Mitsubishi Electric Lossnay LGH-F1200RX5-E, Technical Manual

Page: 87 / 105

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