306-235820-001March 2001
AlarmLine™ Addressable Linear Heat Detector
1-4 Modules
The Addressable AlarmLine Module is available using
the following part number:
• 73-100001-001
AAM with operating temperature of -40° F to
140° F mounted on a 4” square face plate.
Table 2. AAM Specifications
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1-5 System Operation
A change in temperature produces a change in resis-
tance between the loops within the sensor cable (as the
temperature increases, resistance decreases). This
change is continuously monitored by the AAM, which
generates an alarm or pre-alarm signal at a predeter-
mined level corresponding to 50% and 70% of the sen-
sor cable's analog signal, taking into consideration the
portion of cable length brought to temperature.
The temperature at which the system will alarm is de-
termined by selecting one of 16 configuration settings
using the control panel’s configuration software or CCM
menu options. This setpoint will only cause an alarm if
the entire length of sensor cable is heated to the prede-
termined temperature. Smaller lengths of sensor cable
being heated, will require a higher temperature before
causing an alarm. See Figure 3b.
The appropriate configuration setting for a given set
point is established by the use of a nomogram incor-
porating two known factors:
• Maximum ambient temperature of the alarm zone
• Length of the sensor cable.
The integrating (averaging) effect of the sensor cable
allows it to detect a localized hot spot or a low level
temperature increase over its entire length. A major
advantage of the AlarmLine sensor cable is that it self
restores when temperature drops below its set point,
provided it has not been heated to a temperature
point above 257° F (125° C). Above this temperature,
the sensor will remain permanently in an alarm condi-
tion.
1-6 Indicators
A single LED indicator is mounted on the front cover
of the AAM and indicates the four possible states of the
detector by pulsing in the following ways.
• Normal. Slow green flash every nine seconds.
• Trouble. No flash.
• Pre-Alarm. Slow red flash every nine seconds.
• Alarm. Fast red flash every two seconds.
2 SYSTEM DESIGN
2-1 Sensor Cable Selection
One of the most important steps in designing an Alarm-
Line system is selection of the sensor cable. Environ-
mental conditions and project risks play major parts
in choosing the right cable. The three available cable
types are described below.
•Standard Sensor Cable
73-117068-013
Recommended for environments ranging from
clean and dry to moderate dust and moisture.
Ambient temperature: 0° F (-17° C) to 212° F
(100° C).
•Nylon Coated Sensor
73-117068-016
Recommended for use in wet, oily or corrosive envi-
ronments or outdoors. Use in freezer warehouses.
Ambient temperature: -40° F (-40° C) to 212° F
(100° C).
•Phosphor Bronze Braided Sensor
73-117068-019
Recommended for applications requiring superior
abrasion protection or increased tensile strength.
Ambient temperature: -40° F (-40° C) to 212° F
(100° C).
2-2 Setting Alarm Temperature
When determining the alarm temperature setting, the
designer must take into account environmental factors
that may affect the overall response of the system. By
accounting for these factors, the designer minimizes
unwanted alarms. Below is a step by step procedure
which instructs the designer in selection of the proper
alarm trip points.
The required alarm temperature and the correct alarm
configuration setting for the AAM are determined using
the AlarmLine nomogram(s). The nomograms can be
found in Appendices A and B for Type “T” cable.
Measurements are in Feet/Fahrenheit or Meters/Centi-
grade.
