Mitsubishi Electric Lossnay LGH-F1200RX5-E, Technical Manual

Page: 88 / 105

U-79
CHAPTER 8
•
Filters
Gravitational Method
This method is used for air filters that remove coarse dust (0.39 mil (10 µm) or more). The measurement method is determined
by the gravitational ratio of the dust amount on the in-flow and out-flow sides.
Dust collection ratio =
In-flow side dust amount – Out-flow side dust amount
×
100 (%)
In-flow side dust amount
Colorimetric Method
The in-flow side air and out-flow side air are sampled using a suction pump and passed though filtering paper. The sampled
air is adjusted so that the degree of contamination on both filter papers is the same, and the results are determined by the
sampled air volume ratios on both sides.
Dust collection ratio =
Out-flow side sampling amount – In-flow side sampling amount
×
100 (%)
Out-flow side sampling amount
Orifice
Dust supply
device
Manometer
Motor
Dust container
Mixing blades
Dust supply outlet
Unit (inch(mm))
Rectifying grid
Air volume
adjustment plate
Air-feed fan
Window
Specimen
Performance test device Example of dust supply device
Dust collection filter
Air-feed fan
Orifice
Square duct
Throttle device
Rectifying grid
Venturi pipe
Dust chamber
Air filter
Specimen
3.5D 3D 2D 2L 2L
Baffle plate
Coupling pipe
7° or
less
Pressure loss concentration
measurement position
Coupling pipe Rectifying grid
Coupling
pipe
Round duct
7.9(200)
21.7(500)
10.5R
(267R)
3.9R
(100R)