Kobold DOG-4, Operating Instructions Manual

Page: 9 / 44

DOG-4
DOG-4 K08/0818 page 9
6. Operating Principle
This device is a oscillating beam device and works without any movable parts. An
orifice plate in the base creates flow resistance, which forces a partial flow to be
directed into the measurement head. The gas in the measuring head begins to
oscillate. The frequency of oscillation is proportional to the flow of volume. As the
ratio between the flow through the measuring head and the flow through the
measuring housing is constant, the frequency of oscillation is directly proportional to
the entire flow of volume through the device. A platinum sensor determines the
oscillation in the measuring head. The measuring converter normalises the
measured oscillation to 0 Hz (without flow) and to 150 Hz for the end of the
measuring range.
View from underneath
Platinum sensor
View from above