Endress+Hauser Gammapilot FMG50 - Installation Conditions for Interface Measurement; Installation Conditions for Density Profile Measurement (DPS)

Gammapilot FMG50 Mounting
Endress+Hauser 25
4.2.6 Installation conditions for interface measurement
Conditions
For interface measurement, the Gammapilot FMG50 is typically mounted horizontally at
the upper or lower limit of the interface range. When introducing a radiation source into
an immersion tube, it is important to ensure that the measuring range is already filled
with medium in order to keep the radiation in the vicinity of the source as low as possible.
When a radiation source is used in an immersion tube, the radiation can be aligned with
the measuring range of the Gammapilot FMG50 using a collimator on the immersion tube.
Measuring system arrangement
2
1
1
A0038167
1 Gammapilot (2 pcs)
2 Interface measurement
Description
The measuring principle is based on the fact that the radiation source emits radiation
which is attenuated when it penetrates a material and the medium to be measured. In
radiometric interface measurement, the radiation source is often introduced into a closed
immersion tube via a cable extension. This excludes the possibility of contact between the
radiation source and the medium.
Depending on the measuring range and the application, one or several detectors are
mounted on the outside of the vessel. The average density of the medium between the
radiation source and the detector is calculated from the radiation received. A direct
correlation to the position of the interface can then be derived from this density value.
For more information, see:
CP01205F
4.2.7 Installation conditions for density profile measurement (DPS)
Conditions
For density profile measurement, Gammapilot FMG50 devices are installed horizontally at
defined distances, depending on the size of the measuring range. In the case of density
profile measurement, the radiation source is normally inserted in an immersion tube,
preferably one that is double-walled, and introduced into the vessel. When introducing a
radiation source into an immersion tube, it is important to ensure that the measuring
range is already filled with medium in order to keep the radiation in the vicinity of the
source as low as possible.