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Chapter 1
Chapter 1
Getting Started
Getting Started
Product Overview
Product Overview
The LASAIR II is an airborne-particle counter designed for either mobile or
The LASAIR II is an airborne-particle counter designed for either mobile or
dedicated use. The sizing channel
dedicated use. The sizing channel threshold and the sample flow rate vary with
threshold and the sample flow rate vary with
the particular model. See the cha
the particular model. See the chart below for each model’s channel thresholds
rt below for each model’s channel thresholds
and flow rates.
and flow rates.
Counting
Counting T
Technique
echnique
When the LASAIR II begins sampling, the internal pump
When the LASAIR II begins sampling, the internal pump creates a vacuum to
creates a vacuum to
pull air into
pull air into the sample inlet.
the sample inlet. The sample fl
The sample flow is controlled
ow is controlled to maintain 1
to maintain 1 CFM
CFM
(50 LPM for the 350L and 55
(50 LPM for the 350L and 550L) of airflow through the sampler. A variance of
0L) of airflow through the sampler. A variance of
only +5% in airflow is allowed in a valid sample.
only +5% in airflow is allowed in a valid sample.
Air moves from the sample inlet through the sample ch
Air moves from the sample inlet through the sample chamber. A laser beam is
amber. A laser beam is
projected through the sample chamber so that any particles in the sample will
projected through the sample chamber so that any particles in the sample will
scatter the light. The scattered light en
scatter the light. The scattered light energy is picked up by the
ergy is picked up by the collecting optics
collecting optics
and converted to a voltage pulse with the amplitude of the voltage pulse
and converted to a voltage pulse with the amplitude of the voltage pulse
corresponding to the size of the particle.
corresponding to the size of the particle.
The incoming particle data is allocated according to size to the appropriate
The incoming particle data is allocated according to size to the appropriate
channel. Both differential and cumulative counts are displayed.
channel. Both differential and cumulative counts are displayed.
M
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5,
, 1
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10
0..0
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25
5..0
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µ
µ
m
m
1
1..7
77
7 ccffm
m ((5
50
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LP
PM
M))
Y
Yeess
5
55
50
0L
L
0
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5,
, 1
1..0
0,
, 2
2..0
0,
, 5
5..0
0,
, 1
10
0..0
0,
, 2
25
5..0
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µ
µ
m
m
1
1..7
77
7 ccffm
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0 L
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PM
M))
Y
Yeess
3
31
10
0A
A
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0..3
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, 0
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5,
, 1
1..0
0,
, 5
5..0
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10
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, 2
25
5..0
0
µ
µ
m
m
1
1..0
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m ((2
28
8..3
3 L
LP
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Y
Yeess
3
31
10
0B
B
0
0..3
3,
, 0
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5,
, 1
1..0
0,
, 3
3..0
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5..0
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10
0..0
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µ
µ
m
m
1
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Y
Yeess
5
51
10
0A
A
0
0..5
5,
, 1
1..0
0,
, 2
2..0
0,
, 5
5..0
0,
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10
0..0
0,
, 2
25
5..0
0
µ
µ
m
m
1
1..0
0 ccffm
m ((2
28
8..3
3 L
LP
PM
M))
Y
Yeess
3
31
10
0
0
0..3
3,
, 0
0..5
5,
, 0
0..7
7,
, 1
1..0
0,
, 5
5..0
0,
, 1
10
0..0
0
µ
µ
m
m
1
1..0
0 ccffm
m ((2
28
8..3
3 L
LP
PM
M))
N
No
o
3
32
25
5
0
0..3
3,
, 0
0..5
5,
, 1
1..0
0,
, 5
5..0
0,
, 1
10
0..0
0,
, 2
25
5..0
0
µ
µ
m
m
1
1..0
0 ccffm
m ((2
28
8..3
3 L
LP
PM
M))
N
No
o
5
51
10
0
0
0..5
5,
, 0
0..7
7,
, 1
1..0
0,
, 2
2..0
0,
, 5
5..0
0,
, 1
10
0..0
0
µ
µ
m
m
1
1..0
0 ccffm
m ((2
28
8..3
3 L
LP
PM
M))
N
No
o
5
52
25
5
0
0..5
5,
, 0
0..7
7,
, 1
1..0
0,
, 5
5..0
0,
, 1
10
0..0
0,
, 2
25
5..0
0
µ
µ
m
m
1
1..0
0 ccffm
m ((2
28
8..3
3 L
LP
PM
M))
N
No
o
