Endress+Hauser Gammapilot FMG50 - FMG50 Units

Electrical connection Gammapilot FMG50
38 Endress+Hauser
For more information, see:
BA00287R
5.11.3 Cascade mode with more than 2 FMG50 units
Level measurement: FMG50 with Memograph M RSG45
Conditions requiring several FMG50 units:
• Large measuring ranges
• Special tank geometry
More than two FMG50 units (maximum 20) can be interconnected and powered via one
Memograph M RSG45. The pulse rates (cnt/s) of the individual FMG50 units are added
together and linearized; this gives the total level.
To enable the application, the settings must be made on every FMG50. In this way, the
actual level in the vessel can be determined over all the anticipated cascade areas. While
the calculation is the same for all FMG50 devices in the cascade, the constants for every
FMG50 unit vary and must remain editable.
The cascade mode requires at least 2 FMG50 units that communicate with the RSG45
via the HART channel.
Avoid overlap between the individual measuring ranges as this can result in an
incorrect measured value. The devices can overlap provided this does not affect the
measuring ranges.
1
2
3
5
4
6
A0044427
 11 Connection diagram: for three FMG50 units (up to 20 FMG50s) connected to one RSG45
1 RSG45
2 Algorithm: addition of the individual pulse rates (SV_1 + SV_2 + SV_3) and subsequent linearization
3 HART signal FMG50 (1), PV_1: level, SV_1: pulse rate (cnt/s)
4 HART signal FMG50 (2), PV_2: level, SV_2: pulse rate (cnt/s)
5 HART signal FMG50 (3), PV_3: level, SV_3: pulse rate (cnt/s)
6 Overall output signal
Settings
All FMG50 units used in cascade must be adjusted individually. This is possible via the
"Commissioning" Wizard for example
1. Select the "Level" operating mode for all the FMG50 units