user manual

33
Reference Manual
00809-0700-4530, Rev AA
Section 2: Installation Considerations
September 2013
Installation considerations
Step 4: inclination of antenna
NOTE:
Too great of an angle can create problems in detecting surface echo at the bottom region. The
angle of the slope differs during filling and emptying. Therefore, monitor the entire cycle in
order to verify and determine an optimum antenna inclination.
Table 2-10. Sample solid applications where non-contacting radar is preferred over GWR
Applications
(1)
(1) These applications (except salt) typically involve tall vessels and therefore require the parabolic antenna option. The 8-in. cone antenna option can be used in the
salt application where the vessel height is less than 50 ft. (15 m).
Common Characteristics
PTFE Bag
Recommended
(2)
(2) The PTFE bag is only available for the parabolic antenna. If a cone antenna is used, consider the flushing connection option.
Particle Size Vapor Space
Dust or
Powder
Small
(<1 in.)
Larger
(>1 in.)
Dust
Steam or
Condensation
Wood chip bins
(3)
(3) For interstice silos, the antenna can be inclined 0.5 in. to 2 in. towards the surface slope.
Yes Yes Yes Yes Possible Yes
Grain silo - small kernel
grains
(3)
Yes Yes No Yes No Yes
Grain silo - large kernel
grains
No Yes No No No No
Lime stone silo No Yes Yes Possible No No
Cement - raw mill silo
(4)
(4) For interstice silos, the radar must be installed so that the radar signal clearly passes internal support structures without interferences.
Yes Yes No Yes No Yes
Cement - finished product
silo
(4)
Yes Yes No Yes No Yes
Coal bin
(5)
(5) Clean the antenna regularly.
Yes Yes Yes Yes Yes No
Saw dust Yes Yes No Yes No Yes
High consistency pulp stock No No No No Yes No
Alumina Yes Yes No Yes No Yes
Salt No Yes Yes No No No
 If the surface echo is weak, the
parabolic antenna can be inclined 0.5°
to 2° towards the surface slope in
order to increase the reflected signal.