In order to assess the usefulness of the measured RTI values in real field
applications, full-scale fire tests were conducted. Seven detector samples that were
randomly chosen from the seven types of the restorable detectors used in the benchscale
tests were installed on a ceiling in such a way that they can maintain the same
radial distance from a test fire source. A 0.76-m-diameter heptane pan fire under a
3.0-m high ceiling was used as the fire source.