Wide-range particle

Apparatus for detecting particles in a gas over a wide particle size range, the wide particle size range has an upper limit and a lower limit and an Zwischenteilchengrose between the limits, the apparatus detects a Grobteilchendetektor, the particles in a Grobteilchenbereich between the upper limit and the Zwischenteilchengrose, and has a fine particle, the particles in a Feinteilchenbereich between the Zwischenteilchengrose and the lower limit is detected, the Grobteilchendetektor and the fine particle detector are mounted on a common chassis, wherein the Grobteilchendetektor is an optical particle detector.