MP Filtri ICM, User Manual

Page: 75 / 82

Appendix G
New ISO Medium Test Dust and its effect on ISO . . . 75
New Test Dust Benefits
The new ISO Medium Test Dust (ISO MTD) consists of similar materials to the old
ACFTD, but to minimize particle counting errors, it is of a slightly coarser grade be-
cause ACFTD included too many particles smaller than 5µm which gave problems
during testing.
ISO MTD is produced to a standard distribution and stringent quality control pro-
cedures, thereby ensuring excellent batch-to-batch repeatability. These procedures,
combined with a revised ISO APC calibration method give:
•
A traceable and controlled reference test dust with greatly reduced variation in par-
ticle size distribution. This gives the trace-ability required by ISO 9000, QS9000
and similar quality management systems.
•
A procedure for determining the performance of APCs so that minimum acceptable
levels can be set by the user.
•
Improved calibration techniques and procedures.
•
More accurate calibration.
•
Improved levels of particle count reproducibility with different equipment.
•
More accurate and consistent filter test results.
Effect on Industry
The introduction of ISO MTD has necessitated changes to certain ISO standards.
The standards affected include:
ISO 4402:1991 Hydraulic fluid power
Calibration of liquid automatic particle counters.
ISO 4406:1987 Hydraulic fluid power
Code for defining the level of contamination by solid particles.
ISO 4572:1981 Hydraulic fluid power – Filters
Multi-pass method for evaluating filtration performance of a filter
element.