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.
B.2
Sensor dimension dependent default settings
B.2.1
Mass flow
MASS 2100
Sensor size
Default value kg/s
Upper alarm limit and Upper warning limit
DI 1
0.010
DI 1.5
0.022
DI 2.1
0.043
DI 3
0.088
DI 6
0.353
DI 15
2.209
Lower alarm limit and Lower warning limit
DI 1
-0.010
DI 1.5
-0.022
DI 2.1
-0.043
DI 3
-0.088
DI 6
-0.353
DI 15
-2.209
Sensor size
Default value kg/s
Default value kg/h
Low flow cut-off
DI 1
0.0000272
0.0980
DI 1.5
0.0000542
0.195
DI 2.1
0.000117
0.42
DI 3
0.000250
0.90
DI 6
0.00139
5
DI 15
0.0106
38
Technical reference
B.2 Sensor dimension dependent default settings
SITRANS MASS 2100 & FC300 (FCT010/DSL)
140
Operating Instructions, 06/2020, A5E39788682-AB