Endress+Hauser Gammapilot FMG50 - Installation Conditions for Concentration Measurement with Radiating Media; Installation Conditions for Flow Measurement

Gammapilot FMG50
Endress+Hauser 31
A
1
B
C
3
2
A0018076
A Vertical beam (90°)
B Diagonal beam (30°)
C Measuring path
1 Sample point
2 Source container
3 Gammapilot FMG50
• When planning, the total weight of the measuring system must be taken into consideration.
• An FHG51 clamping device is available as an accessory
Installation conditions for
concentration measurement
with radiating media
Measurement of the concentration of radiating media in vessels
The concentration of radiating media in vessels can be determined by taking a measurement at the
vessel wall or in an immersion tube in the vessel. The intensity of the radiation received is
proportional to the concentration of the radiating medium in the vessel. It is important to note that
the medium in the vessel also absorbs its own radiation. The detected radiation will not increase
further with larger diameters and the signal is saturated. This saturation length depends on the half-
value layer of the material.
The level in the vessel must be constant in the vicinity of the detector to ensure the measurement is
correct.
Measurement of the mass flow of radiating media
In the case of belt scales and pipes, the concentration of the radiating medium can be measured in
the sample. Here, the device is mounted above or below the conveyor belt so that it is parallel to the
belt direction, or is mounted on the pipe. The intensity of the radiation received is proportional to the
concentration of the radiating medium in the conveyed material.
Installation conditions for
flow measurement
Measurement of mass flow (liquids)
The density signal determined by the Gammapilot FMG50 is transmitted to the Promag 55S. The
Promag 55S measures the volume flow; the Promag can determine a mass flow in connection with
the calculated density value.
r
C
r
S
1
2
r
M
m
V
A0018093
 10 Mass flow measurement (m) using a density meter and a flowmeter. If the density of the solids (ρ
s
) and
the density of the carrier liquid (ρ
c
) are also known, the solids flow rate can be calculated.
1 Gammapilot FMG50 -> total density ( ρ
m
) consisting of the carrier liquid and solids
2 Flowmeter (Promag 55S) -> volume flow (V). The solids density (ρ
s
) and the density of the carrier liquid (ρ
c
)
also have to be entered in the transmitter