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LM 3188 is
the most cost-effective dust monitor model, equipped with a
semiconductor laser. It is excellent for measuring at the medium
to long distances ( 3 - 10 m) and medium high concentrations.
( > 25 mg/m3).
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The system setup:
- The
transmitter unit L 318
- The
receiver unit R 318
- The
monitor unit M 318
- Purge
air unit or the external instrument air source
- Optional
data logging software available
Features:
- Direct
continuous measurement of opacity or optical density
- Small,
lightweight and easy installation
- No
moving parts and simple optics for long life operation
- Light
source is a semiconductor laser
- Adjustable
alarm values and alarm relay
- Linear
voltage output 0...1V and current output 4 ... 20mA
- 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)
- Low
maintenance requirements and small physical size due to
simple optics
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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 hole, about
20mm, are needed in the stack simplifying the installation
and requiring less purge air for the transmitter.
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 it can easily penetrate
also 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 and whose spectrum changes with age.
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Typical applications:
Continuous particle emission control in
applications, where the measuring path is max 40 meters
Max. Dust content 2g/m3
This model is most commonly used in power
plants burning oil, coal or bio-fuel, in cement plants or
in steel or iron furnaces
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