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JJF 1825-2020 English PDF

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JJF 1825-2020: Calibration Specification for McFarland Bacterial Turbidity Analyzers
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JJF 1825-2020English299 Add to Cart 3 days [Need to translate] Calibration Specification for McFarland Bacterial Turbidity Analyzers Valid JJF 1825-2020

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Basic data

Standard ID JJF 1825-2020 (JJF1825-2020)
Description (Translated English) Calibration Specification for McFarland Bacterial Turbidity Analyzers
Sector / Industry Metrology & Measurement Industry Standard
Classification of Chinese Standard A60
Classification of International Standard 17.180
Word Count Estimation 13,138
Date of Issue 2020
Date of Implementation 2020-04-17
Issuing agency(ies) State Administration for Market Regulation

JJF 1825-2020: Calibration Specification for McFarland Bacterial Turbidity Analyzers

---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.
Calibration Specification for McFarland Bacterial Turbidity Analyzers National Measurement Technical Specification of the People's Republic of China Calibration Specification of McBee Turbidity Analyzer 2020-01-17 release 2020-04-17 Implementation Issued by the State Administration of Market Supervision and Administration Calibration Specification of McBee Turbidity Analyzer Focal point. National Biometrics Technical Committee Main drafting unit. Shanghai Institute of Metrology and Testing Technology Participated in the drafting unit. China Academy of Metrology This specification entrusts the National Biometrics Technical Committee to interpret The main drafters of this specification. Wen Yanli (Shanghai Institute of Measurement and Testing Technology) Xu Li (Shanghai Institute of Metrology and Testing Technology) Gang Liu (Shanghai Institute of Metrology and Testing Technology) Participating drafters. Sui Zhiwei (Chinese Academy of Metrology)

table of Contents

Introduction (Ⅱ) 1 Scope (1) 2 Terms and units of measurement (1) 2.1 McNeil Turbidimetry (1) 2.2 Meyer's unit (1) 3 Overview (1) 4 Measurement characteristics (1) 4.1 Indication stability (1) 4.2 Repeatability (1) 4.3 Indication error (1) 5 Calibration conditions (1) 5.1 Environmental conditions (1) 5.2 Reference Standards for Calibration (1) 6 Calibration items and calibration methods (1) 6.1 Indication stability (1) 6.2 Repeatability (2) 6.3 Indication error (2) 7 Expression of calibration results (2) 8 Recalibration time interval (3) Appendix A Examples of Uncertainty Evaluation of Indication Error Measurement Results (4) Appendix B. Reference Format for Original Calibration Records (6) Appendix C Calibration Certificate (Inner Page) Reference Format (8)

Introduction

In drafting this specification, reference was made to JJG880-2006 "Turbidity Meter", JJF 1059.1-2012 "Measurement Uncertainty "Assessment and Representation", prepared in accordance with the requirements of JJF 1071-2010 "Rules for Compiling National Measurement and Calibration Specifications". This specification is the first release. Calibration Specification of McBee Turbidity Analyzer

1 Scope

This specification applies to the measurement performance of Bacterial Turbidity Analyzer (BacterialTurbidityAnalyzer) calibration.

2 Terminology and units of measurement

2.1 McFarlandmethod The method of estimating the number of bacteria by measuring the light transmission (turbidity value) of the bacterial suspension, the concentration of the bacterial suspension is Within a certain range, it is inversely proportional to the light transmittance and directly proportional to the optical density. 2.2 McFarlandunit The unit of bacterial turbidity measured according to the McNeil turbidimetry is MCF.

3 Overview

The McNair bacterial turbidity analyzer (hereinafter referred to as the instrument) is a method for detecting the scattered light of microorganisms in suspension An instrument that reflects the number of microorganisms. The principle is that the greater the content of microorganisms in the suspension, the less light is transmitted through the suspension, The more light is scattered. It is mainly used for bacterial turbidity in the fields of drug sensitivity evaluation, microbial fermentation and microbial detection Detection.

4 Metering characteristics

4.1 Indication stability 4.2 Repeatability 4.3 Indication error

5 Calibration conditions

5.1 Environmental conditions The operating temperature does not exceed 30 ° C, and the relative humidity ranges from 40% to 80%. During the measurement, the ring should be measured and recorded. Environment temperature and humidity. 5.2 Standard materials for calibration Bacterial turbidity certified reference materials should be used during calibration. 0.5MCF, 1.0MCF, 2.0MCF, 3.0MCF, 4.0MCF), relative expansion uncertainty ≤10% (k = 2).

6 Calibration items and calibration methods

6.1 Indication stability According to the requirements of the instrument manual, if zero adjustment is required, use a bacterial turbidity standard material with a nominal value of 0.0MCF

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