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GB/T 41633.2-2022Insulating liquids - Determination of acidity - Part 2: Colourimetric titration (English PDF)

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Issued by

State Administration for Market Regulation, China National Standardization Administration

Level / Type

National · Recommended

Issue date

July 11, 2022

Implementation date

February 1, 2023

Scope

GB/T 41633.2-2022 (Insulating liquids - Determination of acidity - Part 2: Colourimetric titration) is available as an English-translated PDF.

GB/T 41633.2-2022 is the Chinese standard "Insulating liquids - Determination of acidity - Part 2: Colourimetric titration". Its scope clause reads: This document describes the method and procedure for determining the acid value of insulating liquids by colorimetric titration.

This document applies to both unused and used electrical insulating liquids. Note. In unused and used insulating liquids, acidic components include organic acids, phenolic compounds, oxidation products, resins, metal organic salts and additives Additives. Its clauses include terms and definitions.

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Document preview — GB/T 41633.2-2022

National Standard of the People's Republic of China

Classification: K 15

Issued by: State Administration for Market Regulation, China National Standardization Administration

Preface
Introduction
1 Scope
2 Normative references
3 Terms and Definitions
4 Method overview
5 Reagent
5.1 Distilled water
5.2 Titration reagent
5.3 Titration solvent
5.4 Potassium hydrogen phthalate
5.5 Hydrochloric acid standard solution
5.6 Basic Blue 6B Indicator
5.7 Cobalt nitrate solution
6 Instrument
7 Sampling
8 Measurement step
8.1 Overview
8.2 Calibration of potassium hydroxide standard solution
8.3 Blank titration
8.4 Sample titration
9 Result calculation
10 Precision
10.1 General
10.2 Repeatability
10.3 Reproducibility
11 records

1 Scope

This document describes the method and procedure for determining the acid value of insulating liquids by colorimetric titration.

This document applies to both unused and used electrical insulating liquids.

Note. In unused and used insulating liquids, acidic components include organic acids, phenolic compounds, oxidation products, resins, metal organic salts and additives

Additives.

2 Normative references

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, dated citations documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to this document.

GB/T 6379 (all parts) Accuracy (correctness and precision) of measurement methods and results [ISO 5725 (all parts)]

Note. GB/T 6379.1-2004 Accuracy (correctness and precision) of measurement methods and results - Part 1.General provisions and definitions (ISO 5725-1.

1994, IDT)

GB/T 6379.2-2004 Accuracy (correctness and precision) of measurement methods and results - Part 2.Determining the repeatability and repeatability of standard measurement methods

Basic methods of presentability (ISO 5725-2.1994, IDT)

GB/T 6379.3-2012 Accuracy (correctness and precision) of measurement methods and results - Part 3.Intermediateness of precision of standard measurement methods

Quantity (ISO 5725-3.1994, IDT)

GB/T 6379.4-2006 Accuracy (Correctness and Precision) of Measurement Methods and Results - Part 4.Basis for Determining the Accuracy of Standard Measurement Methods

This method (ISO 5725-4.1994, IDT)

GB/T 6379.5-2006 Accuracy (correctness and precision) of measurement methods and results - Part 5.Determining the accuracy of standard measurement methods

Alternative method (ISO 5725-5.1998, IDT)

GB/T 6379.6-2009 Accuracy of Measurement Methods and Results (Correctness and Precision) Part 6.Practical Application of Accuracy Values (ISO 5725-6.1994, IDT)

GB/T 6682 Analysis Laboratory Water Specifications and Test Methods (GB/T 6682-2008, ISO 3696.1987, MOD)

GB/T 41146 Sampling method for insulating liquids (GB/T 41146-2021, IEC 60475.2011, IDT)

3 Terms and Definitions

The following terms and definitions apply to this document.

3.1 acidity

The amount of alkali (in KOH) required to titrate the sample to the neutralization point of Basic Blue 6B with the specified solvent.

Note. The unit is milligrams per gram (mg/g). […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 19 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 6379 · ISO 5725 · ISO 3696.1987 · IEC 60475.2011

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