Siemens SITRANS FUS1020, Manual, Page: 16 / 251

1-5
1020NFM-1D
Section 1
1.3 DESCRIPTION OF CHANNEL FUNCTIONS (FUS1010DN Systems only)
Dual Path FUS1020DN systems provide two flow measurement channels that allow its operation as
two completely independent single-channel flow meters. In addition, you can combine the two mea-
surement channels in the various meter types described below to enhance the functionality of the
system. On single channel systems, you do not get a choice of meter types since this requires two
independent measurement channels.
Dual Path Flow
Dual Path Flow uses two measurement channels to achieve a single output via a “virtual” third chan-
nel. The resultant data is the average of the two channels. This meter type only supports clamp-on or
in-line transit-time operation. Benefits include highest available precision and enhanced immunity from
distorted flow profile conditions.
Virtual
Channel
3
Channel 1
Flow
Channel 2
Flow
Ch1 + Ch2
2
Output
(average of
Ch 1 & Ch 2)
Pipe
Dual Channel Flow
Dual Channel Flow provides two independent measurement channels that operate simultaneously.
Channel 1
Flow
Channel 2
Flow
PIPE `A'
PIPE `B'
Pipe 'A' Flow Rate
Pipe 'B' Flow Rate
Channel 1+2 Flow
Channel 1+2 produces a data output via a virtual Channel 3, proportional to the sum of the flow of two
independent pipes. This requires setting the two flow channels to operate independently.