Environmental Monitoring Systems Comde-Derenda GmbH Kieler Strasse 9, 14532 Stahnsdorf / Germany [email protected] www.comde-derenda.de

COMDE DERENDA Automatic weighing system (AWS) for weighing dust-laden filters with a diameter of 47 mm for registration and documentation of particulate matter (Pat. pend.) Type: AWS-1 The automatic weight determination system (AWS) registers and documents the amount of particulate matter in outdoor air in compliance with the EN 12341:2014 (PM10and PM2,5) standards. The particulate matter is collected on filter media with a filter diameter of 47 mm mounted in volume samplers in combination with specimen sampling systems. Very exact, automatic weight determination system for filters with a diameter...

Environmental Monitoring Systems Introduction of the automatic weighing system Filter disk magazine Several European Union directives require that the particulate matter present in outside air be measured. In most cases reference units (low-volume samplers) are used for this purpose. A vacuum pump is used to draw particulate-laden air into the device, the particulates are sorted by size in separation stages (impactors) and the dust particles thus recovered are deposited on a filter. In the past, the amount of dust thus collected was ascertained by manual weighing at an outside laboratory. Where...

Environmental Monitoring Systems Reader station to identify filters As has already been mentioned, one prerequisite for automating the weighing process is the requirement to mark and identify the filters. Where the filters are 47 mm in diameter and the exposure area is 41 mm in diameter, an annular area 3 mm wide will be available for marking. A digitally controlled cutting device, not a part of the weighing system, is used to place a binary code on the edge of the filter. Each marking is about 2 x 1.75 mm in size. The programming for these codes is handled by the control and data recording PC,...

Environmental Monitoring Systems The magazine in a specimen sampling system is fitted with 16 filter cassettes containing filters; one of these filters is a so-called „blank filter“ (reference filter). It is used to determine the passive accumulation of dust in the specimen sampling system’s changing unit. Once the magazine disks in the automatic weight determination system have been fitted with filters taken from the cassettes in the specimen sampling system, the reference filter will be weighed before the start of each weighing cycling to determine the potential need for corrective measures....

COMDE DERENDA Comde-Derenda GmbH Kieler Strasse 9, 14532 Stahnsdorf / Germany [email protected] www.comde-derenda.de

COMDE DERENDA Technical Data Automatic Weighing System Type AWS - 1 Filter disc magazine Number of magazine discs holding filters: Number of filters / magazine disc: Material of magazine discs: Potential equalization: Drive system of the disc magazine: Positioning of the disc magazine: Filter Filter material: 10 or 20 16 2.4 mm fiberglass reinforced epoxy resin, gold plated By means of cone contacts between the gold plated magazine discs Brushless DC motor By means of incremental encoder Filter diameter: Filter marking: Position of marking: Dimension of marking: Type of marking: Reader station: Microbalance...

Environmental Monitoring Systems Comde-Derenda GmbH in Stahnsdorf bei Berlin Comde-Derenda GmbH was originally founded as an engineering office in Berlin, in the year 1972. The company’s activities at that time included the development, production and sales of measurement and control systems and gas analysis systems. Over the course of time the engineering office focused on the development and production of devices and systems for the collection of particulates in the ambient air, used in the field of environmental protection. COMDE GmbH was founded in the year 1992. The company in particular...