Wireless Photocell
& Daylight Harvesting

SWX-250-B SERIES
Battery Powered

Overview

The SENSORWORX® wireless daylight harvesting photocell is a simple, yet reliable battery powered control solution. Preferred by contractors for their flexible mounting methods, SENSORWORX wireless photocells greatly reduce total installation time and wireless pairing fuss. Requiring just a few seconds per device, SENSORWORX wireless photocells 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 units provide an auto-setpoint selection mode that assists with choosing the controlled light level for a space.

Basic Operation

SENSORWORX daylight harvesting sensors measure and transmit a space’s overall illumination to wirelessly connected load controllers. The load controllers then process these light level measurements and adjust light levels according to the configured setpoint and operational modes. For example, a connected dimming power pack load controller will gradually lower controlled lighting during times of high daylight contribution to a space. During times of no or low daylight contribution, controlled lighting will increase back up to its maximum level. A connected power pack or wall switch load controller can also be configured to switch lighting off completely in maintained high daylight conditions.

Auto-set-point calibration, where the unit determines its ambient light threshold (e.g., setpoint) based on the measured amount of light it is controlling, is initiated from the wireless photocell. The connected load controllers also provide the option of selecting from a range of preset values of ambient light thresholds (e.g., setpoints).

Applications

There are four types of photocell operation supported; DAYLIGHT HARVESTING CONTROL, DAYLIGHT HARVESTING w/ ON/OFF CONTROL, ON/OFF PHOTOCELL CONTROL, and INHIBIT PHOTOCELL CONTROL (see descriptions below). These operational modes are selected at the linked wireless power pack (SWX-950 Series) or wall switch controller (SWX-851) that is wired to the lighting load(s). A photocell sensor can be the only device wirelessly linked to a load controller or can be wirelessly linked along with wireless occupancy sensors to the same load controller(s).

DAYLIGHT HARVESTING CONTROL
  • 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.
  • After dimming to low trim level by default the lights will stay at the low trim level.
  • Optionally, lighting can be configured to turn off completely when sufficient daylight is present.
  • Requires that the wireless photocell is linked to a wireless power pack load controller with dimming (i.e. SWX-950-D2).
DAYLIGHT HARVESTING w/ ON/OFF CONTROL
  • Same as Daylight Harvesting control except lights will turn off completely when sufficient daylight is present.
ON/OFF PHOTOCELL CONTROL
  • 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.
  • To prevent cycling of lights back on after lighting is turned off, a “deadband” level equal to the measured level of light being controlled is continously maintained. For lighting to turn off the ambient light level must be higher than the sum of the setpoint and the deadband.

INHIBIT ONLY PHOTOCELL CONTROL
  • Upon initial occupancy, lighting is inhibited (i.e. held off) if ambient light level surpasses setpoint threshold.
  • Lighting will be turned on if light level drops below set-point.
  • Lighting will never turn off from daylight.

Features / Photocell & Daylight Harvesting

  • Links in Seconds with Wireless Controllers
  • Auto-Setpoint Selection Mode
  • Daylight Harvesting and/or On/Off Photocell Control
  • Multi-zone Configuration Ability
  • 10 Year Battery Life Design
  • Compact Size and Matte Finish
  • Four Contractor Friendly Mounting Methods
  • Mounting Nipple Attachment with Integrated Hole Saw

Specifications

Physical

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

WEIGHT
4.75 oz.

COLORS AVAILABLE
White

LED INDICATION
Wireless Linking (Pairing)

Environmental

OPERATING TEMPERATURE
32°F to 122°F
(0°C to 50°C)

RELATIVE HUMIDITY
0-95% Non-Condensing
Indoor Use Only

Electrical & Wireless

BATTERY TYPE
Requires one CR123(A) Lithium Battery

BATTERY LIFE
Designed for 10 Year Life
(under default settings)
Non-Volatile Memory
(saves all settings regardless of battery state)
Blink Warning @10% Life

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

FREQUENCY
915 MHz ISM Band

WIRELESS LINKING
Simple 3 sec. Push Button Process

SECURITY
All Wireless Data is Encrypted

Operation

OPERATING MODES
Daylight Harvesting
On/Off Photocell Control
Modes Configured in Linked Controller

COMPATIBLE LOAD CONTROLLERS
SWX-851 Wall Switch
SWX-950 Series Power Packs

WIRELESS TEST MODE
Button Toggles On/Off Wirelessly Linked Loads

SET-POINT CONFIGURATION
Auto-Setpoint Mode or
Selection from Linked Controller

Code Compliance

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

Battery Information

  • The sensor runs on one CR123(A) Lithium Battery (included).

  • Install battery prior to mounting photocell. Polarity is indicated on the battery compartment door.

  • If the photocell’s battery life reaches 10%, all wirelessly linked load controllers will blink lights on/off/on upon initial turn on as a replacement warning.

  • Replacement batteries are available at most retailers or home centers where batteries are sold or from SENSORWORX.

Installation Options

Wireless Linking (Pairing)

Linking a wireless photocell with a wireless load controller (e.g. SWX-950 series power pack or SWX-851 wall switch) is quickly done via the following procedure:

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

Step 2. At the photocell, hold down the programming button for 3 seconds until the LED starts alternating white then blue. Releasing will link the photocell with any device in learn mode (see note 1 below) and. The lighting load being controlled will also be toggled off/on as a visual indication of success. Once linking is complete the photocell sensor will automatically run the auto-setpoint calibration procedure.

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

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

Note 1: When in learn 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

EXAMPLE MODEL # SWX-250-B
MODEL NUMBERDESCRIPTION
SWX-250-BWireless Ceiling Mount Daylight Harvesting Photocell, Battery Powered
SWX-299-JPAccessory 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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