
...and the SENSOR apparatus will rest on it.
The Big Bang Theory Season 1, Episode 12

HOWARD:
Told you the SENSOR would work.
The Big Bang Theory Season 1, Episode 11

This is a sub-sonic impact SENSOR.
The Big Bang Theory Season 1, Episode 11

All right, you're close enough
to Sheldon's room. Deploy the SENSOR.
The Big Bang Theory Season 1, Episode 11

to activate the motion SENSOR.
The Big Bang Theory Season 5, Episode 2