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JJG 875: Historical versions
| Std ID | Version | USD | Buy | Deliver [PDF] in | Title (Description) |
| JJG 875-2019 | English | 419 |
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Digital Pressure Gauges
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| JJG 875-2005 | English | 679 |
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3 days [Need to translate]
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Verification Regulation of Digital Pressure Gauges
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| JJG 875-1994 | English | 399 |
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Digital pressure gauges
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Basic data
| Standard ID | JJG 875-2019 (JJG875-2019) |
| Description (Translated English) | Digital Pressure Gauges |
| Sector / Industry | Metrology & Measurement Industry Standard |
| Classification of Chinese Standard | A53 |
| Classification of International Standard | 17.100 |
| Word Count Estimation | 18,115 |
| Date of Issue | 2019 |
| Date of Implementation | 2020-03-31 |
| Issuing agency(ies) | State Administration for Market Regulation |
JJG 875-2019: Digital Pressure Gauges
---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.
Digital Pressure Gauges
National Measurement Verification Regulations of the People's Republic of China
Digital pressure gauge
Published on December 31,.2019
2020-03-31 Implementation
Issued by the State Administration of Market Supervision and Administration
Verification Regulation of Digital Pressure Gauge
Replace JJG 875-2005
Centralized unit. National Pressure Measurement Technical Committee
Main drafting unit. China Institute of Testing Technology
Shanghai Institute of Metrology and Testing Technology
Participated in the drafting unit. Zhejiang Institute of Metrology
Beijing Const Instrument Technology Co., Ltd.
Hongqi Instrument Co., Ltd.
This regulation is entrusted to the National Pressure Measurement Technical Committee for interpretation
The main drafters of this regulation.
Gan Rong (China Institute of Testing Technology)
Tu Limeng (Shanghai Institute of Metrology and Testing Technology)
Li Yanling (China Institute of Testing Technology)
Participating drafters.
Hao Luoliang (China Institute of Testing Technology)
Cai Fei (Zhejiang Institute of Metrology)
He Xin (Beijing Const Instrument Technology Co., Ltd.)
Zhou Chunlong (Hongqi Instrument Co., Ltd.)
table of Contents
Introduction (Ⅱ)
1 Scope (1)
2 References (1)
3 Terms and units of measurement (1)
4 Overview (1)
5 Measurement performance requirements (2)
5.1 Indication error (2)
5.2 Return error (2)
5.3 Zero drift (2)
5.4 Periodic stability (2)
5.5 Zero error of static pressure (2)
6 General technical requirements (2)
6.1 Appearance (2)
6.2 Insulation resistance (3)
7 Control of measuring instruments (3)
7.1 Verification conditions (3)
7.2 Verification items (3)
7.3 Verification method (4)
7.4 Processing of verification results (6)
7.5 Verification period (6)
Appendix A Digital Pressure Gauge Verification Record Format (7)
Appendix B Digital Pressure Gauge Verification Certificate (Inner Page) Format (9)
Appendix C Digital Pressure Gauge Verification Results Notice (Inner Page) Format (10)
Appendix D. Additional error correction methods for verification caused by the height difference of the working medium (11)
Introduction
JJF1002-2010 "Rules for Compiling National Measurement Verification Regulations", JJF1001-2011 "General Measurement Terms and
"Definition", JJF1059.1-2012 "Measurement Uncertainty Evaluation and Expression" together form the basis for the revision of this code
Basic series of specifications.
Compared with JJG 875-2005 "Digital Pressure Gauge", in addition to editorial changes, the main technical changes are as follows.
--- According to the requirements of the introduction of JJF1002-2010 "Rules for the Compilation of National Metrological Verification Regulations" as necessary content
Added the introduction part;
--- Added terms and units of measurement;
--- Added 2.5 and 4 levels of accuracy level division;
--- According to actual needs, the division of accuracy level has been adjusted;
--- The concept of measuring range has been re-described;
--- Modified the contents of Appendix A, Appendix B, Appendix C, and Appendix D.
The previous releases of this regulation are.
--- JJG 875-2005;
--- JJG 875-1994.
Verification Regulation of Digital Pressure Gauge
1 Scope
This regulation is applicable to the measurement range not exceeding (-0.1 ~ 500) MPa, the measurement pressure includes positive pressure, negative pressure, differential
The first verification, follow-up verification and in-use inspection of pressure and absolute pressure digital manometers.
2 Reference documents
This regulation refers to the following documents.
JJF1008 Terms and Definitions of Pressure Measurement Terms
For dated references, only the dated versions are applicable to this Regulation; for those without dates
The latest version (including all amendments) is applicable to this regulation.
3 Terms and units of measurement
3.1 Terminology
3.1.1 Digital pressure gauge
The measured pressure acts on the pressure sensor through the pressure transmission medium, which outputs the corresponding electrical signal or digital signal.
The pressure gauge that directly displays the pressure value on the display after processing by the number processing unit.
[JJF1008-2008, definition 6.1]
3.2 Unit of measurement
The legal unit of measurement used by the digital pressure gauge is Pa (Pascal), or its decimal multiple unit. hPa,
kPa, MPa and other measurement units.
4 Overview
Digital pressure gauge is mainly used for pressure measurement of gas and liquid.
Working principle of digital pressure gauge. When the measured pressure acts on the pressure sensor through the pressure transmission medium, the pressure sensor
The corresponding electrical signal or digital signal is processed by the signal processing unit and displayed on the display unit (not limited to the instrument itself,
It can also be a computer equipped with special software) directly display the measured pressure value with numbers.
The schematic diagram of the working principle of the digital pressure gauge is shown in Figure 1.
Classification of digital pressure gauge.
According to the structure, it can be divided into. integral type and separated type.
According to the data reading method, it can be divided into. direct reading type and storage playback type.
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