Dessicants and Dew Points

Suggest going for refrigerant drier. For details pl contact purna.design@gmail.com

You report two independent problems. The first problem is electrostatic charging of your ICS by the use of dry air for temperature control. The second problem is how to dry the air most efficiently. The best molecular seive dessicant can be suggested by the manufacturer of the seive material. The charging problem is more difficult. I suspect you need an air ionizer to dissipate the static charge before it reaches the semiconductors. You also need to be sure that the conductive trays that hold the parts are properly grounded. I have seen testing systems where the semiconductors were charged to high voltage by industrial processes. The high voltage charge does not necessarily damage the device because the voltage gradients are small. The damage occurs when the tray of charged parts is subsequently placed on a grounded surface. Then-poof!!!

I agree. you have two problems. I cannot answer the static problem, but can answer the drying concern.

First, a refrigerated dryer will not get you down to the pressure dewpoint you are seeking. The dessicant dryer is the thing to use. A 4A Molecular sieve, alkali alumino-silicate, will get you down to about a -84.4 deg c pressure dewpoint. To get there you will need to use this dessicant and adjust the cycle time of the two towers for the dewpoint you want. This is done in the control box/panel of your dryer. You will need to read the manual for your particular dryer to see how to make the adjustment. Each manufacturer has their own proceedure.