Viking BLK-3-EWP Application Note

APPLICATION
APPLICATION
T
T
E L E
E L E
Enhanced Weather Protection Now Available
you can adjust microphone and speaker volumes and set program-
ming features right at the installation site.
Then, we hand solder all wires to eliminate the kind of corrosion that
can occur in ordinary electrical connectors. We also hand seal the
connections at the push button switch, microphone, and "Call
Connected" LED using a special non-corrosive silicone sealant. We
use a special microphone boot that acts as a shield against water penetration. A mylar
speaker is used with rubber mounting gasket. Closed cell foam gasketing is used
behind front panels to prevent water penetration.
Finally we "Pot" the entire board in a clear flexible urethane
encapsulating material leaving the weather sealed field-
adjustable trim pots and DIP switches accessible. Our flexible
polyurethane sealant allows the circuit board and it's components
to expand and contract, while maintaining weather resistance. To
protect tip and ring connections, we include connectors filled with
anti-corrosive sealing gel.
F e a t u r e s
F e a t u r e s
• Urethane potting for:
- Maintaining flexibilty at low temperatures
- Excellent electrical insulation
- Low stress on sensative componenants
- Unaffected by moisture at high temperatures
- Thermal cycling ability
- Hydrolytic stability
- No shrinkage
• Sealed switch, LED, trim pots, push button and
microphone connections
• All wires are hand soldered
• Mylar speaker with special weather-proof boot
• Field adjustable trim pots and DIP switches
• Closed cell foam gasketing to prevent water penetration
• Weatherproof connectors filled with anti-corosive sealing gel
P h o n e . . . 7 1 5 . 3 8 6
P h o n e . . . 7 1 5 . 3 8 6
S
S
C O M O L U T I O N S
C O M O L U T I O N S
on Selected Viking Products
. 8 8 6 1
. 8 8 6 1
N
N
2 1 C
2 1 C
F O R T H E S T
F O R T H E S T
Standard practice for manufacturing emergency phones is to provide them
with standard uncoated circuit boards (like the ones in your PC). A few man-
ufacturers, including Viking, spray the circuit boards with a water resistant
material such as acrylic conformed coating to protect them.
Some emergency phone applications demand extra protection. Phones that
are mounted outside exposed to the elements in salty air near the ocean, in
high humidity, exposed to a corrosive atmosphere or vehicle exhaust all
need an extra measure of weather and corrosion resistance.
Our EWP (Enhanced Weather Protection) phones are designed with total
reliability in mind. First,
we use weather-sealed
push button switches, trim
pots and DIP switches so
A p p l i
A p p l
• Exposure to harsh elements (outdoor emergency phones)
• Exposure to a salty atmoshere near the ocean (beach, board-
walk or lifeguard emergency phones)
• High-humidity environments (tropical environments and areas
where it gets very hot and humid)
• Corrosive-atmosphere environments
• High-pollution environments
• High-vehicle exhaust environments (roadside assistance and
emergency phones)
Model
BLK-3-EWP
E-10/20A-EWP
E-1600A-EWP
E-1600-03A-EWP
E-1600-20A-EWP
E-1600-45A-EWP
E-1600-50A-EWP
E-1600-52A-EWP
E-1600-55A-EWP
E-1600A-BLT-EWP
E-30-EWP
K-1700-3-EWP
W-1000/2000A-EWP
W-3000-EWP
Enhanced Weather
o t e
o t e
Protection
March 3, 2004
E N T U R Y
E N T U R Y
c a t i o n s
i c a t i o n s
Fax Back # Description
653
Line Status Strobe Light Kit
210
Speaker Phones
215
ADA Compliant Handsfree Emergency Phone
215
ADA Compliant Handsfree Emergency Phone
215
ADA Compliant Handsfree Emergency Phone
215
ADA Compliant Handsfree Emergency Phone
215
ADA Compliant Emergency Phone Kit
215
ADA Compliant Emergency Phone Kit
215
Univeral Emergency Phone Kit
217
Emergency Tower Phone with Strobe Light
212
Stainless Steel Handsfree Phone
157
Stainless Steel Handsfree Phone with Keypad
170
Handsfree Doorboxes
180
Vandal-Resistant Stainless Steel Doorbox
EWP
EWP