OVERVIEW
DETECTION PATTERNS
OS-551/551T
INSTALLATION INSTRUCTIONS
APPLICATION NOTES
PIR sensor is more sensitive to the movements
“crossing” the detection zones than “toward” or
“away” the sensor unit. Avoid placing the sensor in line
with the path of occupant, if possible.
PIR sensor cannot “see” the movements behind
obstacles, such as furniture, shelf, glass or partitions.
As a general rule, ensure to place the sensor at where
the occupant could have clear view of the sensor.
For open office areas with partition which could
block the sensor view to occupant movements,
it is recommended to place the sensors over the
intersection of multiple workstations. For large areas
of open office or space, place multiple sensors so that
there is overlap coverage with each adjacent sensor.
1.
2.
3.
DIMENSIONS
The OS-551/OS-551T is a low voltage occupancy
sensor designed to signal the occupancy status for
area lighting, or HVAC control, for energy efficient
building management. The sensor is operated by
24VAC/DC power supply from an IR-TEC power pack,
or building management system, and provides a dry
contact signal for control of the connected lighting or
HVAC equipment.
A cutting edge dual element pyroelectric infrared
sensor and unique Fresnel lens are employed to
provide superior occupancy sensing capability. When
the sensor detects an occupant’s presence, the relay
contact output will be engaged until the OFF-delay
time expires. If the sensor is applied to control the
operation of HVAC systems, the ON-delay can be
enabled to prohibit short-cycle restarting or unwanted
load activation. Both ON and OFF delays can be
easily set through jumper pin positioning.
In addition to the standard features of OS-551, the
OS-551T further provides high/low temperature
setbacks to help maintaining room temperature
within the range during unoccupied period. The
sensor comes with a multi-directional bracket for easy
mounting on the ceiling or wall, which also allows
horizontal/vertical sensor angle adjustment to achieve
optimal coverage.
Top View
Side View
8’
8’ 25’ 50’
110°
SPECIFICATIONS
Power supply
Current drain
Output contact
Infrared sensor
Detectable speed
Mounting height
Detection range
ON delay setting
OFF delay setting
High/low setback*
Op. humidity
Op. temperature
Dimensions
24 ± 2 VAC/DC
7 mA @24VAC
Form C, Max. 30 VDC, 0.2A
Dual element pyroelectric infrared sensor
0.33 ~ 10 ft/sec. (0.1 ~ 3 m/sec.)
6 ~ 12 ft. (1.8 ~ 3.6 m)
110°, 50 ft @ 77°F (25°C)
0(disabled)/10”/30”/1’/5’/10’ selectable
10”/1’/5’/10’/20’/30’ selectable
High: 85/82/79°F, Low: 59/55/51°F
Max. 95% RH
-4°F ~ 122°F (-20°C ~ 50°C)
4.4” x 2.6” x 1.8” (112 x 66 x 45 mm)
*Only available on OS-551T
The sensor will enter a warm-up period when power is
first applied and then operate as described below.
SENSOR OPERATION
The sensor will enter into standby mode after the
warm-up period expires. The LED will flash if any
jumper is not properly placed on the pin.
A. Standby mode
If the ON-delay is enabled, the sensor will enter this
mode when it first detects the presence of an occupant.
Any further motion detected during the ON-delay
mode will NOT reset the timer.
B. ON delay mode
When the ON-delay expires, the sensor will enter into
the 1-minute waiting period. If no motion is detected
within this time period, the sensor will return to standby
mode. If motion is detected within this time period,
the sensor will engage the relay contact and enter into
OFF-delay mode.
C. 1-minute waiting
The OFF-delay is the time
period that the sensor
will hold its relay contact
engaged. Every motion
detected during this time
period will reset the timer. The
sensor will return to standby
mode if no further motion
is detected during this time
period and the relay will be
disengaged.
Note: The OS-551T will
activate its relay contact output
automatically when room
temperature exceeds the
high/low setback range when
controlling in an HVAC system.
D. OFF delay mode
Standby
mode
A.
Detection
Detection
No
Detection
ON delay
mode
B.
OFF delay
(Relay Output)
D.
1-minute
waiting
C.
4.4”
2.6”
1.8”
Low Voltage Occupancy Sensor
P/N: 058-55101-003 Printed in Taiwanwww.irtec.com
This product may be covered by one or more U.S. patents or patent applications.
Please visit www.irtec.com for more information.
Turn power OFF at circuit breaker before connecting
Power Pack or Sensor.
CAUTION
Wire all Class 2 circuits using types CL3, CL3P,
CL3R, or equivalent conductors.
INDOOR USE ONLY
Coupez l'alimentation au disjoncteur avant d'installer
Power Pack ou capteurs.
Câble toute classes 2 circuits CL3, CL39, CL3R ou
conducteur équivalent.
PRUDENCE
Utilisation a L'interieur Uniquement
Hot
Black
White
Red
Orange
Grey
Brown
Red
Neut
Relay
Relay
DC24V
GND
AC/DC
COM
NO
NC
Control
Manual
Hold ON
Hold OFF
Load
Momentary Button
Hot
120~277V
Neutral
Red
Black
Green
White
Red
Black
Blue
Brown
OS-551/
OS-551T
PPU-300
OS-551/
OS-551T
AC/DC
Hot
Black
White
Red
RedRed
Black
Green
White
Red
Neut
Relay
Relay
DC24V
GND
COM
NO
Control
Load
Hot
120~277V
Neutral
Black
Blue
NC
Brown
PPU-301
Delay A B C D E F
0 10” 30” 1’ 5’ 10’
10” 1’ 5’ 10’ 20’ 30’
ON
OFF
The OS-551/551T comes with the bracket assembled
which allows it to be mounted on wall or ceiling with
two screws. To achieve optimal coverage, sensor angle
can be adjusted horizontally or vertically by loosening
the tightening screw on the bracket. Ensure to tighten
the tightening screw to hold the sensor position.
It is recommended to conduct a walk test to verify
optimum coverage after sensor installed. To test the
sensor range, restore the front cover, apply the low
voltage power and wait approximately 60 seconds for
sensor to warm up. The LED will blink during warm-up
period. Walk into the projected area in the path of
occupant show up and observe if the sensor can
detect the presence. The LED will be lit whenever
sensor detects the motion. If the space has multiple
entrances, repeat the test in all available paths.
The detection range can be adjusted by changing the
sensor direction to suit for different space or area. To
adjust the sensor direction, slightly loosen the tighten
screw on the bracket and rotate the sensor unit
horizontally or vertically to achieve optimum detection
coverage.
Mount the bracket base to the mounting surface with
screws.
Drill a proper hole on the mounting surface to lead
the sensor wires through.
Refer to the wiring diagram and connect the sensor
wires to the power pack or BMS control.
MOUNTING THE SENSOR
RANGE TEST
ON-delay is the time given to the sensor to inhibit its
output to avoid unnecessary HVAC operation activated
by walk-through traffics or short stay. OFF-delay is the
time the relay output will be engaged after the sensor
detects the last motion within its range.
Both ON and OFF delay times can be easily set by
placing the header at respective pin position on the
sensor board as per following table.
IR-TEC International Ltd. warranties this product to be free of defects in
materials or workmanship for a period of five years from date of shipment.
There are no obligations or liabilities on the part of IR-TEC International Ltd.
for consequential damages arising out or in connection with the use or
performance of this product or other indirect damages with respect to loss
of property, revenue, profit, or cost of removal, installation or reinstallation.
ON & OFF DELAYS
WARRANTY
RANGE ADJUSTMENT
3 different temperatures are available by placing the
header at respective position for high and low setbacks
setting. When room temperature goes above or below
the High or Low limit, the relay output will be activated
automatically during vacancy period.
TEMPERATURE SETBACKS
SENSOR SETTINGS
Ceiling mount
Wall mount
0.3”
1
2
1.
2.
3.
2
3
1
0.9”
Tightening Screw
End-cap
It is best to leave
approximately 6
inches between the
sensor and the wall
so that the tightening
screw can be
accessed.
Mount the first screw with approximately 0.3”
head-off the wall for ease of base mounting.
Note: The end-cap
can be snap-in to
cover the back of
bracket.
3
5
4
6
End-cap
1 2
3
Note: The OFF-delay can be set to the shortest (position
A) for convenience of testing. Ensure to replace the
jumper header at the desired position after testing. The
LED will blink if any header is NOT properly placed.
The OS-551/551T comes with pigtail wires for
connection to the corresponding wires of IR-TEC power
pack or BMS control. Each IR-TEC PPU-300/301 power
pack can supply power for up to 6 OS-551 sensors.
When more sensors are connected, multiple power
packs may be required. Various control modes may be
achieved by different wiring connections. The following
diagrams are typical control for reference. For the
availability of more complex control, please contact
info@irtec.com for technical assistance.
WIRING DIAGRAM
B. Manual-ON/Auto-OFF with PPU-300
A. Auto-ON/Auto-OFF with PPU-301
OS-551
Cable access
Terminal blocks
Infrared sensor
(Don't touch!!)
Locking bolt
Corner Knockout
OFF Delay
ON Delay
P.C.B
Fixing screw
OS-551T
Cable access
Terminal blocks
Infrared sensor
(Don't touch!!)
Locking bolt
Corner Knockout
OFF Delay
ON Delay
P.C.B
Fixing screw
Temperature
setbacks(High)
Temperature
setbacks(Low)
Factory set
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