ISO 5661:1983 PDF

Name: ISO 5661:1983 — Petroleum products — Hydrocarbon liquids — Determination of refractive index
SKU: ISO 5661:1983
Price: 25 EUR
Availability: InStock

Petroleum products — Hydrocarbon liquids — Determination of refractive index

Название (английский):

ISO 5661:1983

Petroleum products — Hydrocarbon liquids — Determination of refractive index

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 2
Дата публикации:: 1 октября 1983 г.
Издание:: ISO IS 5661 edition 1 version 1
ICS:: 75.080

Тип поставки:

Full version30 €Read online 24h10 €Read online 72h15 €

Язык документа:

ruen

Срок поставки:1 раб. дн. (перевод)

Цена:30 €

Описание (английский):

Gives a method for the determination of this quantity of transparent and light-coloured hydrocarbon liquids such as are used in capacitors, transformers, circuit breakers and in cables of the oil-filled type. This method is applicable to liquids having indices in the range 1,33 to 1,7 and at temperatures of 20 to 30 degrees centigrade. It is not applicable, within the accuracy stated of liquids having bubble points so close to the test temperature that a reading cannot be obtained before substantial deterioration takes place.

Abstract

Похожие стандарты

Упомянутые в описании и другие стандарты ISO

Overview

ISO 5661:1983 is an international standard specifying a precise method for determining the refractive index of transparent and light-colored hydrocarbon liquids used in electrical equipment such as capacitors, transformers, circuit breakers, and oil-filled cables. The method is suitable for liquids with refractive indices ranging from 1.33 to 1.7, measured at temperatures between 20°C and 30°C. It is primarily intended for clear hydrocarbon liquids and excludes dark-colored or unstable samples whose bubble points are too close to the test temperature.

This standardized approach ensures reliable optical characterization of petroleum products and hydrocarbon liquids, helping to assess their purity, quality, and potential contamination after usage.

Key Topics

Scope of Application The method applies to transparent, light-colored hydrocarbon liquids with refractive indices in the 1.33–1.7 range. It is ideal for mineral oils in electrical applications but not suited for heavily colored or thermally unstable liquids.

Definition of Refractive Index The refractive index measured is the ratio of light velocity in air to that in the liquid, typically using sodium light with a wavelength of 589.3 nm at standard test temperatures.

Measurement Conditions Testing occurs at controlled temperatures (20°C to 30°C), requiring precise temperature control within ±0.1°C, because refractive index varies with temperature and light wavelength.

Apparatus Requirements A critical angle-type refractometer with 0.0002 accuracy is used, combined with certified optical reference materials for calibration. Instruments may be equipped with compensating prisms and require stable monochromatic or white light sources.

Test Procedure Samples are applied to the prism surface and allowed to equilibrate thermally. The refractometer is adjusted to align the field division, and readings are taken through a microscope to four decimal places. Multiple readings are averaged for accuracy.

Accuracy and Limitations The standard provides an accuracy of ±0.0003 within the reference calibration range (1.33 to 1.5). It does not cover higher refractive indices or liquids with high contamination or unstable physical properties near the test temperature.

Applications

Quality Control in Petroleum Products Monitoring the refractive index helps detect compositional changes or contamination in hydrocarbon liquids, especially after service in transformers or capacitors where oil degradation may occur.

Electrical Industry Ensuring the optical quality of insulating oils in capacitors, circuit breakers, and oil-filled cables supports safe and efficient electrical equipment performance.

Petroleum Refining and Research The refractive index serves as a key parameter when characterizing hydrocarbon fractions and blends, contributing to refining processes and product specification.

Reference for Optical Testing ISO 5661 provides baseline test procedures used alongside other properties like density and color, enabling comprehensive petroleum product analysis.

Related Standards

ISO 2049 – Petroleum products - Determination of color Useful for assessing the color quality of petroleum liquids, which complements refractive index measurements.

ISO 2719 – Determination of flash point Important for safety and quality, often assessed alongside refractive index in fuel and oil testing.

ASTM D1218 – Standard Test Method for Refractive Index of Crude Petroleum and Petroleum Products Provides similar methods that may be used for comparative or supplementary testing.

By adhering to ISO 5661:1983, laboratories and industries handling hydrocarbon liquids can achieve consistent, accurate assessments of refractive index, ensuring product quality and operational safety in various applications.

ISO 5661:1983 PDF

Abstract

Похожие стандарты

Overview

Key Topics

Applications

Related Standards

Технические детали

BS ISO 20494:2017

Paper. Requirements for stability for general graphic applications.

SIST EN ISO 2719:2026

Determination of flash point - Pensky-Martens closed cup method (ISO 2719:2025)

ISO 8689-1:2000

Water quality — Biological classification of rivers — Part 1: Guidance on the interpretation of biological qu…

ISO/ASTM51540-04(2012)

Standard Practice for Use of a Radiochromic Liquid Dosimetry System (Withdrawn 2020)

ISO/ASTM51204-04

Standard Practice for Dosimetry in Gamma Irradiation Facilities for Food Processing (Withdrawn 2013)

ISO/ASTM51431-05

Standard Practice for Dosimetry in Electron Beam and X-Ray (Bremsstrahlung) Irradiation Facilities for Food P…

ISO/ASTM52628-20e1

Standard Practice for Dosimetry in Radiation Processing

ISO/ASTM52921-13(2019)

Standard Terminology for Additive Manufacturing—Coordinate Systems and Test Methodologies