FGM 160 Operating Instructions
3.1.5 Electronic Modules in FGM 160
3.1.5.1 Digital Signal Processing (DSP) Module
The Digital Signal Processing module is the processing module in the system. The DSP
Module generates the ultrasound measurement signals and controls the measurement
sequences. It collects data from the other module registers and performs flow calculations
based on this data. All calculated parameters are stored in defined registers. All of these
registers are available for UFM Manager software through the Modbus service port at the I/O
Module. A selection of these registers is also available for the DCS system (through the DCS
port at the I/O Module).
3.1.5.2 Analog Front End (AFE) Module
The Analog Front End Module is the interface between the DSP Module and the ultrasonic
transducers via the IS-Barrier unit. At the AFE Module, measurement signals are multiplexed
and switched between upstream and downstream direction.
3.1.5.3 Pressure & Temperature (P&T) Module
The Pressure & Temperature Module collects pressure and temperature information from
external sensors via 4-20 mA current loop or HART Interface. All pressure and temperature
data are stored in predefined registers available for the DSP Module. Accordingly, the DSP
unit can retrieve P&T parameters in a minimum amount of time.
3.1.5.4 Input/Output (I/O) Module
The Input/Output Module is the interface between the FGM 160 in hazardous areas and
equipment in safe areas. At the I/O Module, 24 VDC (nom.) supply voltage is converted to the
required operational voltages for the other modules. Furthermore, all signals and
communications to and from the DCS system and UFM Manager are handled by this unit.
3.1.5.5 Intrinsic Safety Barrier (IS Barrier) Module
The Intrinsic Safety Barrier Module ensures the intrinsic safety for operation of the ultrasonic
sensors mounted in hazardous area. In addition, the IS-Barrier Module includes safety barriers
for the P&T transmitters. Therefore, the P&T transmitters with “Ex i” certification can be
interfaced directly to the FGM 160. For specifications regarding the P&T transmitter barriers,
please refer to Hazardous Area Installation Guidelines [1].
3.1.5.6 Surge Protection Module
The Surge protection Module protects the power input and the signal output lines from
externally generated spikes, surges and overvoltage.
3.1.5.7 Local Display Module
The Local Display (LD) Module is the front unit, visible through the Ex-d safety glass. At the
LD, a set of predefined metering process parameters can be viewed. In addition, four LEDs
give the status of Power, Alarms, Measurement and Communication.
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