APM - 2 Air Pollution Monitor
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Environmental Monitoring SystemsAir pollution measurement unit (online) for determining the concentration of PM10 and PM2.5 Type: APM-2 Air Pollution MonitorThis new measuring instrument, designed to determine the concentration of suspended dust particles, makes use of the light reflected by tiny particulate matter (nephelometer). Our Air Pollution Monitor APM-2 which uses a photometric light scattering measurement technique, has passed the type-approval test of the TUV Rheinland in accordance with the new guideline for the fractions PMio and PM2.5 (EN 12341:2014). The measurement method used in the APM-2 has been confirmed as being equivalent to the previously used gravimetric method according to the guideline: “Demonstration of Equivalence of Ambient Air Monitoring Methods”. The previously identified correction factors/ terms have been taken into account. This was published in the report of: TUV Rheinland Energie und Umwelt GmbH, Koln, Report No. 936/21219977/A of 26. March 2014 ■ Online measurement unit ■ Determines, alternately, the concentrations of PM10 and PM2.5 particulates ■ Simple operation, ■ Quick selection with jog dial ■ Large, backlit display ■ Display of all measurement parameters ■ Data transmission via GPRS modem (optional) ■ Simple software updating using flash RAM ■ Only an annual verification against the reference method is necessary The APM-2 is a measurement instrument used for direct and continuous determination of the concentration of PM 10 and PM2.5 particles suspended in outdoor air. This measurement is made using a photometer, utilizing the principle of light diffusion at tiny particles. The reflected light is registered by a photo detector and is increased with a low-noise amplifier to a level of 0 to 5 V. This output signal is a direct measure of particulate matter concentration. The outdoor air is drawn in via a PM10 sampling head operating with a volumetric flow of 3.3 l/min. Particles greater than 10 |jiti in size will be segregated out inside this sampling head during intake. In its overall structure, this unit corresponds to the certified PM10 head used in the low-volume sampling device as per EN 12341:2014. The low-volume unit is designed for an air intake rate of 3.3 l/min (as compared with 38.3 l/min) and has been tested by the Institut fur Energie und Umwelttechnik IUTA e.V. (Institute for Energy and Environmental Technology) with regard to its segregation characteristics. The outside air thus drawn into the unit is then divided into two sub-streams in a virtual impactor located downstream. A low-loss diverter unit (electromagnetic valve block) determines whether the aerosol from the auxiliary stream (enrichment mode) or from the main stream (normal mode) passes into the reflected light detector. The APM-2 thus determines the PM10 concentration when it is in the enrichment mode; the PM2,5 concentration in the normal mode. The switching unit periodically admits filtered air to the reflected light detector in order to re-zero the instrument. The photometer is installed in a thermally insulated case and kept at a temperature of 40 °C in order to eliminate any thermal effects on the photometer signal. The data generated by the unit are stored internally on an SD card. Additionally, it is possible to transmit the data to a network computer using an integrated GPRS modem (optional). Page 1/2 Comde-Derenda GmbH Kieler Strasse 9, 14532 Stahnsdorf / Germany info@comde-derenda.de www.comde-derenda.de

COMDE DERENDA Measurement procedure used in the Air Pollution Monitor Type APM-2 The heart of the procedure for online measurement of environmental aerosols is a highly sensitive reflected light detector. The light emitted at stabilized intensity by a laser diode illuminates a measurement space defined by the beam path. The light scattered by all the particulates inside this measurement space is sensed at a 90° angle by a semiconductor photo detector. The signal is made available, following amplification, as a voltage signal (0 to 5 V). This signal is directly proportional to the mass...