Fujitsu fi-5950 Operator's Manual page 214

Setting Example 2:
Left, Disable, Start=0 mm, End=300 mm
Middle, Enable, Start=0 mm, End=0 mm
Right, Disable, Start=0 mm, End=0 mm
HINT
Setting Example 3 (showing a setting which should not be done):
Left, Disable, Start=310 mm, End=400 mm
Middle, Enable, Start=320 mm, End=450 mm
Right, Enable, Start=100 mm, End=102 mm
* Since the range for the detection area (length) on the right does not meet 5mm, the multifeed detection cannot be
performed correctly.
194
8.4 Multifeed Detection
When you want to detect overlapping, be sure that paper documents are not
clinging to each other. Those clinging documents (glued or with static cling)
may cause a lower multifeed-detection ratio.
Unit: mm
Unit: mm