Wireless Ceiling Mount
Occupancy Sensors

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The SENSORWORX®wireless ceiling mount occupancy sensor is a simple, yet reliable battery powered control solution. Preferred by contractors for their flexible mounting methods, SENSORWORX wireless sensors greatly reduce total installation time and wireless pairing fuss. Requiring just a few seconds per device, SENSORWORX wireless sensors can be linked to one or more wireless load controllers (such as the SWX-851 wireless wall switch, or a SWX-950 series wireless power pack). Additionally, these sensors can be configured to work in applications with other wireless or wired ceiling, corner, or hallway sensors to provide extended coverage in large or irregularly shaped spaces. 

As with all SENSORWORX products, the latest PIR (passive infrared) technology and techniques are used to provide unmatched occupant detection performance and energy savings. Additionally, units are available with an integrated microphone to provide overlapping passive acoustic detection for rooms with obstructions or where occupant motion is limited. An integrated daylight harvesting photocell is also an available option for PIR only units. 


Basic Operations

Sensors detect movement in the infrared energy that radiates from occupants as they move within the device’s field-of-view. Once occupancy is detected, the sensor immediately signals a wirelessly linked load controller (e.g. power pack) to switch on or dim up the connected lighting. If equipped with passive dual technology (PIR/Acoustic), the units microphone is then also enabled to further enhance detection while the lights are on. At regular intervals, the sensor will retransmit its latest occupancy status such that the load controller can keep lights on for occupants during brief periods of inactivity, while returning the space to an energy saving lights off (or dim) state once no longer occupied.



Small Spaces

For control of small spaces like a private office, a single sensor linked to a wireless wall switch controller (SWX-851) is recommended (see diagram on right). Linking additional sensors is also an option if necessary. Switching from a second location (e.g. 3-way) is achieved by linking a remote wireless wall switch to the wireless switch controller. Both occupancy (auto-on) and vacancy (manual-on) operation are achievable in order to meet energy code requirements. Dual Technology sensors are recommended in spaces where people are seated or where obstructions like bathroom stalls block line of site to the sensors.

  • Small Offices
  • Copy Rooms
  • Private Restrooms

Large Spaces

Multiple wireless sensors can be easily linked to a wireless power pack load controller (SWX-950) to provide coverage for larger spaces (or larger loads) like an open office. Additional functionality such as switching/dimming from multiple locations (e.g. 3-way) or interfacing with wired control devices is achieved by linking to a wireless power pack with appropriate functionality. Dual Technology sensors are recommended in spaces where people are seated and/or where obstructions like cubicle walls block line of site to the sensors.

  • Classrooms
  • Open Areas
  • Conference Rooms
  • Hallways
  • Break Rooms

Occupancy w/ Integrated Photocell Option

There are several types of photocell operational modes supported by this option. The mode is selected at the linked wireless power pack or wall switch controller that is wired to the lighting load(s).

  • Recommend for spaces where it is important to not distract occupants (e.g., offices, classrooms).
  • Lights will gradually dim in order to maximize energy savings while maintaining desired overall lighting level.
  • Requires dimming power pack controller.
  • Option to dim to low trim or turn lighting off.

  • Recommended for public spaces (hallways, entryways, etc) where fully switching of lighting off and on will not cause distraction of occupants.
  • Lights are switched off if ambient light level surpasses threshold and back on if level drops.

  • Lighting is held off if sufficient ambient light level is present upon initial occupancy.
  • Lighting will turn on if light level drops below setpoint.
  • Once on, lighting will only turn off from vacancy or a manual switch, never from daylight.

Features / Ceiling Mount Sensors

  • Links in Seconds with Wireless Controllers

  • Passive Infrared (PIR) Detection

  • Passive Dual Technology (PIR/Acoustic) Detection (Optional)

  • 360° Small Motion Coverage

  • Compact Size and Matte Finish

  • Four Contractor Friendly Mounting Methods

  • Mounting Nipple Attachment with Integrated Hole Saw

  • Convenient Test Modes

  • Optional Daylight Harvesting & On/Off Photocell



4.00” Diameter x 1.25” Height
(10.16 cm x 3.17 cm)

4.75 oz.

White or Black

Motion Detection (when in Test Mode)
Wireless Linking (Pairing)


32°F to 122°F
(0°C to 50°C)

0-95% Non-Condensing
Indoor Use Only

& Wireless

Requires one CR123(A) Lithium Battery

PIR Model – Designed for 10 yr.
PIR & Daylight Harvesting
Model – Designed for 7 yr.
Dual Tech. Models – Designed for 5 yr.
Non-Volatile Memory (saves all settings regardless of battery state)
Blink Warning @10% Life

80’ line of sight w/o obstruction (walls)
40’ with obstruction (walls/floors)

915 MHz ISM Band

Simple 3 sec. Push Button Process

All Wireless Data is Encrypted


Configured at Linked Load Controller
Motion: Occupancy & Vacancy
Photocell: Daylight Harvesting & On/Off

SWX-851 Wall SwitchSWX-950 Series Power Packs

Button Toggles On/Off
Wirelessly Linked Loads

White LED Illuminates Upon Detected Occupancy

Configured at Linked Load Controller(s)
1, 5, 10, 15, 20, 30 min

Code Compliance

These sensors can be used to meet ASHRAE 90.1, IECC, & Title 24 energy code requirements.


    Passive Infrared (PIR)

    • Detection range improves when walking across beams as compared to into beams.
    • Lenses can be swapped in field if necessary, contact technical support for assistance.
    • Line of site between occupant and sensor is required for detection.
    • Sensor can not see through glass windows or doors.
    • Spaces with small temperature differential between occupants and ambient may encounter reduced sensitivity/range.
    Small Motion 360°
    • Excellent detection of small motions from sitting or stationary occupants (e.g. hand motions).
    • 8 to 12 ft (2.44 to 4.57 m) mounting height recommended.
    • ~500 ft2 of coverage



    Dual Technology (PIR/Acoustic)

    • Units with dual technology (model SWX-221-B) have overlapping acoustic detection of the complete PIR coverage area. 

    • A PIR event is required to initially enable acoustic detection. 

    • Sounds indicating occupancy reset the sensor’s time delay while non-occupant noises are filtered out. Occupant sounds alone will not keep lights on indefinitely, PIR motion must be periodically detected for lights to remain on for an extended time. 

    • After sensor time out expires, acoustic detection remains enabled for 15 seconds to enable voice reactivation of lights for additional convenience and safety. 

    Battery Information

    • The sensor runs on one CR123(A) Lithium Battery (included).
    • 10 year battery life design for PIR only models. For PIR units with enabled integrated photocells, expected battery life is 7 years. For dual technology units with acoustic detection enabled, expected battery life is 5 years. 

    • Install battery prior to mounting sensor. Polarity is indicated on the battery compartment door.
    • If the sensor’s battery life reaches 10%, all wirelessly linked load controllers will blink lights on/off/on upon initial occupancy as a replacement warning.
    • Replacement batteries are available at most retailers or home centers where batteries are sold or from SENSORWORX.

    Operation Notes

    • Wireless sensors periodically transmit their PIR and/or acoustic (if equipped) occupancy status. Referred to as the sensor’s “heartbeat”, this period is optimized to conserve battery life. 

    • If a sensor transmitted “unoccupied” at its last heartbeat, any new PIR detection event will be transmitted immediately. 

    • Using the information received from linked sensors, wirelessly linked load controllers switch lighting accordingly. 

    • All load controllers have a master time delay that is initially set only when a PIR occupancy transmission is received from a linked sensor. The time delay will then be reset every time a sensor reports any occupancy (either PIR or acoustic). Lights will be switched off once all linked sensors have continuously reported unoccupied for the duration of the time delay. 

    • To prevent lights from staying on indefinitely from just acoustic events, after ~30 minutes the load controller will stop considering acoustic events from all linked sensors until after a PIR event is received again. 

    • As an added safety measure after lights are switched off, acoustic detection remains enabled for 15 seconds to enable voice reactivation of lights. 

    • If a load controller does not receive any heartbeat transmissions from a linked sensor for 10 minutes it will blink out an error code (4 blue blinks, followed by a pause) and consider itself occupied (so as to override the lights on). If more than one sensor is linked, the sensor heartbeats from all sensors must have stopped for the error warning to begin blinking. 

    • Sensors with the integrated photocell require auto-setpoint calibration to be initiated from the sensor in order to enable photocell operation. 

    • Every ~15 seconds the photocell transmits the light level it is measuring in the space. 

    • Dimming from high trim to low trim (or in reverse) due to daylight harvesting requires ~1.5 minutes. 

    • The wirelessly linked load controller(s) compares the received light level to the setpoint and controls the connected lighting accordingly. 

    • Wireless load controllers will only listen to a single wireless photocell sensor. If more than one is wirelessly linked, the unit that last ran the auto-setpoint calibration procedure will be used. 

    • The photocell control algorithm compensates for the contribution of the controlled lighting to the overall light level of the space. This prevents lights from cycling back on shortly after they are switched off by the photocell operation. 

    • Refer to the instruction sheets of the wirelessly linked controllers for information on their respective LED blink out behavior when controlled lights are transitioning on or off from photocell operation. 

    • To accomodate multi-zone photocell applications, wireless power packs can be configured to track according to the received daylight level, but control lights a fixed percentage brighter.

    Installation Options

    Wireless Linking (Pairing)

    Linking a sensor with a wireless wall switch controller or power pack load controller is quickly done via the following procedure:

    Step 1. Enter pairing mode by holding down the wireless load controller’s button for 3 seconds until the LED starts alternating white then blue, then release.

    Step 2. At the sensor, hold down the programming button for 3 seconds until the LED starts alternating white then blue. Releasing will link the sensor with any device in pairing mode
    (see note 1 below). The lights will toggle once as confirmation.

    Step 3. Repeat step 2 to link another sensor or device.

    Step 4. When all devices have been linked, exit pairing mode on the wireless load controller by pressing the button 1 time. Pairing will also be automatically closed after 15
    minutes of no new devices being linked.

    Note 1: When in pairing mode, the alternating LED colors on the wireless load controller will periodically pause and blink out the total number of linked devices. There will be no blinks
    during the pause until the first device is linked.

    Ordering Info

    SWX–Ceiling Mount Sensor2Passive Infrared (PIR)0Small Motion 360º1Battery–BWhite(Blank)
    Passive Infrared (PIR) + Daylight Harvesting Photocell1Black–BK*
    Passive Dual Technology (PIR/Acoustic)2

    * Not available on units w/ Photocells

    SWX–299–JPCeiling Sensor Trim Ring for Mounting to Single Gang Mudring, Handy Box, or 4” Octagon Box

    Compatible Wireless Products

    Wireless Wall Switch

    This intuitive wall switch load controller requires no neutral connection or minimum load to operate.

    Wireless Power Packs

    These load controllers switch a full lighting or plug load, and are available with optional 0-10V dimming.

    Wireless Dimmer & Switch

    These stylish and intuitive wall stations are designed for a 10 year battery life.

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