ISO 1607-2:1978

INTERNATIONAL STANDARD 1607/ll
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION.MEXAYHAPOI1HAR OPrAHH3AUHR il0 CTAHnAPTH3AUHH.ORGANlSATlON INTERNATIONALE DE NORMALISATION
Positive-displacement vacuum pumps - Measurement of
e
performance characteristics -
Part II : Measurement of ultimate pressure
Pompes primaires volumétriques à vide - Mesurage des caractéristiques fonctionnelles -
Partie Il : Mesurage de la pression limite
First edition - 1978-09-01
UDC 621.522 : 531.788 Ref. No. IS0 1607/11-1978 (E)
Descriptors : vacuum apparatus, pumps, vacuum pumps, tests, performance tests, pressure measurement.
Price based on 3 pages

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FOREWORD
IS0 (the International Organization for Standardization) is a worldwide federation
of national standards institutes (IS0 member bodies). The work of developing
International Standards is carried out through IS0 technical committees. Every
member body interested in a subject for which a technical committee has been set
up 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.
Draft International Standards adopted by the technical committees are circulated
to the member bodies for approval before their acceptance as International
Standards by the IS0 Council.
International Standard IS0 1607/l I was developed by Technical Committee
ISO/TC 112, Vacuum technology, and was circulated to the member bodies in
June 1977.
It has been approved by the member bodies of the following countries :
Australia Germany Romania
Austria India South Africa, Rep. of
Belgium Italy Spain
Chile Korea, Rep. of Turkey
Czechoslovakia Mexico United Kingdom
Egypt, Ardb Rep. of Netherlands U.S.A.
France Philippines Yugoslavia
No member body expressed disapproval of the document.
cri International Organization for Standardization, 1978
Piinted in Switzerland

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INTERNATIONAL STANDARD IS0 1607/11-1978 (E)
Positive-displacement vacuum pumps - Measurement of
performance characteristics -
Part II : Measurement of ultimate pressure
O INTRODUCTION 2.2 test dome; test header : A chamber of specified form
and dimensions attached to the inlet of the pump through
The purpose of this International Standard is to ensure that
which a measured flow of gas may be admitted to the
measurements of the performance characteristics of positive-
pump, and which is equipped with means of pressure
displacement vacuum pumps are, as far as possible, carried
measu rement.
out by uniform procedures and under uniform conditions.
It is hoped that, as a result, measurements conducted by
L.
different manufacturers or in different laboratories, and
3 APPARATUS
statements of performance quoted in manufacturers'
3.1 Test dome, cylindrical and of the form shown in the
literature, will be on a properly comparable basis to the
figure. The axial dimension of the dome is 1,5 D, where D
benefit of both user and manufacturer.
is the internal diameter, and the test gas entrance is on the
It is envisaged that the complete International Standard
axis at a distance D from the connecting flange and so
will, in due course, deal comprehensively with the measure-
arranged that the gas entrance into the dome is in adirection
ment of a wide range of performance characteristics of the
away from the pump mouth. The connection to the
main types of positive-displacement vacuum pumps. In
is at a distance 0,5 D from the
pressure measuring gauge
order, however, that useful agreements of more restricted
its axis perpendicular to that of the
connecting flange with
scope may be implemented with the least possible delay,
dome. The axis of the test dome shall be perpendicular to
it is intended to publish this International Standard in
the plane of the inlet flange of the pump.
parts.
The volume of the test dome (V,) shall be at least five
times the volume swept by the pump during one com-
pression cycle (Vp). The connection to the inlet of the
pump shall consist of an adaptor the length of which shall
not exceed 0,5 D (see the figure). The appropriate dome
1 SCOPE AND FIELD OF APPLICATION
dimensions for pumps of given sizes are indicated in the
following table.
This part of the International Standard specifies methods
of measuring the ultimate pressure of positivedisplacement
vacuum pumps.
V,, litres
V,, litres
The pumps consider
...