Linear DXS-80, Manual

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SECTION 3
LINEAR LLC
FCC ID: EF4 SST00116
2.4 LOW BATTERY LOAD
The low battery test load is a constant current source designed to simulate the
current draw of the entire detector in alarm. The circuit’s current consumption is
independent of the battery voltage. This circuit is activated by the microcontroller
at power up and before each status update every 65 minutes. Once active the
microcontroller will perform an ADC measurement on an internal voltage
reference in order to determine the battery voltage.
2.5 TEST
SWITCH
The test switch is a mechanical switch that pulls an interrupt enabled port of the
microcontroller low. The microcontroller filters the signal on this port to verify that
the interrupt signal is not caused by noise.
2.6 PIEZO
DRIVER
The piezo driver circuit is used to oscillate the piezo. The circuit uses a hex
inverter to drive the piezo in a self-resonant mode. The microcontroller turns the
circuit on and off to generate the UL2034/UL2075 temporal tone.
2.7 MECHANICAL
The detector base design allows for access to the battery without removing the
housing. The housing provides an opening for the visual LED indicators and to
depress the test switch.
2.8 MOUNTING
The sensor attaches directly to a mounting base. The mounting base provides
mounting slots for single gang, 3-1/2” and 4-1/2” octagon back boxes, if
applicable. Two each mounting screws and plastic anchors are supplied.
2.9 GENERAL
SPECIFICATIONS
Color Off White
Finish Lightly Textured
Dimensions Diameter 5.3” Height 2.0” including mounting base.
Regulatory UL 2075
3.0
CO DETECTOR OPERATION
3.1 SENSING ELEMENT
The W3-CO is a carbon monoxide detector based on an electrochemical gas cell
that converts a CO concentration in the ambient air to a direct current. The cell is
sampled approximately every 10 seconds and automatically checked for a
trouble condition. The electrochemical gas cell is not user serviceable, and
cannot be replaced; at the end of its useful life the entire unit must be replaced.
The gas cell cannot be electrically supervised for sensitivity.
3.2 SENSITIVITY
UL 2075 / UL 2034 Compliant.