Siemens SITRANS WF100, Руководство по эксплуатации, Страница: 18 / 45

Description
3.1 Material feed examples
SITRANS WF100
16
Operating Instructions, 02/2012, 7ML19985NB01-01
Flowmeter in-feed chutes
The flowmeter in-feed chute delivers the material from the bin or feeder discharge to the
flowmeter flowguide. The ideal in-feed chute pre-conditions the material flow to minimize the
effect of abrasion, velocity variation, feeder discharge trajectory variation, and pulsing.
Feeder/flowguide transition
•
reverse flowguide transition reverses direction of the bin or
feeder material discharge before the material enters the
flowmeter flowguide
•
reversing direction forces the material into a desirable flow
pattern rather than permitting material to be flung from the
feeder, directly into the flowguide
•
transition is especially important for high or variable speed
feeders
①
baffle plate
•
forward flowguide transition maintains the material in the same
direction between the bin or feeder discharge and the
flowmeter flowguide
•
transition is acceptable for a low and constant velocity feeder
•
if a forward flowguide transition must be used for a high or
variable speed feeder application, install a baffle plate
Short fall chute
①
< 0.6 m (2 ft)
•
material in-feed chute where the bin or feeder discharge to
flowmeter flowguide fall is less than 0.6 m (2 ft)
•
material velocity due to gravity minimized
•
chute centreline and angle should coincide with that of the
flowguide, for a distance greater than or equal to the flowguide
diameter (before the flowguide inlet)