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  1. jlinstrom

    DI water corrosion of electronic components?

    we recently purchased a TDS/EC meter and will use it for weekly water quality audits (the Culligan man is called to replenish the 'magic beads'). twodogs SUNSPOT Svcs.
  2. jlinstrom

    DI water corrosion of electronic components?

    sample results back from the lab: sodium, calcium, magnesium and potassium carbonates, sulfates, nitrates and silicates - your basic hard well water (which we use). Humidifiers were using R.O. from day one (not DI as first supposed) and all process water is DI - except the floor mopping water...
  3. jlinstrom

    DI water corrosion of electronic components?

    we monitor the temp and humidity , samples every 10 minutes or so. During the P/S failures, temps were 63-77 and RH was 58-33. HVAC is 24/7. I checked and humidifier water is R.O. not D.I. White dust is NOT on everything, just the DC side BUT this includes the insulation on the DC wires. Areas...
  4. jlinstrom

    DI water corrosion of electronic components?

    moltenmetal - good thought, but all pipes, fittings, etc. are plastic. Also, what do you think my 'hoarfrost' is? Is it corrosion of the solder on the pcbs (I don't know if they are RHOS)? Why would it preferrentially be on the low voltage DC side? The power supplies affected are from a few...
  5. jlinstrom

    DI water corrosion of electronic components?

    so, an ultrasonic throws up whatever is in the tank and after water evaporates, the other stuff is left as dust. If I use RO water, what might be in this dust? - calcium, magnesium? If I use water soften. what is replacement - sodium? Is this a worse dust on electronics? How about if I use...
  6. jlinstrom

    DI water corrosion of electronic components?

    I'm puzzled (twice). Does humidifier water eject anything else besides pure water into the air (it's ultrasonic)? I understand about the residual crust (we have none in the humidifiers). How different would things be if we used 'softened' water? We need to keep above 30%RH for ESD purposes and...
  7. jlinstrom

    DI water corrosion of electronic components?

    I failed to add - the water goes thru RO (reverse osmosis) before the DI. We never saw this failure in 4 yrs. I've been here until humidifiers got fixed: no new food in area rules, no new floor wax, spill events, paint jobs. In other words, no new dust episodes, just a proximate humidifier that...
  8. jlinstrom

    DI water corrosion of electronic components?

    We use ultrasonic humidifiers with DI water to maintain proper humidity to suppress ESD in an electronic assembly area. We have fried 4 power supplies in 5 months on our SMT assembly machines. We have a very troublesome buildup of contamination in all pick&place machines that we think is...

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