The “Dusty” uses the electrodynamic principle. This means that as soon as moving, electrically charged dust particles impact the sensor or fly past it, an electric charge transfer of the particles to the sensor rodtakes place. These very small signals are reinforced in the electronics and thus made visible.
The Dusty is a compact device that operates on 24 V DC supply voltage. The device is delivered pre-calibrated. The switching point is set to approx. 25 mg/m3_ dust (reference material) and can be individually adjusted to the respective application by the operator. * The switching points can be corrected up or down manually by the user in 5 mg increments, depending on the requirements for the application.
If the user experiences difficulties with the pre-calibration, it is possible to carry out an auto-setup. During the auto-setup, the actual dust volume in the clean gas is determined and can be saved as a reference value (normal). In principle, the “Dusty” can detect all types of dust. Any coating on the sensor rod has no influence on the function of the device. The solid stainless steel sensor rod has a standard length of 190 mm and in case of small channel diameters can be reduced to the required length as desired.
If desired, the Dusty can be combined with a converter. This converter converts the measuring signal into a continuous 4… 20 mA signal and outputs this. This trend signal makes it possible for the user to represent the dust load on the clean gas side. In case of a large channel diameter, up to 3 sensors can be connected to one converter to improve the trend signal. * (The pre-calibration takes place at SWR’s own test facility with organic dust under the following conditions: Channel diameter = 250 mm; air flow speed 14 m/s; temperature 25 °C)