Siemens SITRANS FUS060 Operating Instructions Manual page 66

Functions
7.6 Service (menu 6)
• Time of flight - down (TOF down)
• Difference in time of flight (delta TOF)
Gain (menu 6.5.1)
Every transducer gain level can be read.
These parameters are read only values and within the range of 0 to 255.
Unused paths will show 0. Normal values are in the range of 40 to 100. High gain values refer
to a high sound absorption in the medium (maximum 255 for no sonic transfer, for example by
empty pipe or if no sensor cable is connected).
Amplitudes (menu 6.5.2)
Each value shows the ultrasonic peak amplitude of the individual transducer in digital units from
0 to 255 corresponding to 0 to 5 V. Optimal values are between 95 and 100. Worst possible
values are close to 0, for example by empty pipe or if no sensor cable is connected.
Trigger level (menu 6.5.3)
Each trigger level is used to recognize the ultrasonic signal. The trigger levels are calculated from
the last signal level amplitudes. Typical values are between 40 and 100. Worst possible values
are close to 128.
Error count % (menu 6.5.4)
The menu shows the error counter in % for each path. The optimal value is 0. Worst possible
values are close to 100, for example by empty pipe or if no sensor cable is connected.
TOF up and TOF down (menus 6.5.5 and 6.5.6)
The time of flight (TOF) is the time in ns the ultrasonic signal takes to travel from one transducer
to the other.
The time of flight is dependent on sensor size, angle, media, and temperature of the media.
Delta TOF (menu 6.5.7)
The time of flight difference is the measured difference in ps: TOF up – TOF down. The typical
value is 1000 ps for a flow velocity of 0 m/s.
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SITRANS FUS060 with PROFIBUS PA
Operating Instructions, 09/2021, A5E02225054-AD