We use chart recorders and humidifiers year round to maintain RH between 40
and 50 percent. In our building, in this climate there does not seem to be a
season where we need to dehumidify.


At one of my previous employs there were occasions when we needed to
dehumidify and other seasons when we needed to humidify. Initially, we had
no control, then we installed good equipment to control temperature and
humidity.

Our insertion and placement equipment performed measurably better.

We saw a measurable improvement in first pass yields at ICT. With fewer
unexplained failures in J-FET op amps, DACs, and small signal MOSFETS.

We saw less process variation, fewer process indicators like blow holes and
pin holes, at the solder wave. We were able to extend the time between
change out of the foam fluxer.

We had fewer problems controlling performance of the vapor cleaners.


-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Tony Gasso
Sent: Tuesday, March 07, 2006 3:56 PM
To: [log in to unmask]
Subject: [TN] Positive Pressure


Recently a customer has requested we comply to paragraph 3.6.1 to maintain
positive presure in our facility during soldering operations, for
terminals, wire preping, limited radial components and PCBA's per J-STD-001C

We have an open assemlby area of about 10,000 Sq. Ft., lowered 12' drop
ceilings, and AC but internal doors remain open to both the fabrication
area as well as to the parking lots outside. Other than placing chart
recorders to monitor pressure, temp. and himidity, does anyone else have
similar problems with maintaining environmental controls in your facility
and have you had any positive results with your controls?

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