Advantages
of a semiconductor laser:
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.
Due to the high
intensity of the laser the device 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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FEATURES
AND BENEFITS
- 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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