The materials included in this compilation are for the use of Dwyer Instruments, Inc. potential customers and current employees as a resource only. They may not be reproduced, published, or transmitted electronically for commercial purposes. Furthermore, the Company’s name, likeness, product names, and logos, included within these compilations may not be used without specific, written prior permission from Dwyer Instruments, Inc. ©Copyright 2015 Dwyer Instruments, Inc.

1. Condensation Issues in
Instrumentation Enclosures and
How to Prevent Them
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. Condensation Issues
O v e r v i e w
 M a n y D w y e r I n s t r u m e n t s , I n c . e l e c t r i c a l p r o d u c t s a r e c o n n e c t e d
t o t h e r e c e i v e r a n d p o w e r s u p p l y w i t h w i r e s t h a t a r e r u n t h r o u g h
e l e c t r i c a l c o n d u i t s
 T h e c o n d u i t o f t e n p a s s e s t h r o u g h
m u l t i p l e a m b i e n t t e m p e r a t u r e z o n e s
i n t h e b u i l d i n g o r p l a n t i n s t a l l a t i o n

3. Condensation Issues
O v e r v i e w
 T h e s e t e m p e r a t u r e c h a n g e s c a n m a k e w a t e r v a p o r c o n d e n s a t e
i n s i d e t h e c o n d u i t
 I f t h i s c o n d e n s a t i o n f l o w s i n t o o r f o r m s i n t h e i n s t r u m e n t , i t c a n
c r e a t e e l e c t r i c a l s h o r t s o r l e a d t o c o r r o s i o n t h a t w i l l c a u s e a n
i n s t r u m e n t f a i l u r e

4. Condensation Issues
O v e r v i e w
 To p r e v e n t i n s t r u m e n t f a i l u r e , i t i s a l w a y s r e c o m m e n d e d t h a t a
c o n d u i t b e r u n u p v e r t i c a l l y f r o m b e l o w t h e i n s t r u m e n t ,
r a t h e r t h a n d o w n o r h o r i z o n t a l l y, s o t h a t
a n y c o n d e n s a t i o n i n t h e c o n d u i t d r i p s
a w a y f r o m t h e i n s t r u m e n t

5. Condensation Issues
O v e r v i e w
 C o n d u i t a c c e s s o r i e s a r e a l s o u s e d t o p r e v e n t
c o n d e n s a t i o n b u i l d u p
 C o n d u i t s e a l a n t s , s u c h a s s i l i c o n e
a n d e x p a n d i n g f o a m , p r e v e n t
w a t e r v a p o r i n f i l t r a t i o n f r o m
o n e s e c t i o n o f a c o n d u i t t o a n o t h e r

6. Condensation Issues
O v e r v i e w
 B r e a t h e r s a l l o w v e n t i l a t i o n t o m i n i m i z e c o n d e n s a t i o n

7. Condensation Issues
O v e r v i e w
 D r a i n s l e t c o n d e n s a t i o n t h a t h a s c o l l e c t e d d r a i n o u t

8. Condensation Issues
O v e r v i e w
 C o n d e n s a t i o n i s a l s o a c o n c e r n w i t h e x p l o s i o n - p r o o f e n c l o s u r e s
t h a t a r e s e a l e d a n d c a n t r a p
w a t e r v a p o r i n s i d e
 T h e w a t e r v a p o r c o n d e n s e s w i t h
a m b i e n t t e m p e r a t u r e c h a n g e s
 M a n y o f D w y e r ’s e x p l o s i o n - p r o o f
s w i t c h p r o d u c t s o f f e r b r e a t h e r
a n d d r a i n o p t i o n s f o r t h e
e n c l o s u r e

9. Condensation Issues
O v e r v i e w
 A l w a y s r e f e r t o t h e N a t i o n a l E l e c t r i c a l C o d e a n d l o c a l c o d e s f o r
p r o p e r w i r i n g a n d s e a l i n g f o r y o u r a p p l i c a t i o n