roger
-----Original Message-----
From: David Douthit [mailto:[log in to unmask]]
Sent: den 20 augusti 2007 21:49
To: TechNet E-Mail Forum; Hernefjord Ingemar
Subject: Re: [TN] PCB assembly protection for outdoor working under
harsh environmental conditions
Inge,
Thanks for the plug!
D. A. Douthit
Manager
LoCan LLC
On Aug 19, 2007, at 11:49 PM, Hernefjord Ingemar wrote:
> I have never seen such a exacting and extensive question before! I
> think there are a lot of ways of protecting electronics. Ventilation
> fans, drip holes, getters, oils, paintings, various finishes, Faraday
> cages, circulating gases, exhaust systems, vacuum, overpressure,
> heaters, dust filters, deionizers, ESD material, EMC material,
> moisture absorbers, a number of enclosures and cabinets, moldings,
> pottings, antistatics, metallic gaskets, polymeric gaskets etc,
> radiation protection etc. I'm curious about others's answers. One
> example: mobile radar station.
> Multistage filters for air inlet, slight overpressure to stop dust
> coming into rack system, all cabinet doors have silicon rubber
> gaskets, extensive ESD protection system, everything grounded, all
> boards coated, overpressure in the wave guides, automatic systems for
> taking care of condensed water, air condition, lightning protection,
> surge supressors, carefully designed condense drainage, careful
> selection of metals to avoid galvanic corrosion and a lot more,
> special paint for minimum IR absorption etc.
>
> A good start is to buy David A. Douthit's book 'Contamination of
> Electronic Assemblies' CRC Press ISBN 0-8493-1483-6. Understanding the
> environmental issues is probably best way to begin with.
>
> Inge
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Reyes, Angel LAM2
> 4429
> Sent: den 18 augusti 2007 01:15
> To: [log in to unmask]
> Subject: Re: [TN] PCB assembly protection for outdoor working under
> harsh environmental conditions
>
>
> Blair thanks for the info.
>
> Have anyone information what protection is used on PCB assemblies for
> industries with electronic outdoor products like avionics, SPA
> controllers, Telecom, lighting advertisements, etc.
>
> Best regards,
> Angel
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Hogg, Blair K.
> Sent: Friday, August 17, 2007 1:01 PM
> To: [log in to unmask]
> Subject: Re: [TN] PCB assembly protection for outdoor working under
> harsh environmental conditions
>
> Conformal coating with proper cleaning helps. Moisture will migrate
> through the coating, so it is important to get any ionic contamination
> off the board before coating.
>
> Good design practices including maintaining enough spacing between
> conductors of different voltage potential.
>
> Potting might be something you find in under hood automotive
> applications, or more sever environments.
>
> Outdoor locations will typically give condensation due to the diurnal
> temperature cycling. Hopefully any outdoor electronics will not be
> directly exposed to the weather.
>
> Blair Hogg
> GAI-Tronics Corporation
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Reyes, Angel LAM2
> 4429
> Sent: Friday, August 17, 2007 2:32 PM
> To: [log in to unmask]
> Subject: [TN] PCB assembly protection for outdoor working under harsh
> environmental conditions
>
> Could I have examples of what PCB assembly protection (perhaps
> conformal
> coating) is used for products to be used in outdoor (Stop lights,
> Automobile, etc) under harsh environmental conditions
>
> Angel Reyes
> Principal Engineer
> Rain Bird Corp./controls Mfg. Div
> 9491 Ridgehaven Ct
> San Diego Ca. 92123
> Ph:(619) 661 4429
>
>
>
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