Siemens SITRANS WF100, Operating Instructions Manual, Page: 16 / 45

Description
3.1 Material feed examples
SITRANS WF100
14
Operating Instructions, 02/2012, 7ML19985NB01-01
3.1 Material feed examples
Screw conveyor
①
short pitch
②
double flight
•
most common type of material feeder
•
short pitch and/or double flight screws preferred to reduce the
batch size (and increase the frequency) of the material
discharge pulse, or cut back the flights of a standard screw so
it ends before the discharge opening
•
use reverse flowguide transition for variable operating speeds
or constant speeds above 40 rpm
Rotary feeder
•
provides an air seal between the upstream and/or downstream
process, and the flowmeter
•
required if the material is pneumatically conveyed or
flowmeter/process isolation is required
•
use reverse flowguide transition for variable operating speeds
or constant speeds above 10 rpm
Bucket elevators
•
commonly used for grain applications
•
feeder discharge damping required when slow elevators
(typically chain drive) produce heavily pulsing material
discharge
•
use deadbox if required to reduce material velocity from fast
elevators (typically re-inforced belt drive)