It 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). Laser light source-ultimate wavelength stability, Excellent collimation and High sensitivity
- Minimum optics needed – less maintenance
- Optimal for stacks up to 20 meters (with optional 100mm lens up to 40 meters)
- No moving parts-minimal maintenance
- Large operation range ( 0 … 90 %)
- Good stability and reliability
Advantages of using a Laser Light Source
- Measuring path up to 20 meters possible, due to a narrow and intense laser light beam.
- Excellent beam collimation (0,04 °) – no need to use lenses or mirrors in the transmitter making the system reliable and simple
- The analyser can be transferred to another location without factory calibration.
- The alignment of the beam is easy because the beam is narrow.
Advantages of a semiconductor laser
- A very compact and intense light beam, the diameter is only a few millimetres. 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.
Features:
- Based on the single pass measurement principle.
- 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 – 1 V 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
Applications:
- Continuous particle emission control in applications, where the measuring path is max 40 meters / Max. dust content 2 g/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