Endress+Hauser Gammapilot FMG50 - Measuring Principle

Gammapilot FMG50
6 Endress+Hauser
Measuring principle
The radiometric measuring principle is based on the fact that gamma radiation is attenuated when it
penetrates a material. Radiometric measurement can be used for a variety of measuring tasks:
A
B
C
D, E
F
G
A0018108
A Continuous level measurement
B Point level detection
C Interface measurement
D Density measurement
E Concentration measurement (density measurement followed by linearization)
F Concentration measurement with radiating media
G Measurement of mass flow (solids)
Continuous level measurement
A source container with a radiation source and a Gammapilot FMG50 (to receive the gamma
radiation) are mounted on opposite sides of a vessel. The radiation emitted by the radiation source is
absorbed by the medium in the vessel. The higher the level rises, the more radiation is absorbed.
Consequently, the Gammapilot FMG50 receives less radiation as the level of the medium increases.
This effect is used to determine the current level of medium in the vessel. As the Gammapilot
FMG50 is available in different lengths, the detector can be used for measuring ranges of different
sizes.
Point level detection
A source container with a radiation source and a Gammapilot FMG50 (to receive the gamma
radiation) are mounted on opposite sides of a vessel. The radiation emitted by the radiation source is
absorbed by the medium in the vessel. In the case of point level detection, the radiation received by
the Gammapilot FMG50 is usually absorbed completely if the radiation path between the radiation
source and the detector is completely filled with medium. In this case, the level of the medium in the
vessel is at the set limit. The Gammapilot FMG50 indicates the uncovered state (no medium in the
radiation path) with 0% and the covered state (radiation path filled with medium) with 100%.
Density measurement
A source container with a radiation source and a Gammapilot FMG50 (to receive the gamma
radiation) are mounted on opposite sides of a pipe. The radiation emitted by the radiation source is
absorbed by the medium in the pipe. The denser the medium in the radiation path between the
radiation source and the detector, the more radiation is absorbed. Consequently, the Gammapilot
FMG50 receives less radiation as the density of the medium increases. This effect is used to
determine the current density of the medium in the pipe. The density unit can be selected from a
menu.