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Advanced
dust monitor with semiconductor laser.
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The system setup:
- The
transmitter unit L 318
- The
receiver unit R 318
- The
monitor unit M 318
- Cables
between the units
- Purge
air unit or the external instrument air source
- Optional
data logging software available
Features
of LM3188 AZL:
- Direct
continuous measurement of opacity or optical density
- Small,
lightweight and easy installation
- Light
source is a semiconductor laser, the advantages are listed
in the following section
- Manual
and automatic zero and calibration
- Fast
assembly due to simple cabling and small holes required
in the stack
- Adjustable
alarm values and alarm relay
- Linear
voltage output 0-1 V and current output 4 ... 20 mA
- Digital
LCD-display and analogue display for D-value
- 4 operation
ranges (0...0,03 D, 0...0,1 D, 0...0,3 D, 0...1,0 D)
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Advantages
of a semiconductor laser:
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- A very
compact and intense light beam, the diameter is only a few
millimeters. This means that only small holes, 20 - 50 mm,
are needed in the stack simplifying the installation.
- Good
stability and long life. In contrast to designs that use
more traditional light bulbs, needing constant compensation,
the laser source is relatively immune to the aging effect.
The typical life span of a semiconductor laser is up to
10 years.
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- Due
to the high intensity of the laser the device can penetrate
higher dust densities
- Operation
with known, clearly defined wavelengths. This makes the
theoretical calculations and their results more predictable
as opposed to conventional sources that operate over a broad
range of wavelengths & spectrum changes with age.
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Typical applications:
- Continuous
particle emission control in applications where the measuring
path is maximum 40 meters
- Max.
Dust content 2g/m3
- This
model is most commonly used in power plants that burn oil,
coal or bio-fuel, in cement plants or in steel or iron furnaces.
There is
a model LM 3188 AZH available as well which is suitable for
dust contents up to 20g/m3 but otherwise offers the same features
as LM 318
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PDF
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