Particle measuring devices

Sustainable protection of the environment relies on the detection and accurate measurement of dust and particle emissions. This is because dust particles, especially from industrial plants, have a significant impact on people and natural areas. The monitoring of particles in room air is also becoming increasingly important. With its comprehensive product portfolio for small to large measuring ranges and gas duct diameters, we offer suitable solutions even for difficult measuring tasks, such as dust measurement in wet gases. Of course, suitability-tested devices and those with automatic testing of zero and reference point are also available. In some devices, features such as contamination monitoring or automatic self-alignment can be selected, which round out the outstanding features of our dust measuring devices.

Measurement of dust

Depending on the boundary conditions, scattered light or transmittance measurement can be more suitable for detecting dust concentrations. With the transmittance measurement principle, the measurement is based on the attenuation of a light beam by the light absorption of the particles. With the scattered light measurement principle, there are two options to choose from: With backward scattering, the light reflected from the particles is measured. In forward scattering, the radiation scattered by refraction or diffraction in the forward direction of the incident light serves as the measurand. We offer all of these measurement principles in its dust measuring devices in order to be able to optimally satisfy the different requirements of measuring tasks.

Scattered light measurement: The right choice for small concentration of dust

In scattered light measurement, the radiated light is scattered by the particles in the gas mixture and detected by a sensitive receiver. Due to its high sensitivity, the scattered light principle is especially suitable for low dust concentrations, even below 1 mg/m³. Depending on the system-specific requirements and particle properties, either forward or backward scattering can be used. Both measurement principles return stable and repeatable measurement results, regardless of the gas velocity, humidity, or dust particle charges. As an experienced manufacturer of dust measuring devices, we supply measuring devices with both forward and backward scattering.

Transmittance measurement technology: measurement at high dust concentration and inhomogeneous media

Transmittance measurement technology detects light attenuation by dust particles. Transmittance dust measuring devices are well suited for medium to high dust concentrations and large gas duct diameters. Fields of application are emission and process monitoring as well as room air monitoring. The measuring devices measure over the entire gas duct diameter, which partially compensates for inhomogeneities in the particle distribution. This leads to a very representative measurement result. The devices do not protrude into the gas duct and thus have no direct contact with aggressive process gases. An optional contamination correction function compensates for the gradual soiling of the optical faces. The measurement results can be output as dust concentration or in transmittance, absorbance and opacity.