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Switch Actuation and Deactuation
T h e m a t e r i a l s i n c l u d e d i n t h i s c o m p i l a t i o n a r e f o r t h e u s e o f D w y e r I n s t r u m e n t s , I n c . p o t e n t i a l c u s t o m e r s
a n d c u r r e n t e m p l o y e e s a s a r e s o u r c e o n l y . T h e y m a y n o t b e r e p r o d u c e d , p u b l i s h e d , o r t r a n s m i t t e d
e l e c t r o n i c a l l y f o r c o m m e r c i a l p u r p o s e s . F u r t h e r m o r e , t h e C o m p a n y ’ s n a m e , l i k e n e s s , p r o d u c t n a m e s , a n d
l o g o s , i n c l u d e d w i t h i n t h e s e c o m p i l a t i o n s m a y n o t b e u s e d w i t h o u t s p e c i f i c , w r i t t e n p r i o r p e r m i s s i o n f r o m
D w y e r I n s t r u m e n t s , I n c .
© C o p y r i g h t 2 0 1 5 D w y e r I n s t r u m e n t s , I n c .
Switch Actuation/Deactuation
O v e r v i e w
 D w y e r I n s t r u m e n t s o f f e r s m a n y e l e c t r i c a l s w i t c h p r o d u c t s t h a t
m a k e o r b r e a k a c o n t a c t b a s e d o n s e n s i n g a p a r a m e t e r s u c h a s
p r e s s u r e , t e m p e r a t u r e , o r l e v e l
O v e r v i e w
 M o s t s w i t c h e s a r e s i n g l e p o l e d o u b l e t h r o w, o f t e n r e f e r r e d t o a s
S P D T
 T h i s t y p e o f s w i t c h h a s o n e n o r m a l l y
o p e n c o n t a c t a n d o n e n o r m a l l y c l o s e d
c o n t a c t
Switch Actuation/Deactuation
O v e r v i e w
 S w i t c h e s c a n a l s o b e d o u b l e p o l e d o u b l e t h r o w, o r D P D T, t h a t
h a v e t w o n o r m a l l y o p e n a n d t w o n o r m a l l y c l o s e d c o n t a c t s
 S i n g l e p o l e s i n g l e t h r o w s w i t c h e s
w i t h j u s t o n e c o n t a c t a r e a l s o
a v a i l a b l e a n d a r e s p e c i f i e d t o
b e e i t h e r n o r m a l l y o p e n o r
n o r m a l l y c l o s e d
Switch Actuation/Deactuation
O v e r v i e w
 S w i t c h e s h a v e a s e t p o i n t t h a t i s t h e v a l u e w h e r e t h e c o n t a c t w i l l
c h a n g e s t a t e
 A l l D w y e r s w i t c h e s w o r k o n a n
i n c r e a s e o f v a l u e , s o t h e c o n t a c t
w i l l c h a n g e s t a t e a s t h e p a r a m e t e r
i n c r e a s e s t o t h e s e t p o i n t
 T h e n o r m a l s t a t e o f t h e c o n t a c t ,
n o r m a l l y o p e n o r n o r m a l l y c l o s e d ,
i s t h e c o n t a c t s t a t e b e l o w t h e s e t p o i n t
Switch Actuation/Deactuation
O v e r v i e w
 O n c e t h e p a r a m e t e r i n c r e a s e s t o t h e s e t p o i n t , t h e s w i t c h
a c t u a t e s , a n d t h e c o n t a c t c h a n g e s f r o m
t h e n o r m a l s t a t e t o t h e a c t u a t e d s t a t e
 A n o r m a l l y c l o s e d c o n t a c t w i l l c h a n g e t o
o p e n a n d a n o r m a l l y o p e n c o n t a c t w i l l
c h a n g e t o c l o s e d
 T h e s w i t c h w i l l s t a y i n t h i s s t a t e a s l o n g
a s t h e p a r a m e t e r s t a y s a b o v e t h e
d e a d b a n d v a l u e
Switch Actuation/Deactuation
O v e r v i e w
 D e a d b a n d , o r d i f f e r e n t i a l , i s t h e v a l u e t h a t a p a r a m e t e r n e e d s t o
g o b e y o n d t h e s e t p o i n t t o r e v e r t b a c k
t o t h e n o r m a l s t a t e
 S w i t c h e s o f t e n h a v e a f i x e d d e a d b a n d
t h a t c a n n o t b e c h a n g e d a n d i s l i s t e d
i n t h e s p e c i f i c a t i o n s
 O r, s w i t c h e s c a n h a v e a d j u s t a b l e
d e a d b a n d t h a t c a n b e c h a n g e d o v e r
t h e r a n g e o f t h e s w i t c h
Switch Actuation/Deactuation
O v e r v i e w
 D i g i t a l s w i t c h e s a n d c o n t r o l l e r s c a n h a v e t h e d e a d b a n d s e t t o a n y
v a l u e
 Ty p i c a l l y f i x e d d e a d b a n d s a r e u s e d
f o r a l a r m a p p l i c a t i o n s a n d a d j u s t a b l e
d e a d b a n d s a r e u s e d f o r c o n t r o l
a p p l i c a t i o n s
Switch Actuation/Deactuation
O v e r v i e w
 A f t e r t h e p a r a m e t e r d e c r e a s e s , t h e s w i t c h d e a c t u a t e s o n c e i t h a s
g o n e d o w n p a s t t h e s w i t c h s e t p o i n t
a n d d e a d b a n d
 O n c e p a s t t h e d e a d b a n d , t h e s w i t c h
c o n t a c t s r e s e t a n d r e v e r t b a c k t o
t h e n o r m a l s t a t e
Switch Actuation/Deactuation
O v e r v i e w
 M o s t s w i t c h e s a u t o m a t i c a l l y r e s e t o n c e p a s t t h e d e a d b a n d b u t
t h e r e a r e o p t i o n s f o r s w i t c h e s t h a t
w i l l n o t r e v e r t b a c k u n t i l a m a n u a l
r e s e t i s p e r f o r m e d
 T h i s f e a t u r e i s u s u a l l y u s e d f o r
a p p l i c a t i o n s t h a t r e q u i r e a s a f e t y
c h e c k t o m a k e s u r e i t i s s a f e t o
o p e r a t e i n n o r m a l m o d e a g a i n
Switch Actuation/Deactuation

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Switch Actuation and Deactuation

  • 1. Switch Actuation and Deactuation T h e m a t e r i a l s i n c l u d e d i n t h i s c o m p i l a t i o n a r e f o r t h e u s e o f D w y e r I n s t r u m e n t s , I n c . p o t e n t i a l c u s t o m e r s a n d c u r r e n t e m p l o y e e s a s a r e s o u r c e o n l y . T h e y m a y n o t b e r e p r o d u c e d , p u b l i s h e d , o r t r a n s m i t t e d e l e c t r o n i c a l l y f o r c o m m e r c i a l p u r p o s e s . F u r t h e r m o r e , t h e C o m p a n y ’ s n a m e , l i k e n e s s , p r o d u c t n a m e s , a n d l o g o s , i n c l u d e d w i t h i n t h e s e c o m p i l a t i o n s m a y n o t b e u s e d w i t h o u t s p e c i f i c , w r i t t e n p r i o r p e r m i s s i o n f r o m D w y e r I n s t r u m e n t s , I n c . © C o p y r i g h t 2 0 1 5 D w y e r I n s t r u m e n t s , I n c .
  • 2. Switch Actuation/Deactuation O v e r v i e w  D w y e r I n s t r u m e n t s o f f e r s m a n y e l e c t r i c a l s w i t c h p r o d u c t s t h a t m a k e o r b r e a k a c o n t a c t b a s e d o n s e n s i n g a p a r a m e t e r s u c h a s p r e s s u r e , t e m p e r a t u r e , o r l e v e l
  • 3. O v e r v i e w  M o s t s w i t c h e s a r e s i n g l e p o l e d o u b l e t h r o w, o f t e n r e f e r r e d t o a s S P D T  T h i s t y p e o f s w i t c h h a s o n e n o r m a l l y o p e n c o n t a c t a n d o n e n o r m a l l y c l o s e d c o n t a c t Switch Actuation/Deactuation
  • 4. O v e r v i e w  S w i t c h e s c a n a l s o b e d o u b l e p o l e d o u b l e t h r o w, o r D P D T, t h a t h a v e t w o n o r m a l l y o p e n a n d t w o n o r m a l l y c l o s e d c o n t a c t s  S i n g l e p o l e s i n g l e t h r o w s w i t c h e s w i t h j u s t o n e c o n t a c t a r e a l s o a v a i l a b l e a n d a r e s p e c i f i e d t o b e e i t h e r n o r m a l l y o p e n o r n o r m a l l y c l o s e d Switch Actuation/Deactuation
  • 5. O v e r v i e w  S w i t c h e s h a v e a s e t p o i n t t h a t i s t h e v a l u e w h e r e t h e c o n t a c t w i l l c h a n g e s t a t e  A l l D w y e r s w i t c h e s w o r k o n a n i n c r e a s e o f v a l u e , s o t h e c o n t a c t w i l l c h a n g e s t a t e a s t h e p a r a m e t e r i n c r e a s e s t o t h e s e t p o i n t  T h e n o r m a l s t a t e o f t h e c o n t a c t , n o r m a l l y o p e n o r n o r m a l l y c l o s e d , i s t h e c o n t a c t s t a t e b e l o w t h e s e t p o i n t Switch Actuation/Deactuation
  • 6. O v e r v i e w  O n c e t h e p a r a m e t e r i n c r e a s e s t o t h e s e t p o i n t , t h e s w i t c h a c t u a t e s , a n d t h e c o n t a c t c h a n g e s f r o m t h e n o r m a l s t a t e t o t h e a c t u a t e d s t a t e  A n o r m a l l y c l o s e d c o n t a c t w i l l c h a n g e t o o p e n a n d a n o r m a l l y o p e n c o n t a c t w i l l c h a n g e t o c l o s e d  T h e s w i t c h w i l l s t a y i n t h i s s t a t e a s l o n g a s t h e p a r a m e t e r s t a y s a b o v e t h e d e a d b a n d v a l u e Switch Actuation/Deactuation
  • 7. O v e r v i e w  D e a d b a n d , o r d i f f e r e n t i a l , i s t h e v a l u e t h a t a p a r a m e t e r n e e d s t o g o b e y o n d t h e s e t p o i n t t o r e v e r t b a c k t o t h e n o r m a l s t a t e  S w i t c h e s o f t e n h a v e a f i x e d d e a d b a n d t h a t c a n n o t b e c h a n g e d a n d i s l i s t e d i n t h e s p e c i f i c a t i o n s  O r, s w i t c h e s c a n h a v e a d j u s t a b l e d e a d b a n d t h a t c a n b e c h a n g e d o v e r t h e r a n g e o f t h e s w i t c h Switch Actuation/Deactuation
  • 8. O v e r v i e w  D i g i t a l s w i t c h e s a n d c o n t r o l l e r s c a n h a v e t h e d e a d b a n d s e t t o a n y v a l u e  Ty p i c a l l y f i x e d d e a d b a n d s a r e u s e d f o r a l a r m a p p l i c a t i o n s a n d a d j u s t a b l e d e a d b a n d s a r e u s e d f o r c o n t r o l a p p l i c a t i o n s Switch Actuation/Deactuation
  • 9. O v e r v i e w  A f t e r t h e p a r a m e t e r d e c r e a s e s , t h e s w i t c h d e a c t u a t e s o n c e i t h a s g o n e d o w n p a s t t h e s w i t c h s e t p o i n t a n d d e a d b a n d  O n c e p a s t t h e d e a d b a n d , t h e s w i t c h c o n t a c t s r e s e t a n d r e v e r t b a c k t o t h e n o r m a l s t a t e Switch Actuation/Deactuation
  • 10. O v e r v i e w  M o s t s w i t c h e s a u t o m a t i c a l l y r e s e t o n c e p a s t t h e d e a d b a n d b u t t h e r e a r e o p t i o n s f o r s w i t c h e s t h a t w i l l n o t r e v e r t b a c k u n t i l a m a n u a l r e s e t i s p e r f o r m e d  T h i s f e a t u r e i s u s u a l l y u s e d f o r a p p l i c a t i o n s t h a t r e q u i r e a s a f e t y c h e c k t o m a k e s u r e i t i s s a f e t o o p e r a t e i n n o r m a l m o d e a g a i n Switch Actuation/Deactuation