Seven restorable detectors and a sprinkler were mounted on the ceiling. They were
arranged in such a way that each detector could maintain an approximately 3.4-m
radial distance from the center-axis of the plume that was generated by a 0.76-mdiameter-
heptane-pan fire, as shown in Fig. 21. The dimensions of the test room were
18.3m by 12.2m by 4.6m high. The detectors and the instruments attached on the
ceiling were: velocity probe 1, detectors A–G, velocity probe 2, and a sprinkler,
respectively, from left to right in the figure, approximately 0.15m apart each other.
The pan was placed on a 1.6-m high platform, so that the ceiling clearance from the
pan was 3.0 m. Temperatures and velocities of the ceiling jet flows from the fire
plume were measured by the two velocity probes, which were equipped with pressure
transducers and thermocouples. Fig. 22 shows a comparison of the measured and the
computed response time of each detector and the sprinkler, which is represented as
Type S in the figure. The comparison of the detector response times showed the
following: