2.8 The Microphone
The Model 1104 is provided with a built-in microphone which is
used to monitor high sound levels produced near the installation
site. The sensitivity of the microphone is configurable and will
detect a continuous as well as a beeping alarm.
Other programming options that apply to the microphone include
setting the length of time before a high sound causes an alarm.
If this sound level exists for 8 consecutive seconds (default) or for
the programmed length of time, the Model 1104 will dial out with
an alarm message.
NOTE
The proximity of the audible alarm to the microphone
is extremely important.
Normally, the Model 1104 and the audible alarm must be in the
same room. The maximum distance can vary considerably
depending on the alarm, the acoustics, and the size of the room.
During an alarm dial-out, the microphone allows four-second
intervals to listen-in to sounds at the Model 1104’s location.
When calling for a Status Report, the microphone permits
listening to on-site sounds for a programmed time interval.
2.9 Alert Inputs
The Model 1104 can monitor up to 4 inputs (represented by the
numbered terminal screws shown in Figure 2-5, below).
Figure 2-5. Alert Inputs
Inputs are configured as either dry contact or temperature. An
input configured as dry contact can be used with any normally
open (N.O.) or normally closed (N.C.) device. “Open” refers to
an opened circuit path; if conditions cause the circuit to close, an
alert condition occurs. “Closed” refers to a continuous circuit
path; if a closed circuit is opened, an alert condition occurs. The
Model 1104 determines the way inputs are configured by the type
2341
GND GND GNDGND
Chapter 2:Installation
19