Comparing Dust Collection Efficiency Measurement Methods - Mitsubishi Electric Lossnay series Technical Manual

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CHAPTER 8 Filters
4. Comparing Dust Collection Efficiency Measurement
Methods
The gravitational, colorimetric, and counting methods used for measuring dust collection efficiency each have different features
and must be used according to filter application.
Test Method Test Dust
Synthetic:
AFI • Dust on standard
Gravitational road in Arizona: 72%
method • K-1 carbon black: 25%
• No. 7 cotton lint: 3%
NBS
Colorimetric Atmospheric dust
method
DOP Diameter of dioctyl-
Counting phthalate small drop
method particles: 0.01mil (0.3 µm)
Synthetic:
ASHRAE • Regulated air cleaner
Gravitational fine particles: 72%
method • Morocco Black: 23%
• Cotton linter: 5%
ASHRAE
Colorimetric Atmospheric dust
method
Air filter test for air
conditioning set by
Japan Air Cleaning JIS 11-type dust
Assoc.
(Colorimetric test)
Pre-filter test set
by Japan Air
Cleaning Assoc. JIS 8-type dust
(Gravitational
test)
Electrostatic air
cleaning device test
set by Japan Air JIS 11-type dust
Cleaning Assoc.
(Colorimetric test)
U-78
Inward Flow Dust Outward Flow Dust
Measurement Method Measurement Method
• Filter passage air
Dust weight volume measured
measured • Weigh the dust
beforehand remaining on the
filter and compare
Degree of Degree of
contamination of contamination of
white filter paper white filter paper
Electrical counting
measurement using Same as left
light aimed at DOP
• Filter passage air
Dust weight volume measured
measured • Weigh the dust
beforehand remaining on the
filter and compare
Degree of Degree of
contamination of contamination of
white filter paper white filter paper
Degree of Degree of
contamination of contamination of
white filter paper white filter paper
• Filter passage air
Dust weight volume measured
measured • Weigh the dust
beforehand. remaining on the
filter and compare.
Degree of Degree of
contamination of contamination of
white filter paper white filter paper
Efficiency Type of Applicable
Indication Method
Gravitational ratio Synthetic dust filters
Comparison of
Electrostatic dust
contamination of
percentage of
reduction in degree
(for air conditioning)
of contamination
Absolute filter and
Counting ratio same type of high
efficiency filter
Pre-filter
Filter for air
Gravitational ratio
conditioning
(for coarse dust)
Comparison of Filter for air
percentage of conditioning (for fine
reduction in degree dust) Electrostatic
of contamination dust collector
Comparison of
percentage of Filter for air
reduction in degree conditioning
of contamination
Gravitational ratio Pre-filter
Comparison of
percentage of Electrostatic dust
reduction in degree collector
of contamination
Filters