Air Blower
for CD 3002
Yo ur
eye
in
hell
© Siemens Laser Analytics AB Jan 2001
CD 3002 Air blower manual
Document number: CID 3002-1110 Rev. 1A
LDS 3000 Air blower Content
Content
1. Purging of CD 3002 using air blower 1
1.1 General 1
1.2 Installation 1
1.3 Maintanance 4
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Content LDS 3000 Air blower
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LDS 3000 Air blower Purging of CD 3002 using air blower
1. Purging of CD 3002 using air blower
1.1 General
In application with high dust load and ash build-up in front of the lens in
CD 3002 very high purging flows may be necessary. For these applications an air blower producing flow rates in the 1000 ltr/min. range can be
used. A typical application where this is preferable is in MWI (municipal
waste incineration). This manual relates to the installation and operation
of the air blower set supplied by Siemens Laser Analytics.
1.2 Installation
An important issue is the counter pressure build up at the output of the
air blower. It is vital to keep this as low as possible since the air flow is
decreasing when the counter pressure increases – se the graph below.
Flow rate vs counter pressure
200
160
120
80
40
Counter pressure [mbar]
0
0 200 400 600 800 1000
Flow rate [ltr/min]
Flow rate vs counter pressure.
A large cross section of the air blower output and a short tube is parameters that affects this in a positive direction. If a long tube must be used
– make sure it has a large diameter. The following diagram illustrates the
flow changes with different output tubes and may serve as a guide when
the set-up is designed. If the air blower is serving two sensors it is very
important that the lengths of the tubes to the two sensors are equal. This
ensures that the air is split 50/50 between the two.
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Purging of CD 3002 using air blower LDS 3000 Air blower
1000
Air flow [ltr/min]
100
110
Length of tube [m]
Flow rate vs length of the tube between the air blower and the sensor.
Mechanical
The air blower should be monted close to the sensor using bolts of the dimension M10 on the following positions
226 mm
220 mm
Position of mounting holes.
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LDS 3000 Air blower Purging of CD 3002 using air blower
The position of the air blower should either be horizontal with the mounting plate facing downwards or vertical with the air exit facing upwards.
The figure below shows a good way of setting up the sensor with an air
blower.
Output air tube
Air blower
Input air filter
Example set-up of CD 3002 with air blower.
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Purging of CD 3002 using air blower LDS 3000 Air blower
1.3 Maintanance
The major maintanance on the air blower is to change the input filter at
a regular interval. The time between changes is totally dependent on the
environment in which the air blower operates. The inlet under-pressure
(directly after the filter) will reveal the condition of the filter and can be
used to monitor this. Siemens Laser Analytics can provide suitable
equippment for this.
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