Figure 8-30.A solid, circular beam of microwave energy extends from a transmitter to the receiver
over a range of up to 1,500 feet (457 m).
Figure 8-31.Structure of a heat-sensor cable.
channels of the dialer permit two distinct dialing and
message programs. Although labeled as, and most
commonly used for, separate burglar and fire alarms the
two channels can be connected and programmed for any
application: medical emergency, heating-system
failure, freezer warmup, and water-pressure failure.
It is important to understand the priority
relationship between the two channels before making
trigger connections. The priority arrangement ensures
Figure 8-32.Curve showing relationship of resistance to
transmission of the vital fire-alarm program (or other
priority program on the FIRE channel) in three ways.
1. If the dialer is already operating on the
BURGLAR channel when the FIRE channel is
triggered. the dialer immediately switches to FIRE-