IS 13571 : 2025/ISO 11171 : 2022 Hydraulic Fluid Power - Calibration of Automatic Particle Counters for Liquids
Revised Standard from Last Update.
NATIONAL FOREWORD
This Indian Standard (Second Revision) which is identical to ISO 11171 : 2022 'Hydraulic fluid power - Calibration of automatic particle counters for liquids' issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on the recommendation of the Fluid Power Systems Sectional Committee and approval of the Production and General Engineering Division Council.
This standard was first published in 1992 and subsequently revised in 2020. The revision of this standard has been brought out to align with the latest version of ISO 11171.
The following major modifications have been incorporated to the revision of the standard:
a) In 3.8, particle size distribution, Note 1 to entry has been revised;
b) In 6.12 and D.3, the threshold voltage settings for the second and fourth channels have been revised to 0.56 times and 1.56 times, respectively, of the threshold voltage setting of the third channel;
c) Clause B.8 has been amended to read, 'Calculate the theoretical number concentration of particles for each mass concentration, Xt';
d) In Table B.1, the units for 'Xt (particles/L)' have been corrected to 'Xt (particles/mL)';
e) In D.7, the threshold voltage settings for the first and fifth channels have been revised to 0.56 times and 1.56 times, respectively, of the threshold voltage setting of the third channel.;
f) In G.6, the subscript in the denominator of formula G.3 has been corrected from 'V0' to 'VS'.
The text of ISO standard has been approved as suitable for publication as an Indian Standard without deviations. Certain conventions are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following:
a) Wherever the words 'International Standard' appear referring to this standard, they should be read as 'Indian Standard'; and
b) Comma (,) has been used as a decimal marker while in Indian Standards, the current practice is to use a point (.) as the decimal marker.