In my experience, temperature and humidity requirements are a function of
the Equipment Requirements, ESD Control, and personnel needs.

The temperatures and relative humidity you mentioned is consistent with the
practices I have observed for Equipment Requirements and ESD Control (30% -
70% RH).

However, operators have been known to complain when the temperature is
outside of those ranges (I'm cold blooded myself, so cold temperatures do
not effect me too much). Of course, this creates chaos with your building's
HVAC.

This raises an important point though about HVAC. If you put in production
or test equipment that runs very hot or requires additional cooling, this
may ruin the HVAC within your work center. This may require the installation
of additional HVAC systems  (temporary or permanent) within the workcenter.
This is not a trivial problem. I once had to install a portable AC unit to
keep some test equipment cool in an area that was very warm and humid. The
result of the additional cooling was that it "rained" on various locations
within the workcenter since the lower temperature and excessive humidity
caused condensation to occur.

The best way to avoid this is to determine how much heat each piece of
equipment is putting out, and have your Facilities people determine the
amount of cooling and air changes / hour (ventilation) that is required to
maintain a specific temperature. That will tell you the size of the HVAC
system needed to meet your requirements.

Lee Whiteman
Senior Manufacturing Engineer
ACI / EMPF
Telephone: (610) 362-1200; Ext. 208
FAX: (610) 362-1290
E-Mail: [log in to unmask] <mailto:[log in to unmask]>


> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]]On Behalf Of Stephen R. Gregory
> Sent: Monday, July 10, 2000 1:28 PM
> To: [log in to unmask]
> Subject: [TN] Manufacturing Floor Temperature...
>
>
> Hi ya'll!!
>
> Seeing how summer is here (boy is it ever here in the midwest!!),
> what is the
> maximum temperature you would not exceed on the floor? I know the
> J-STD-001C
> calls out that the temperature should be maintained between 18-30
> C. (64.4-80
> F.), and the humidity should not exceed 70%. Our Philips equipment manual
> says that they should not be operated if the temperature exceeds
> 86 F. What
> about the test equipment or any other automation?
>
> -Steve Gregory-
>
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