
Digital signal processing (DSP)
The analog to digital conversion takes place in an ultra low noise sigma delta converter with
high signal resolution. With fast digital signal processing mass flow and density values are
calculated using a patented DFT technology (Discrete Fourier Transformation). The
combination of this patented DFT technology and the fast DSP enables short response time (<
10 ms) to changes in the measured values.
The built-in noise filter is configurable and can be used for improving the performance of the
flowmeter, in case the installation and application conditions are not ideal. Typical process
noise such as gas bubbles (two-phase-flow) can be reduced through the filter functions.
A.2
Sensor dimension dependent default settings
A.2.1
Mass flow: Sensor dimension dependent default settings (Process values)
Mass flow
Sensor dimension
Default value
kg/s
Range
Lower warning limit
DN 15
-2.22
DN 25
-9.72
DN 50
-25
DN 80
-69.44
DN 100
-144.44
DN 150
-238.89
Lower alarm limit
DN 15
-2.22
-8.84 to +8.84
DN 25
-9.72
-24.5 to +24.5
DN 50
-25
-98.2 to +98.2
DN 80
-69.44
-251 to +251
DN 100
-144.44
DN 150
-238.89
Sensor dimension
Default value
kg/s
Range
Upper warning limit
DN 15
2.22
DN 25
9.72
DN 50
25
DN 80
69.44
Technical reference
A.2 Sensor dimension dependent default settings
SITRANS FC330
226
Operating Instructions, 01/2019, A5E44030648-AB