquid level of the sealing liquid during operation The mechanical counterweight mechanism remains unchanged. 3.1.6 Signal generator A non-contact switch that can send a signal to control the start and stop of a timer/counter. Note. There are many types such as electromagnetic, photoelectric, infrared, etc. 3.1.7 Timer (module) timer ......

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Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of JJG 165-2024_English be delivered?

Answer: Upon your order, we will start to translate JJG 165-2024_English as soon as possible, and keep you informed of the progress. The lead time is typically 4 ~ 6 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of JJG 165-2024_English with my colleagues?

Answer: Yes. The purchased PDF of JJG 165-2024_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.

Question 3: Does the price include tax/VAT?

Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countries

Question 4: Do you accept my currency other than USD?

Answer: Yes. If you need your currency to be printed on the invoice, please write an email to Sales@ChineseStandard.net. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.

Question 5: Should I purchase the latest version JJG 165-2024?

Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version JJG 165-2024 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.