R E C 4 1 0 5
1 - 1
Chapter 1
Introduction to the ORETRONIC
III Tramp Metal Detector
T h i s ch a p t e r i n t r o d u c e s t h e O R E T R O N I C I I I T r a mp M e t a l D et e c t o r ( T M D) .
I t g i v e s an o v er v i e w o f t h e d ev i ce ’ s c a p ab i l i t i e s, d e s c r i b e s i t s b a si c
f u n c t i o n a l i t y , an d l i s t s i t s t e ch n i c a l s p e ci f i c a t i o n s.
1.1 Overview
T h e
O R E T R O N I C I I I
T r a mp M e ta l D e t e ct o r (
T M D
) d e t e c t s t h e p r e s e n c e o f
t r a mp me t a l in b u lk ma t e r i a l b e in g t r a n sp o rte d o n a co n v ey o r b el t.
D e t e c t e d t r a mp me t a l c a n t h en b e r e mo v e d f r o m t h e p r o c e s s s t r e am ma n -
u a l l y o r au t o ma t i c a l l y b y me c h a n i c a l me a n s . R e mo v i n g t h e t r a mp me t a l
p r o t e c t s c r u s h er s , ma t e r i a l h an d l e r s, an d p r o c e s s eq u i p me n t f r o m t h e d a m-
a g e i t may c a u s e .
T h i s h i g h l y r el i ab l e sy s t e m d e t ec t s a ll ty p es o f tr a mp me t a l t h a t c o u l d b e
f o u n d in b u lk ma t e r i al o n b el t c o n v ey o r s ev e n wh e n it i s b u r i ed in w e t, co n -
d u ct iv e ma t e r i a l s. Tra mp me t a l c o u l d i n c l u d e su c h t h i n g s a s b u ck e t t e e t h ,
ma n g a n e s e s t e e l ma n t l e s , b o r e cro w n s, b a r sc r a p , ch a in s , an d to o ls . Th e
b u l k ma t e r ia l (o r b u rd e n ) c an b e p ro d u c t s u c h a s i ro n p e l l et s , mi n e r a l s,
a g g r e g at e s , c o al , o r co k e .
T h e
O R E T R O N I C I I I T M D
c an b e i n s t a l l e d o n c o n v ey o r s w i t h s p ee d s u p t o
1 ,2 0 0 f t/ mi n (6 . 1 m/ s ) . I n ad d i t io n , b e c au se i t i s i n s en s i t i v e t o ma t e r i a l s
w i t h h ig h ma g n e t i c p e r me a b i l i ty a n d el e c t ric a l c o n d u cti v ity , th i s d e t e c to r
c a n b e u s ed i n a p p li ca t i o n s w h er e c o n v e n t io n al me t a l d e t e c to r s p r o d u c e a n
u n a cc e p t ab l e f al s e a l ar m r a t e .
T h e
O R E T R O N I C I I I T M D
h a s a mi c r o p r o c es s o r - b a s e d c o n t r o l u n i t t h a t
a u t o ma t e s sy s t e m s e t u p a n d c a l i b r a t i o n . T h e o p er a t o r i n t e r f a c e p r o v i d e s
e a sy - to -r e a d i n d i c at o rs , a to u ch p a n el k ey p a d d e s i g n e d t o s i mp l i f y s et t i n g
u p , and mai n t ain in g th e sy st em.
1.2
Theory of Operation
T h e
T M D
o p e r a t e s b y g e n er a t in g a p u l s ed ma g n et i c f i eld (th e p r i ma ry
ma g n e t i c f ie l d ) th a t i s r a d i a t ed f ro m i t s t r an s mi t t e r c o il . Th i s fi e ld g e n er -
a t e s a n o u t p u t si g n a l i n t h e r e c e i v e r co i l ( s ee
F i g u r e 1 - 1
)
W h en t h e p u l s e i s t u r n e d o f f, ed d y cu r r en t s i n d u c ed in t r a mp me t a l p ro d u c e
a s e c o n d ar y ma g n et i c f i el d . T h i s n e w f iel d a l so g e n er a t e s a n o u t p u t si g n a l
i n t h e r e c ei v e r co i l . T h e d e t e ct o r me a s u r e s t h e e f f e c t o f t h i s s e c o n d a r y
m a g n e t i c f i e l d o n l y d u r i n g t h e t i m e t h e p r ima r y fi e ld i s in o p er a t iv e .
Summary of Contents for Ramsey ORETRONIC III
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