TrueAlarm® analog sensing provides:
• Digital transmission of analog sensor values via
IDNet™ or MAPNET II
® two-wire communications* *
For use with the following Simplex® products:
• 4010 and 4100U Series control panels; and 4008 Series
control panels with reduced feature set ( refer to data
sheet S4008-0001 for details)
• 4020, 4100, and 4120 Series control panels, Universal
Transponders and 2120 TrueAlarm CDTs equipped for
MAPNET II operation
Fire alarm control panel provides:
• Peak value logging allowing accurate analysis of each
sensor for individual sensitivity selection
• Sensitivity monitoring satisfying NFPA 72® sensitivity
testing requirements; automatic individual sensor
calibration check verifies sensor integrity
• Automatic environmental compensation, multi-stage
alarm operation, and display of sensitivity directly in
percent per foot
• Ability to display and print detailed sensor information
in plain English language
Ionization smoke sensors provide:
• Three levels of sensitivity; 0.5% , 0.9% , and 1.3%
4098-9717 Ionization Sensor
TrueAlarm Ionization sensors use a single radioactive source with an outer sampling ionization chamber and an inner reference ionization chamber to provide stable operation under fluctuations in nvironmental conditions such as temperature and humidity. Smoke and invisible combustion gases can freely penetrate the outer chamber. With both chambers ionized by a small radioactive source [ Am 241 ( Americium) ] , a very small current flows in the circuit. The presence of particles of combustion will cause a change in the voltage ratio between chambers. This difference is measured by the electronics in the sensor base and digitally transmitted back to the control panel for processing. Three levels of sensitivity are available for each ionization sensor: 0.5, 0.9, and 1.3% per foot of smoke obscuration.
• UL listed to Standard 268
• Louvered smoke sensor design enhances smoke capture by directing flow to chamber; entrance areas are minimally visible when ceiling mounted
• Designed for EMI compatibility
• Magnetic test feature is provided
• Optional accessories include remote LED alarm indicator and output relays
Digital Communication of Analog Sensing.
TrueAlarm analog sensors provide an analog measurement digitally communicated to the host control
panel using Simplex addressable communications. At the control panel, the data is analyzed and an average value is determined and stored. An alarm or other abnormal condition is determined by comparing the sensor’ s present
value against its average value and time.
Intelligent Data Evaluation.
Monitoring each sensor’ s average value provides a continuously shifting reference
point. This software filtering process compensates for environmental factors ( dust, dirt, etc.) and component aging, providing an accurate reference for evaluating new activity. With this filtering, there is a significant reduction
in the probability of false or nuisance alarms caused by shifts in sensitivity, either up or down.
Control Panel Selection.
Peak activity per sensor is stored to assist in evaluating specific locations. The alarm
set point for each TrueAlarm sensor is determined at the host control panel, selectable as more or less sensitive as
the individual application requires.
Timed/ Multi-Stage Selection.
Sensor alarm set points can be programmed for timed automatic sensitivity selection ( such as more sensitive at night, less sensitive
during day) . Control panel programming can also provide multi-stage operation per sensor. For example, a 0.2%
level may cause a warning to prompt investigation while a 2.5% level may initiate an alarm. Sensor Alarm and Trouble LED Indication. Each sensor base’ s LED pulses to indicate communications with the panel. If the control panel determines a sensor is in alarm, or is dirty or has some other type of trouble, the
details are annunciated at the control panel and that sensor
base’ s LED will be turned on steadily. During a system alarm, the control panel will control the LEDs such that an LED indicating a trouble will return to pulsing to help identify the alarmed sensors.