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JJG 919-2023 English PDF

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JJG 919-2023: Verification Meters for pH Meters
Status: Valid

JJG 919: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
JJG 919-2023English419 Add to Cart 4 days [Need to translate] Verification Meters for pH Meters Valid JJG 919-2023
JJG 919-2008English799 Add to Cart 4 days [Need to translate] Verification regulation of verificating meter for pH meters Obsolete JJG 919-2008
JJG 919-1996English279 Add to Cart 3 days [Need to translate] Verification Regulation of Verificating Meter for pH Meter Obsolete JJG 919-1996

Standard similar to JJG 919-2023

JJG 249   JJG 404   JJG 134   

Basic data

Standard ID JJG 919-2023 (JJG919-2023)
Description (Translated English) Verification Meters for pH Meters
Sector / Industry Metrology & Measurement Industry Standard
Word Count Estimation 19,196
Date of Issue 2023-03-15
Date of Implementation 2023-09-15
Issuing agency(ies) State Administration for Market Regulation

JJG 919-2023: Verification Meters for pH Meters

---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 JJG 919-2023 pH meter calibrator Released on 2023-03-15 2023-09-15 Implementation Released by the State Administration for Market Regulation Verification Regulations for pH Meter Calibration Instrument Replace JJG 919-2008 Responsible Unit: National Technical Committee of Physical and Chemical Metrology Main drafting unit: China Institute of Metrology Inner Mongolia Autonomous Region Institute of Metrology and Testing Participating in the drafting unit: Shaanxi Institute of Metrology National Defense Science, Technology and Industry Commission Chemometrics Level 1 Station China Institute of Testing Technology Hunan Institute of Metrology This regulation entrusts the National Physical Chemometrics Technical Committee to be responsible for interpretation The main drafters of this regulation: Xiu Hongyu (National Institute of Metrology) Ning Quan (Inner Mongolia Autonomous Region Institute of Metrology and Testing) Participating drafters: He Xinyang (National Institute of Metrology, China) Yu Deshui (Shaanxi Institute of Metrology) Xun Qining (Level 1 Station of Chemometrics of the Commission of Science, Technology and Industry for National Defense) Zhang Yi (China Academy of Testing Technology) Peng Lihua (Hunan Institute of Metrology)

Table of contents

Introduction (Ⅱ) 1 Scope(1) 2 Overview(1) 3 Metrological performance requirements (1) 4 General technical requirements (1) 4:1 Appearance(1) 4:2 Power up and start up(2) 4:3 Identification(2) 5 Measuring Instrument Control(2) 5:1 Test conditions (2) 5:2 Measurement standards and supporting equipment (3) 5:3 Verification items (3) 5:4 Verification method (3) 5:5 Processing of verification results (6) 5:6 Verification cycle (6) Appendix A (0~100) ℃ k value (7) Appendix B Original Record Format of pH Meter Calibration Instrument Verification (8) Appendix C Format of the inner page of the verification certificate/test result notification (11)

Introduction

This procedure is based on JJF1001-2011 "General Metrology Terms and Definitions", JJF1002-2010 "National Metrology According to the provisions of "Rules for Writing Verification Procedures" and JJF1059:1-2012 "Assessment and Expression of Measurement Uncertainty" revised: During the writing process, JJF1587-2016 "Digital Multimeter Calibration Specification", JJF1638-2017 was referred to Performance indicators and calibration methods of digital multimeters and standard voltage sources in "Multifunctional Standard Source Calibration Specifications": Compared with JJG 919-2008, the main technical changes in this regulation are as follows except editorial modifications: ---Added pH meter calibrator to online pH meter, ion meter, automatic potentiometric titrator, etc: in "Overview" A description of the instrument for electrometric verification (see Chapter 2); --- Added the measurement performance requirements for "pH annual stability" in the "Measurement Performance Requirements", and improved The measurement performance index of the instrument "pH indication value stability" (see Table 1); ---In the "General Technical Requirements", the requirements for wireless connection control using Bluetooth/Wi-Fi or other methods have been added Requirements for split-type pH meter calibrator (see 4:2); ---Added the verification item and verification of "pH annual stability" in "verification items" and "verification methods" Method (see Table 3 and 5:4:4); --- Increased "inner page format of verification certificate/verification result notification" (see Appendix C): The previous releases of this regulation are as follows: ---JJG 919-2008; ---JJG 919-1996: Verification Regulations for pH Meter Calibration Instrument

1 Scope

This regulation is applicable to the initial verification, follow-up verification and in-use inspection of the pH meter calibrator:

2 Overview

The pH meter calibrator is a standard DC voltage signal output device, mainly used for calibrating pH (acidity) meters, Electrometer part of instruments such as ion meter and automatic potentiometric titrator: The pH meter calibration instrument (hereinafter referred to as the calibration instrument) is usually It consists of two parts, one is the standard DC voltage signal generation system of the calibrator, and the other is the high resistance device of the calibrator, which can also be It is called the electric meter input impedance detection system: The high resistance of the calibration instrument should be able to provide resistance values of 1GΩ and 3GΩ respectively: figure 1 A schematic diagram of the tester: (a) Calibration instrument with high resistance in series resistance (b) Calibration instrument with parallel resistance in high resistance Figure 1 Schematic diagram of the calibrating instrument

3 Metering performance requirements

The calibrator is divided into two levels: 0:003 and 0:0006: The 0:003 level calibration instrument is used for 0:01 level and below Electrometer verification of 0:01-level pH meters at all levels: The 0:0006 level calibration instrument is used for all levels of pH meters, ion meters, automatic electric meters Electrometric verification of titrators: The measurement performance requirements of the calibration instrument are listed in Table 1:

4 General technical requirements

4:1 Appearance The appearance of the calibrator is smooth and smooth, and the color is uniform: All function keys work normally, and all fasteners are not loose: attachment, output Outlets, power cords, etc: are complete:

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