Well, the sensor only worked within a certain distance from the timegate.

"If we run with full shields, the sensors won't work at all."

It was as if she didn't care how well the sensors worked.

I don't care how you do it, but make the sensors work!

Clearly, the Beast's sensors, to a limited degree, were still working.

But the sensor in this case was working with an unexpected set of circumstances.

"I want to see if the back sensors are working."

In any case, I doubt a sensor would work for a possessed.

If the sensors work exactly like we think they will, then we'll launch on that day.

With all the sensors working in this area, someone else may have picked up something.