July 2016 -7- K-76-1000
FEATURES
•Addressing: DS Series detectors feature electronic addressing. No addressing switches are
used.
•LEDs: DS Series detectors use an LED to indicate the detector’s condition. In normal con-
dition, a flashing green LED indicates that the control panel is performing back-
ground supervision and a flashing red LED indicates an alarm condition.
•Sensitivity:The alarm sensitivity is the minimum obscuration level at which the detector initiates
an alarm condition and can be specified via the control unit menus or the remote
configuration software. The control unit to which these detectors are connected is
capable of interrogating each detector to determine its sensitivity.The table below
lists the acceptable smoke and heat ranges of sensitivity for the DS-PS and DS-
HFS detectors:
•Protocol: DS Series detectors operate on a Kidde Fire Systems fire alarm-suppression
control unit (Kidde, Fenwal and Chemetron brands) employing SmartOne®
communications protocol and can be mixed in any order with SmartOne legacy
detectors.
SPACING AND LOCATION
This section discusses the parameters for the spacing and location of DS Series smoke and heat
detectors. To better understand the requirements, use the following definitions:
Beams — are solid structures that project down from the ceiling surface more than 4 in. (100 mm) and are
spaced at intervals of more than 36 in. (910 mm), center-to-center.
Ceiling — is the upper surface of a space, regardless of the height. Consider a ceiling:
• Smooth, if it is uninterrupted by continuous projections, such as solid joists, beams, or ducts that ex-
tend more than 4 in. (100 mm) below the ceiling surface.
• Level, if it has a slope of less than or equal to 1 in 8.
• Sloping, if it has a slope of more than 1 in 8.
• Sloping peaked-type, if the ceiling slopes in two directions from the highest point. Consider curved or
domed ceilings as a peaked ceiling, with the slope figured as the slope of the chord from highest to
lowest point. .
• Sloping shed-type, if the high point is at one side with the slope extending toward the opposite side..
Ceiling Height — is the height from the floor to the ceiling of a room or space.
Design spacing — the spacing required for a particular installation.
Listed spacing — the spacing for which a heat detector is rated.
Partitions — walls extending from the floor toward the ceiling. If they are within 15% of the ceiling,
consider the space separated by the partitions as separate rooms.
Solid joists — are solid structures that project down from the ceiling surface more than 4 in. (100 mm)
and are spaced at intervals of 36 in. (910 mm) or less, center-to-center. Consider solid joists equivalent to
beams for smoke detector spacing guidelines.
Table 1. Acceptable Sensitivity Ranges for DS Series Detectors as Reported by Control Unit
Model Detection elements Factory-assigned
sensitivity
Adjustable alarm point
setting (%obsc./ft.)
DS-PS Photoelectric (open air) 2.0% obsc./ft. 0.9 to 3.5% obsc./ft.
DS-PS Photoelectric (in-duct) 2.0% obsc./ft. 0.9 to 2.0% obsc./ft.
DS-HFS Fixed-temperature 135°F (57°C) fixed 135°F (57°C)
