Assertion: detector | /r/HasProperty | operative
Facets:
value: often
type: TEMPORAL
Source sentences:
text: Portable detectors should be regularly bump tested with a calibrated test gas to ensure that the sensors are still operative.
text: Detectors like this are often battery operated.
text: Of course, it is essential that the detector is operational: Approximately 95% of U.S. homes have at least one smoke detector, yet 20 percent of fire fatalities occur in homes with broken or disabled detectors.