EN ISO 15212-1:1999
(Main)Oscillation-type density meters - Part 1: Laboratory instruments (ISO 15212-1:1998)
Oscillation-type density meters - Part 1: Laboratory instruments (ISO 15212-1:1998)
The standard specifies metrological and other requirements for density meters of the oscillation type, which are used in laboratories for homogeneous fluid samples. A method for adjustment and calibration is given.
Dichtemeßgeräte nach dem Schwingerprinzip - Teil 1: Laborgeräte (ISO 15212-1:1998)
Dieser Teil von ISO 15212 legt meßtechnische und andere Anforderungen an Dichtemeßgeräte nach dem Schwingerprinzip fest, die in Laboratorien für alle Arten von homogenen fluiden Proben angewendet werden. Zusätzlich wird eine Methode zur Justierung und Kalibrierung der Laborgeräte beschrieben. Die Geräte können zur alleinigen Dichtemessung dienen oder Teil einer komplexeren Meßeinrichtung sein, welche die Bestimmung weiterer Meßgrößen in der Probe ermöglicht.
Densimètres à oscillations - Partie 1: Instruments de laboratoire (ISO 15212-1:1998)
La présente partie de l'ISO 15212 spécifie les exigences de métrologie et autres applicables aux densimètres à oscillations utilisés dans les laboratoires pour tous les types d'échantillons de fluides homogènes. En outre, elle présente une méthode d'ajustage et d'étalonnage des instruments de laboratoire. Ces instruments sont des éléments isolés ou font partie d'un équipement de mesure complexe fournissant d'autres paramètres d'essai sur l'échantillon. La présente partie de l'ISO 15212 ne décrit pas la méthode d'utilisation des densimètres dans le cas d'applications ou de produits particuliers, tels que les produits pétroliers ou les boissons; de telles méthodes d'utilisation peuvent être définies par des organismes tels que l'ISO ou des agences gouvernementales compétentes. La présente partie de l'ISO 15212 ne définit pas la spécification d'un instrument pour une application particulière quelconque. Pour obtenir ces informations, il convient de se référer à la norme traitant de la méthode d'utilisation. La présente partie de l'ISO 15212 est destinée aux fabricants de densimètres et aux organismes procédant aux essais et à la certification de conformité des densimètres. En outre, cette partie de l'ISO 15212 présente des recommandations pour l'ajustage et l'étalonnage des densimètres par l'utilisateur.
Denzimetri - oscilacijski tip - 1. del: Laboratorijski instrumenti (ISO 15212-1:1998)
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
01-junij-2000
Denzimetri - oscilacijski tip - 1. del: Laboratorijski instrumenti (ISO 15212-1:1998)
Oscillation-type density meters - Part 1: Laboratory instruments (ISO 15212-1:1998)
Dichtemeßgeräte nach dem Schwingerprinzip - Teil 1: Laborgeräte (ISO 15212-1:1998)
Densimetres a oscillations - Partie 1: Instruments de laboratoire (ISO 15212-1:1998)
Ta slovenski standard je istoveten z: EN ISO 15212-1:1999
ICS:
17.060 Merjenje prostornine, mase, Measurement of volume,
gostote, viskoznosti mass, density, viscosity
71.040.20 Laboratorijska posoda in Laboratory ware and related
aparati apparatus
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
INTERNATIONAL ISO
STANDARD 15212-1
First edition
1998-10-01
Oscillation-type density meters —
Part 1:
Laboratory instruments
Densimètres à oscillations —
Partie 1: Instruments de laboratoire
A
Reference number
ISO 15212-1:1998(E)
ISO 15212-1:1998(E)
Contents Page
1 Scope .1
2 Normative references .1
3 Definitions .2
4 Principle and functional units .2
4.1 Measuring principle.2
4.2 Functional units .2
5 Density sensor .3
5.1 Sensor material.3
5.2 Sensor design .3
6 Requirements and tests .4
6.1 Oscillation system .4
6.2 Temperature control and measurement.5
6.3 Displays .7
6.4 Auxiliary units and data transfer.7
6.5 Safety requirements .8
6.6 Electromagnetic compatibility.8
7 Adjustment .8
8 Calibration .8
8.1 Density reference liquids .8
8.2 Particular density reference liquids.9
8.3 Calibration requirements .9
8.4 Calibration procedure.9
© ISO 1998
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic
or mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case postale 56 • CH-1211 Genève 20 • Switzerland
Internet iso@iso.ch
Printed in Switzerland
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ISO ISO 15212-1:1998(E)
9 Density meter accuracy . 10
10 Manual . 10
11 Marking . 11
Annex A (normative) Density and compressibility of pure water . 12
Annex B (normative) Density of moist air . 17
Annex C (informative) Bibliography . 20
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ISO 15212-1:1998(E) ISO
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO
member bodies). The work of preparing International Standards is normally carried out through ISO technical
committees. Each member body interested in a subject for which a technical committee has been established has
the right to be represented on that committee. International organizations, governmental and non-governmental, in
liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical
Commission (IEC) on all matters of electrotechnical standardization.
Draft International Standards adopted by the technical committees are circulated to the member bodies for voting.
Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.
International Standard ISO 15212-1 was prepared by Technical Committee ISO/TC 48, Laboratory glassware and
related apparatus, Subcommittee SC 4, Density measuring instruments.
ISO 15212 consists of the following parts, under the general title Oscillation-type density meters:
Part 1: Laboratory instruments
Part 2: Process instruments for liquids
Annexes A and B form an integral part of this part of ISO 15212. Annex C is for information only.
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INTERNATIONAL STANDARD ISO ISO 15212-1:1998(E)
Oscillation-type density meters —
Part 1:
Laboratory instruments
1 Scope
This part of ISO 15212 specifies metrological and other requirements for oscillation-type density meters which are used
in laboratories for all kinds of homogeneous fluid samples. In addition, a method for adjustment and calibration of
laboratory instruments is given. The instruments are either stand-alone units or part of more complex measuring
equipment supplying additional test parameters of the sample.
This part of ISO 15212 does not describe the method of use of density meters for particular applications or products
such as petroleum products or beverages. Such methods of use can be defined by relevant institutions such as ISO or
responsible government agencies.
This part of ISO 15212 does not define an instrument specification for any particular application. For this information
reference should be made to the relevant standard covering the method of use.
This part of ISO 15212 is addressed to manufacturers of density meters and to bodies testing and certifying the
conformity of density meters. In addition, this part of ISO 15212 gives recommendations for adjustment and calibration
of density meters by the user.
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this part of
ISO 15212. At the time of publication, the editions indicated were valid. All standards are subject to revision, and
parties to agreements based on this part of ISO 15212 are encouraged to investigate the possibility of applying the
most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid
International Standards.
ISO 3585:1998, Borosilicate glass 3.3 — Properties.
ISO 3696:1987, Water for analytical laboratory use — Specification and test methods.
IEC 61010-1:1990, Safety requirements for electrical equipment for measurement, control and laboratory use — Part 1:
General requirements.
IEC 61326-1:1997, Electrical equipment for measurement, control and laboratory use — EMC requirements — Part 1:
General requirements.
1)
IEC 61326-1:— , Amendment 1.
1) To be published.
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ISO
ISO 15212-1:1998(E)
3 Definitions
For the purposes of this part of ISO 15212, the following definitions apply.
NOTE The definitions and terms used are in agreement with the "International Vocabulary of Basic and General Terms in
Metrology".
3.1
adjustment (of a density meter)
operation of bringing the instrument to a state of performance suitable for its use, by setting or adjusting the density
instrument constants
NOTE By adjustment, systematic measuring deviations are removed to an extent which is necessary for the provided
application. Adjustment demands an intervention which permanently modifies the instrument.
3.2
calibration (of a density meter)
set of operations that establishes the relationship between the reference density of standards and the
corresponding density reading of the instrument
NOTE By calibration, no intervention is made which permanently modifies, for example, the instrument constants set
during the adjustment procedure.
3.3
parasitic resonant points (of a density meter)
those oscillation frequencies at which the natural frequency of the density sensor is affected by oscillations of the
"counter mass", comprising the rest of the instrument
4 Principle and functional units
4.1 Measuring principle
The sensors used in density meters are electrically or mechanically induced oscillating systems, whose oscillation
frequencies or periods are a function of the sample density. Depending on the sensor design, the sensor can either
contain the fluid sample or be immersed in it. Instrument constants of the adjusted density meter are used to calculate
the sample density from the oscillation frequency or oscillation period.
4.2 Functional units
Oscillation-type density meters shall consist of the following functional units:
a) a density sensor capable of either being filled with the sample or of being immersed in it;
b) a device to excite and control sensor oscillation;
c) a device to determine and display the density and the oscillation frequency or period;
d) a device to determine and display the sample temperature for which the measured density is valid;
e) a system to detect and display malfunctions and operator errors.
The functional units a) to c) are designated as the oscillation system. In addition, oscillation-type density meters can
incorporate the following functional units:
f) a unit for controlling the temperature of the sample and density sensor;
g) sampling devices;
h) sensor cleaning devices.
All functional units a) to h) can be integrated into a single instrument or can be separate units.
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ISO
ISO 15212-1:1998(E)
Key
A Density sensor (4.2a) D Temperature measurement (4.2d)
B Excitation transmitter (4.2b) E Functional monitoring (4.2e)
C Signal evaluation (4.2c)
Figure 1 — Functional units of a density meter
5 Density sensor
5.1 Sensor material
Density sensor materials can be, for example, borosilicate glass 3.3 in accordance with ISO 3585, metal, metal alloys
or plastics. The material is considered to be suitable if it shows in resistance tables the highest class of resistance
against the samples to be measured and the cleaning agents to be used in the density meter. Erosion as well as
special forms of corrosion shall be considered in this respect. Where there is no literature or practical data available,
the resistance of the sensor material should be tested as follows.
a) Weigh a clean and dry test piece identical to the sensor material. The maximum permissible error of the
balance shall not exceed 0,01 % of the test-piece mass.
b) Immerse the test piece in the fluid to be measured with the sensor, under the intended measuring conditions,
e.g. temperature and pressure.
c) After 12 h remove, clean, dry and weigh the test piece.
The sensor material is considered to be resistant if the mass of the test piece is changed by the test procedure by
less than + 0,05 %.
5.2 Sensor design
Density sensors can be designed as straight, U-formed or omega-formed tubes. Other designs are tuning-forks,
cylinders, bells or membranes. All designs which conform to the functional principle in accordance with 4.1 can be
constructed.
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