Dynasonics Fusion Water Flow Meter - Manual (Page 9)

9
2. PLUMBING
FUSION is equipped with an IN directional arrow pointing in the
flow direction that will produce positive readings with the FLO
DIR set to POS. Mount the meter for best viewing of the display
regardless of the flow direction; the direction can be changed in
CONFIGURATION (see page 22).
If flow through the system is in the direction of the IN arrow, the
FLO DIR should be set to POS.
If flow through the system is opposing the IN arrow, the FLO
DIR should be set to NEG.
Selection of POS and NEG flow direction is covered in detail in the
CONFIGURATION section of this manual.