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Applications
Note:
For best performance and limited maintenance requirements, keep in mind
material compatibility and flow patterns.
Materials
Material characteristics for best results:
•
Low cohesion (flows well through chutes angled 50° or higher, similar to a liquid)
•
Low adhesion (does not stick to surfaces)
•
Low abrasion (will not wear out chutes, flowguide or sensing plate)
•
Low causticity (will not damage internal flowmeter components)
Most materials with low moisture content have excellent flow and adhesion
characteristics. In processes where material moisture content varies, select a flowmeter
location where the moisture content is lowest. Sensing plate and flowguide non-stick
linings are often used for fertilizer, wheat flour, sugar, and other materials with similar
properties.
Abrasive materials are best monitored at low velocity. Sensing plate and flowguide
abrasion resistant linings are often used for alumina, asbestos, barley, corn, limestone,
soya beans, wheat, and other materials with similar hardness and particle mass.
Standard flowmeter components are resistant to chemical reaction with most materials.
Special paint or coatings on exposed flowmeter components are often used for carbide,
fertilizer, phosphate, salt, sodium chloride, urea, and other materials with similar
properties.
The L-300 is best applied to free flowing, granular material that will not re-crystalize and
build up in the presence of moisture or high humidity.
Material Feed
Ideal material infeed characteristics:
•
constant and relatively low material velocity
•
uniform material flowrate (not pulsing)
•
negligible air flow through the flowmeter
•
flowguide 17 to 50 % full during operation
For best results, use material from an elevated bin, gravity fed to the flowmeter. If the
material is to be monitored after some process has been performed, choose the feeder
device that provides the most consistent material flow.
Use a reverse flowguide transition when high or variable velocity feeder material
discharges are anticipated. Refer to Flowmeter Infeed Chutes on page 9. Position the
flowmeter discharge chute so material cannot back up into the flowmeter housing.
For heavily pulsing feeder discharges, at less than 1 pulse per second, consult your local
Siemens Milltronics representative.
7ML19985EQ01
Milltronics L-300 – INSTRUCTION MANUAL
Page 7
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