ORET RONIC
™
Tramp Metal Detector
R E C 4 1 0 5
4 - 1 6
4.5.1 Adjusting Metal Sensitivity
T h e mo s t co m mo n c au s e o f u n d e t e c t e d t r a mp i s h a v i n g t h e me t a l s e n s i t i v i t y
s e t t in g to o l o w f o r t h e t r a mp y o u a r e t ry ing to d e tect. W h en e v e r y o u c a l -
i b r at e t h e T M D fo r tra mp me t a l , ma k e s u r e y o u u s e t h e s a me s i z e , s h ap e , a n d
ty p e o f me t a l fo r th e ca l i b r a t io n th a t y o u ex p e c t to tr ip th e d e t e c to r d u ri n g
n o r ma l o p er a t i o n .
T h e T M D is d e si gn e d s o t h at wh en i t i s au to- c a l ib r a t ed, th e th r e sho ld f o r a
t r i p i s j u st s l i g h t l y l e s s t h a n t h e si g n a l s e e n w h e n t h e me t a l w a s p as s e d d u r -
i n g t h e c a lib r a ti o n . A s ma l l i r r eg u l a r ity i n t h e s h ap e o f t h e t r a mp o r a v a r i -
a t i o n i n p l a c e me n t b et w e e n t h e co i l s w il l r es u l t i n a s l i g h t l y d i f f er e n t
s t r e n g t h s i g n al . F o r t h e s e r e a so n s , a r o u n d b al l g i v e s t h e mo s t co n si s t en t
c a l i b r a t io n r e s u l t s. Ev e n u sin g a b al l f o r c al i b r a ti o n , h o w e v e r, th e me t a l
t h r e sh o ld v a l u e ma y v a ry a f e w d i g it s f ro m c a l i b r a t io n to c a li b r a ti o n .
F o llo w th i s p ro c ed u r e t o a d j u st t h e me t a l s e n s i t iv ity o f th e TM D .
1 .
P e r fo r m a n a u t o - c al ib r a t io n fo r b o t h co a r s e a n d f in e me t a l
s e n s i t i v i t y a s d e s c r i b ed i n
S e ct io n 3 .3 . 4 .
2 .
P l a c e t h e T M D i n R u n mo d e an d p a s s t h e t es t t r a mp t h r o u g h
t h e c o i l s i n t h e n o r ma l d i r e c t i o n o f t r av e l .
I f th e T M D d o e s n o t t ri p , o b s er v e th e b a r g ra p h . I f th e L E D
l e v e l o n th e b a r g r a p h d o e s
n o t
i n c r e a s e wh e n t h e t r a mp i s
p a s s e d t h r o u g h t h e co i l s , t h er e i s a mo r e s e r i o u s p r o b l e m t h a n a
l o w s e n si t i v i t y s e t t i n g . G o o n t o
T e s ti n g fo r C o i l o r Ju n ct io n
B o x D a m a g e o n p a g e 6 8
o r
D et er m i n in g TM D M a l fu n c t i o n o n
p a g e 7 1
.
I f th e T M D d o e s n o t t ri p , b u t t h e L E D l e v el o n th e b a r g r ap h
i n c r e a s e s w h e n t h e t r a mp i s p a ss e d , g o o n t o
S t e p 3
.
3 .
P a s s t h e t es t t r a mp t h r o u g h t h e co i l s i n t h e
o p p o s i t e
d i r e ct i o n
o f n o r ma l t r a v e l .
I f t h e T M D t r i p s, t h e p o l a r i t y o f t h e r e c e i v er c o i l i s r ev e r s ed .
G o o n t o
S t e p 4
.
I f t h e T M D d o e s n o t t r i p w h en t h e t r a mp i s p a s s e d i n ei t h er
d i r e ct i o n , b u t t h e L E D l e v el i n cr e a s e s ( i n d i c a t i n g a me t a l
s i g n a l ) , t h e s e n si t i v i t y v al u e s n e ed t o b e ad ju s t ed ma n u a l ly . Go
t o
S t e p 7
.
4 .
C h e c k t h e ma r k i n g o n t h e r e c ei v e r c o i l to ma k e s u r e i t i s
i n s t al l ed co r r e ct l y . ( R e f e r t o t h e a p p r o p r i at e
O u t li n e, M o u n t in g
a n d A s s e mb l y, C o i l S t a n d
, d r a w in g . )
5 .
I f th e c o i l i s in s t al l ed c o rr e c t l y , r e v e r s e t h e b l a c k a n d c l e a r
w i r e s f r o m t h e r e c ei v e r c o i l i n th e co nt ro l u n i t or ch an g e th e
p o si ti o n o f D I P S w it ch 4 o n t h e d i sp l ay b o ar d , th en p o w e r cy cl e
t h e
T M D.
6 .
T e s t t h e d et e c t o r b y p a s s i n g t h e me t a l t h r o u g h i n t h e d i r e c t i o n
o f
n o r ma l
t r a v e l .
Summary of Contents for Ramsey ORETRONIC III
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