United have potential fan problems...(had to stop Dewey), but in that case,
50% RH isn't enough, but you need pressurised water...
OK, serious now...we have installed several personal blowers and we found no
rising electrostatic fields. To be sure, the blowers are sprayed with
antistatics, because the plastic envelope could charge up to several hundred
volts! So, your question is relevant! Another issue: we had to place ESD
mats on the painted wooden shelves, because the varnish charged. And keep an
eye on the wooden doors, if you got such. Wood and painted wood should be
banned, but it's impractical.
Inge
----- Original Message -----
From: "Brian Ellis" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, March 13, 2007 10:39 AM
Subject: Re: [TN] ESD control and fans
> If the fan blades are in grounded bare metal, I don't think a problem
> would occur, provided that the RH is maintained at 50% or more. If the fan
> blades are plastic or are plasticised (including paint), then I could
> foresee a potential problem (pun intended, to stop Dewey from
> intervening!). However, like all ESD questions, have you ***measured***
> the results? Anyone can say anything and be right or wrong. Only
> measurements can justify any measure you take.
>
> In any case, would not suitable airconditioning be a better solution?
>
> Brian
>
> Joel Alexander wrote:
>> Has anyone had any experience assessing if personal fans could have an
>> adverse effect on an ESD control program. We have ionizers on our
>> compressed air sources used to clean or dry assemblies but we have no
>> such policy for fans. We just transitions to lab coats with 13%
>> carbonized nylon. Our policy when sitting is to wear a wrist strap that
>> is tied into an approved ground or have the wrist strap connected to a
>> shirt sleeve and your pocket button attached to an approved ground. Many
>> employees complain that they are hot and I can see a lot more fans being
>> used. Joel Alexander
>> Quality Assurance Manager
>> TT APSCO, INC. ---------------------------------------------------
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