Comde-Derenda GmbH

Automatic Sampling System PNS DM

Design Before operations commences, the electrical and pneumatic connections are made between low/medium volume sampler and automatic filter changer. The LVS (Low Volume Sampler) and MVS (Medium Volume Sampler) consist essentially of a control unit (with electronic modules, SD card reader, and interfaces), vacuum pump, orifice plate and temperature and humidity sensors, contained in or attached to a stainless steel cabinet. The LVS 3.1 is equipped with a 4 m³/h rotary vane vacuum pump. The volumetric flow rate for sampling PM10 or PM2.5 fractions is 2.3 m³/h; the maximum vacuum at the filter is 300 mbar. The maximum volumetric flow rate when using glass fiber filters is 3.5 m³/h. The MVS 6.1 is equipped with a 8 m³/h rotary vane vacuum pump. It can be operated with a maximum volumetric flow rate of approx. 5.5 m³/h. It is especially suitable for measuring semi-volatile organic compounds (SVOCs), and for use in conjunction with special filter materials (e.g. cellulose nitrate or Nuclepore filters). The maximum vacuum at the filter is 500 mbar. LVS and MVS function according to European directive EN 12341:2014. The automatic filter changer consists of a filter changer unit with filter magazine mounting positions, filter magazines (capacity 18 or 24 filters) and aluminum intake tube (anodized, Ø 40 mm, length 800 mm, custom lengths available) in a stainless steel housing. A sampling inlet for fractions PM10, PM2.5, PM1 or TSP and a Peltier cooling unit are optionally available. The filter changer cabinet is vented in order to prevent moisture condensation and icing. The connection between the sampling inlet and intake tube is gas-tight. Three magazines and 36 resp. 48 filter cartridges come with each unit. When magazines are changed, one filter cartridge remains in the sampling position. The magazines also serve as portable containers.