FGM 160 Operating Instructions
• Gas density and mass flow calculations are calculated based on calculated velocity of
sound and measured pressure and temperature.
• Volume and mass totalising calculations are continuously updated based on volumetric
and mass flow rate calculations.
• All system configuration parameters are stored in the Flash memory (non-volatile
memory) at the DSP Module.
• The DSP Module carries out self-checking and evaluation of input and calculated
parameters.
3.2.2 P&T Module
• The P&T Module continuously collects pressure and temperature values from the
external pressure and temperature transmitters mounted downstream of the FGM 160.
These readings are used in calculations performed by the DSP module.
• In addition to the external temperature reading, the P&T also reads the internal
temperature value. This value is used to monitor the internal temperature in the Ex-d
enclosure.
3.2.3 I/O Module
• The I/O Module handles all signals and communication with systems in Safe Area.
• Data requests and commands from UFM Manager are processed by the I/O Module. A
predefined number of accessible parameters are available from the FGM. Accessible
parameters depend on whether 4-20 mA, HART or Modbus is utilized.
• Software downloads to the DSP-, P&T- and I/O Module are carried out by the I/O-
module.
• All data requests from DCS system are handled by the I/O Module; either through
Modbus or HART interfaces.
3.3 Device Integrity
3.3.1 Self-Checking
The FGM 160 performs a self-checking sequence, where it checks that inputs from the
transducers and Temperature and Pressure transmitters are within a valid range, and that
other functions are operating as intended.
3.3.2 Watchdog Timer
The Watchdog Timer is initialized at start-up, and cannot be disabled, ensuring that in the
unlikely situation of system hang-up occurring, the Watchdog Timer will reset the system
forcing a complete reboot and start-up.
3.3.3 Flash Memory
System configuration is stored in Flash Memory (non-volatile memory). In case of a power
break, all system configurations are reloaded from the Flash memory
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