Hey, I'm hip with static. But there has to be a static charge built up to begin to create this dilemma, then there has to be a discharge across the circuit for damage to occur. I don't think sucking debris out of the hole the sensor sits in is going to cause a static charge, and if it does, I believe the tube will immediately ground out to the concrete, effectively not allowing the charge to build up in the first place. So I guess my position is that you'd be hard pressed to create a residual static charge in the sensor.
Now, proving that it will never happen is nearly impossible because you'd need to test countless scenarios and prove each individual parameter provides indicative results. Whereas proving the potential for static charge retention would be rather simple by holding a probe in your hand and rubbing it with rabbit's fur, then discharging the static to a grounded object. This doesn't prove it could happen in the concrete though!
Now imagine being there on the job site, your back turned to a group of burley construction workers, stroking your Wagner probe with a soft fur pelt, elbows flying around, and suddenly you spasm as the electrical charge is released and you shout "YES YES!!! I DID IT!"
NOT a good way to start off on the right foot at a job site... Maybe you should just have faith that it's not an issue...