BS EN ISO 3104:2020 pdf download.Petroleum products – Transparent and opaque liquids – Determination of kinematic viscosity and calculation of dynamic viscosity.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 3105, Glass capillary kinematic viscometers — Specifications and operating instructions
ISO 3696:1987, Water for analytical laboratory use — Specification and test methods
ASTM E1137, Standard Specification for Industrial Platinum Resistance Thermometers
ASTM E2877, Standard Guide for Digital Contact Thermometers
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at http:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org
4 Principle
The time is measured for a fixed volume of liquid to flow under gravity through the glass capillary
of a calibrated viscometer under a reproducible driving head and at a known and closely controlled
temperature. The kinematic viscosity is the product of the measured flow time and the calibration
constant of the viscometer.
5 Reagents and materials
5.1 Cleaning solution, strongly-oxidizing cleaning solution or alkaline cleaning solutions can be used.
Alkaline cleaning solutions with a pH of greater than 10 are not recommended as they have been shown to change the viscometer calibration. If these are used, then the viscometer calibration should be verified to ensure there is no change.
5.2 Sample solvent, completely miscible a prewash with an aromatic solvent such as toluene or
heptane might be necessary to remove asphaltenic material. When cleaning capillaries inside the bath, the boiling point of the cleaning solution shall be higher than the bath temperature.
5.3 Drying solvent, suitable and volatile at the used temperature. Filter before use. If moisture
remains, use a drying solvent miscible with water (5.4).
NOTE When cleaning capillaries inside the bath and if the bath temperature is higher than 50 °C, acetone is not suitable.
5.4 Water, deionized or distilled, conforming to Grade 3 of ISO 3696:1987. Filter before use.
6 Apparatus design and requirements
6.1 Drying tubes, consisting of a desiccant drying system, consisting of either externally mounted
drying tubes or an integrated desiccant drying system designed to remove ambient moisture from the capillary tube. Ensure that they are packed loosely and that the desiccant is not saturated with water.
6.2 Sample filter, micron screen or fretted (sintered) glass filter, no more than 75 µm.
6.3 Reagent filter, micron screen or fretted (sintered) glass filter, no more than 11 µm.
6.4 Ultrasonic bath, unheated — with an operating frequency between 25 kHz to 60 kHz and a typical power output of ≤100 W, of suitable dimensions to hold container(s) placed inside of bath, for use in effectively dissipating and removing air or gas bubbles that can be entrained in viscous sample types prior to analysis. It is permissible to use ultra-sonic baths with operating frequencies and power outputs outside this range; however, it is the responsibility of the laboratory to conduct a data comparison study to confirm that results determined with and without the use of such ultrasonic baths does not materially impact results.BS EN ISO 3104 pdf download.