The dust channel
Photo: , Foto: M. Ulbrich
Since 1998 the Dr. Födisch Umweltmesstechnik AG has been operating a laboratory with a dust channel offering the possibility to produce dust contents within the range of 1...10.000 mg/m³ and gas rates of 1...45 m/s. Therefore this facility is perfectly suited to simulate the most diverse operational states so that influencing factors on measuring principles and devices (especially in the field of dust measuring technology) can be investigated as well as own devices can be precalibrated at factory before delivery.
The dust channel contains four flow channels, where defined dust can be brought into in dispersed form. The system Photo: , Foto: M. Ulbrich operates in suction mode. A flow rate of up to 22.000 m³/h is sucked in alternating way over the round flow channels with diameters of 200 mm, 400 mm or 560 mm or over a rectangular flow channel with the dimensions of 400 mm x 560 mm. The speed control of the fan is done by means of a frequency changer. For the production of defined dust concentrations the dosage of the solid dusts is done by means of a particle dosing and disperging device. The dust-loaded gas flow is cleaned by a cartridge filter and blown back into the hall.
Photo: , Foto: M. Ulbrich As reference measuring instruments a scattered light photometer KTN (manufacturer SIGRIST) as well as the triboelectric dust measuring instruments PFM 97 and PFM 92 are available. We work with 2 test dusts: Micro - Calcilin (grain size: x50 = 3,5 µm) and slate powder (grain size: x50 = 7,0 µm). The exact dust concentration results from the quantity given per time unit / flow rate or, if required, from gravimetric measurements.
The calibration gas facilities
Photo: , Foto: S. Wild Starting the development of own gas analysers, of course, new laboratory facilities had to be built. Several calibration work-stations as well as a calibration cabinet were constructed serving mainly the test of the devices in order to automate workflows and minimise time efforts as far as possible. Thus it is possible to calibrate simultaneously several analysers of the MCA 04-series. The cabinet holds max. 5 analysers of the MGA 09-series. Their calibration takes place at the same time, too.
The energy centre
"Last but not least" - the captive energy centre includes a little power plant among other things which allows to test and run diverse measuring devices under raw and clean gas conditions being as close to practice as possible.