(57) A standpipe (31) is connected into a fiber processing system such as a paper making
system, containing refined stock, or unrefined pulp, at operating consistencies. Automatic
control cycles a measurement chamber (34) in the standpipe, through intake measure
and exhaust. A plate (33) mounted across the measurement chamber has at least one
hole (37) of predetermined cross dimension, or diameter, substantially equal to the
relative length of fiber desired. Automatic timing establishes a set intake time for
slurry, or suspension, to pass through the or each hole (37) and contact lower (68)
and/or upper (69) level sensors or other level indicators, in the chamber. Read-out
is provided to indicate "too short", "too long" or "correct length" with each cycle.
Differential pressure, across the or each hole during measure, as well as approach
velocity, is appropriately controlled.
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