OrbitMotion-Activated Sprinkler

Q: Are the electronics isolated well enough that the unit can withstand a bit of dew in the morning? Will humid environments harm the sensor?

These last few mornings we have had a very heavy dew here - in fact two days ago even a frost. The one thing I noticed is that it takes more light in this situation for it to think that it is "day" and so it is likely to spray even if it is past dawn. Perhaps the sensor gets a little obstructed by the dew ? But other than that it seems to be working fine.