|
US$489.00 · In stock
Delivery: <= 4 days. True-PDF full-copy in English will be manually translated and delivered via email.
JJG 757-2018: Laboratory Ion Meters
Status: Valid JJG 757: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| JJG 757-2018 | English | 489 |
Add to Cart
|
4 days [Need to translate]
|
Laboratory Ion Meters
| Valid |
JJG 757-2018
|
| JJG 757-2007 | English | RFQ |
ASK
|
6 days [Need to translate]
|
Verification Regulation of Ionometers
| Obsolete |
JJG 757-2007
|
| JJG 757-1991 | English | 599 |
Add to Cart
|
4 days [Need to translate]
|
Verification Regulation for Ionometer
| Obsolete |
JJG 757-1991
|
PDF similar to JJG 757-2018
Basic data | Standard ID | JJG 757-2018 (JJG757-2018) | | Description (Translated English) | Laboratory Ion Meters | | Sector / Industry | Metrology & Measurement Industry Standard | | Classification of Chinese Standard | A55 | | Classification of International Standard | 17.220.20 | | Word Count Estimation | 21,214 | | Date of Issue | 2018-12-25 | | Date of Implementation | 2019-06-25 | | Older Standard (superseded by this standard) | JJG 757-2007 | | Regulation (derived from) | State Administration of Markets, Announcement No.34 of 2018 | | Issuing agency(ies) | State Administration for Market Regulation | | Summary | This standard is applicable to the first verification, subsequent verification and in-use inspection of the laboratory universal ion meter for measuring the ion activity in the solution by the electrode potential method. | JJG 757-2018: Laboratory Ion 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.
Laboratory Ion Meters
National Metrological Verification Regulation of the People's Republic of China
Laboratory ion meter
2018-12-25 released
2019-06-25 implementation
Issued by the State Administration for Market Regulation
Laboratory ion meter verification regulations
Replace JJG 757-2007
Focal point. National Technical Committee of Physical Chemistry Metrology
Main drafting unit. China Academy of Testing Technology
Participated in the drafting unit. Hulunbuir Product Quality Measurement Testing Institute
This regulation entrusts the National Technical Committee of Physical Chemistry Metrology to interpret
The main drafters of this regulation.
Yuan Li (China Academy of Testing Technology)
Xie Qi (China Academy of Testing Technology)
Shao Zhixin (China Academy of Testing Technology)
Participating drafters.
Xijile (Hulunbuir Product Quality Measurement Testing Institute)
table of Contents
Introduction (Ⅱ)
1 scope (1)
2 Overview (1)
3 Measurement performance requirements (1)
4 General technical requirements (2)
4.1 Appearance and preliminary inspection (2)
4.2 Power-on inspection (2)
5 Measuring instrument control (2)
5.1 Verification conditions (2)
5.2 Equipment for verification (2)
5.3 Certified reference materials (3)
5.4 Verification items (3)
5.5 Verification method (4)
5.6 Verification results (7)
5.7 Verification cycle (7)
Appendix A Preparation method of fluoride ion standard solution (8)
Appendix B Original Record Format of Laboratory Ion Meter Verification (9)
Appendix C Inner Page Format of Verification Certificate/Notification of Verification Results (14)
Introduction
This regulation is based on JJF1001-2011 "General Metrology Terms and Definitions", JJF1002-2010 "National Metrology
The "Verification Regulations Compilation Rules" is the basis and basis for revising the JJG 757-2007 "Ion Meter".
Compared with JJG 757-2007 "Ion Meter", in addition to editorial changes, the main technical content has the following changes.
---The name of the procedure was changed to "Laboratory Ion Meter";
---Deleted the measurement performance requirements of class 0.2, class 0.02 and class 0.05 laboratory ion meters;
---Insulation resistance, activity indication error, output error, stability, power supply voltage adaptability, and
Pointer type analog adjustment of the slope regulator range, equipotential regulator adjustment range, positioning regulator adjustment range, etc.
Project;
--- Deleted Appendix A, Appendix B, Appendix C, and Appendix D of the original regulations;
---Modified the environmental conditions for verification (see 5.1);
---Modified the requirements for verification equipment and certified reference materials (see 5.2, 5.3);
---Modified the measurement performance requirements (see Table 1);
---Modified the verification circuit connection diagram (see Figure 1);
---Modified the meter display value error (original display value error), meter input current (original input current), meter input
Impedance (original input impedance), meter reading repeatability (original repeatability), meter pX temperature compensation error (original temperature compensation)
Test methods for items such as compensator error) and temperature indication error (temperature measurement error) (see 5.5.4~5.5.9);
---Increase the instrument pX indication error and instrument pX indication repeatability test method and measurement performance requirements (see
5.5.10 and Table 1);
---The preparation method of Appendix A fluoride ion standard solution has been added.
Previous releases of this regulation.
---JJG 757-2007;
---JJG 757-1991.
Laboratory ion meter
1 Scope
This regulation is applicable to the initial verification and post-examination of laboratory general ion meters for measuring ion activity in solution by electrode potential method.
Continued verification and in-use inspection.
2 overview
Laboratory ion meter (hereinafter referred to as instrument) is an electrochemical analyzer used to measure ion activity in solution
The device is mainly composed of two parts. an electric meter and a measuring electrode. The electricity meter consists of an impedance converter, a potential amplifier, and a function regulator
It is composed of display and measuring electrode including ion selective electrode and reference electrode. Use instrument to measure ion content in solution
When using the comparative method to measure, first measure the battery composed of standard solution, ion selective electrode and reference electrode
Calibrate the ion meter, and then use the same pair of electrodes to measure the solution to be tested, the electromotive force of the battery can be directly
The connection is displayed as a potential value, or it can be displayed as pX or concentration after conversion by an electric meter.
The relationship between the electromotive force E of the battery and the ion activity αx in the measured solution is.
E=E0±
ln10RT
nF lgαx
(1)
Where.
E0---starting potential, V;
R---gas constant, 8.3144598 (48) J·K-1·mol-1;
T---thermodynamic temperature, K;
n---the charge number of the ion;
F---Faraday constant, 96485.33289 (59) C·mol-1.
E0 includes the standard electrode potential, reference electrode potential, and liquid junction potential of the ion-selective electrode.
ln10RT
nF
It is called the theoretical slope of the electrode, expressed by k; if -lgαx is expressed by pX, then the formula (1) is.
E=E0±kpX (2)
When the measured ion is a positive ion, use "-" before k; when the measured ion is a negative ion, use "" before k.
The initial potential E0 is adjusted by the standard solution and ion meter to eliminate.
E=±kpX (3)
In solution, the relationship between ion activity and ion concentration is.
αx=γx·mx (4)
Where.
γx-activity coefficient;
mx---Ion concentration.
3 Measurement performance requirements
The measurement performance requirements of the instrument are shown in Table 1.
Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of JJG 757-2018_English be delivered?Answer: Upon your order, we will start to translate JJG 757-2018_English as soon as possible, and keep you informed of the progress. The lead time is typically 2 ~ 4 working days. The lengthier the document the longer the lead time. Question 2: Can I share the purchased PDF of JJG 757-2018_English with my colleagues?Answer: Yes. The purchased PDF of JJG 757-2018_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+ countriesQuestion 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 [email protected]. 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 757-2018?Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version JJG 757-2018 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.
|