Gammapilot FMG50
30 Endress+Hauser
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.
Measuring system arrangement
A0042063
1 Arrangement of multiple FMG50 units
2 Density profile measurement
Description
To obtain detailed information on the distribution of layers of different densities in a vessel, a
density profile is measured using a multi-detector solution. Several FMG50 units are installed next to
one another on the outside of the vessel wall for this purpose. The measuring range is divided into
zones and each compact transmitter measures the density value in its respective zone. A density
profile is derived from these values.
This results in a high-resolution measurement of the distribution of medium layers (e.g. in
separators)
For more information, see:
CP01205F
Installation conditions for
concentration measurement
Conditions
• If possible, the concentration should be measured on vertical pipes with forward flow from bottom
to top.
• If only horizontal pipes are accessible, the path of the beam should also be arranged horizontally
to minimize the influence of air bubbles and deposits.
• The Endress+Hauser FHG51 clamping device or an equivalent clamping device should be used to
fasten the source container and the Gammapilot FMG50 to the measuring pipe.
The clamping device itself must be installed in such a way as to withstand the weight of the source
container and the Gammapilot FMG50 under all anticipated operating conditions.
• The sample point may not be further than 20 m (66 ft) from the measuring point.
• The distance of the density measurement to pipe bends is ≥3 x pipe diameter, and ≥10 x pipe
diameter in the case of pumps.
Measuring system arrangement
The arrangement of the source container and the Gammapilot FMG50 depends on the pipe diameter
(or the radiated length) and the density measuring range. These two parameters determine the
measuring effect (relative change in the pulse rate). The longer the radiated length, the greater the
measuring effect. Therefore, it is advisable to use diagonal irradiation or a measuring path for small
pipe diameters.
To select the measuring system arrangement please contact the Endress+Hauser sales organization
or use the Applicator™configuration software.
3)
3) The Applicator™ is available from your Endress+Hauser sales organization.
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