Parts Per Million
Detector response time, min.
70 ±5ppm
60-240
150 ±5ppm
10-50
400 ±10ppm
4-15
FIGURE 5. SENSOR ASSEMBLY:
Also young children and pets may be the first to be affected.
Per UL standard 2075, the SD355CO has been tested to the sensitivity limits
defined in UL standard 2034.
ALARM THRESHOLDS ARE AS FOLLOWS:
What to do if the carbon monoxide detector goes into alarm:
Immediately move to a spot where fresh air is available, preferably outdoors.
IMPORTANT: This detector should be tested and maintained regularly follow-
ing National Fire Protection Association (NFPA) 720 requirements.
CLEANING
Before removing the detector, notify the proper authorities that the smoke
detector system is undergoing maintenance and will be temporarily out of
service. Disable the zone or system undergoing maintenance to prevent un-
wanted alarms.
1. Remove the sensor to be cleaned from the system.
2. Remove the sensor cover. Use a small flat blade screwdriver to gently re-
lease each of the four cover removal tabs that hold the cover place. Use
caution to avoid damaging the thermistors and other sensors (see Figure 5).
3. Carefully vacuum the outside of the anti insect screen without removing
it from the detector cover.
4. The chamber cover, CO and IR sensors may be removed as a single as-
sembly. Gently pull the assembly away from the sensing chamber being
careful neither to damage the thermistors, the IR / CO sensor PCB nor to
strain the connector cable to the PCB, then gently folded away from the
optical chamber.
5. Use a vacuum cleaner and/or clean compressed air to remove dust and
debris from the sensing chamber and sensing chamber cover.
6. Re-install the sensing chamber cover assembly by sliding the cover over
the chamber, gently pressing it home until it snaps into place.
7. Re-install the sensor cover. Use the cover removal tabs, LEDs and therm-
istors to align the cover with the sensor. Snap the cover into place.
8. When all sensors have been cleaned and re-installed, restore power to
the loop and test the sensor(s) as described under TESTING.
After completion of maintenance and testing, notify the proper authorities
that the system is operational.
CO SENSOR LIFETIME
The CO cell has an expected lifetime of approximately six years. The detec-
tor is programmed to signal the approach of end of this lifetime to the con-
trol panel. The CO cell is not a field replaceable component and on failure,
you should contact the system supplier to arrange for replacement of the cell.
The smoke sensor will continue to operate using the photoelectric sensing
chamber, thermal and infra-red sensors even though the CO cell is no longer
operational. The CO detector will not operate once the CO cell has reached
its end of life.
SPECIAL NOTE REGARDING SMOKE DETECTOR GUARDS
Smoke detectors are not to be used with detector guards unless the combina-
tion has been evaluated and found suitable for that purpose.
SENSOR COVER
COVER
REMOVAL
TABS
THERMISTORS
DETECTOR BASE
IR
SENSOR
CO
SENSOR
OPTICAL
CHAMBER
COVER
OPTICAL
CHAMBER
BASE
C0952-00
FL-400-006 3 I56-4129-000
Many causes of reported carbon monoxide poisoning indicate that while vic-
tims are aware that they are not well, they become so disoriented that they
are unable to save themselves by either exiting the building or calling for
assistance.
