Echo Light Sensors

• Current Measurement (read only) - displays the Current Measurement (lux), Lower Threshold and Upper Threshold (lux) of light of the sensor.
  • The Lower Threshold and Upper Threshold are calculated from the Photo Deadband setting and Target Lux Value and do not depend on the Current Measurement.
  •  Threshold values can be calculated by adding or subtracting the Photo Deadband fraction of the Target Lux Value to or from the Target Lux Value.
    • Lower Threshold = Target Lux Value - (Target Lux Value x Photo Deadband) / 100
    • Upper Threshold = Target Lux Value + (Target Lux Value x Photo Deadband) / 100
• [Record Target] - tap to use the current lux measurement as the Target Lux Value.
• Target Lux Value - the current recorded target lux value which can be manually adjusted (tap the value to manually adjust)

• Photo Timeout - set the length of time the Light Sensor waits before triggering the next action. Any manual lighting control in the space will reset this time. Options include 5 minutes, 15 minutes, 30 minutes, and 60 minutes.
• Photo Deadband - this setting determines the Upper and Lower Thresholds discussed above, which limit how large the difference between Target Lux Value the Current Measurement can be before the sensor takes action. Photo Deadband is expressed as a % of the Target Lux Value.
  • Photo Deadband = (Current Measurement - Target Lux Value / Target Lux Value) * 100

In Switch mode, the sensor provides configuration of Switched Bright and Switched Dark Events, each with configurable actions.

• When measured light exceeds the Bright threshold (Target Lux Value plus Photo Deadband %), the Switched Bright Event Action occurs.
  • Switched Bright Event- use the drop down menus and keypad to set the event action, the preset associated with that action, and the timing of the preset fade.
    • Available actions includeNo Function, Preset Activate, Zone Set to Level, Space Off, and Space Set to Level
• When the measured light is below the Dark threshold (Target Lux Value minus Photo Deadband %), the Switched Dark Event Action occurs.
  • Switched Dark Event - use the drop down menus and keypad to set the event action, the preset associated with that action, and the timing of the preset fade.
    • Available actions includeNo Function, Preset Activate, Zone Set to Level, Space Off, and Space Set to Level

In Dim mode, used for daylight harvesting installations, the sensor provides a Dimming Event that can be configured for either Space Raise / Lower or Zone Raise / Lower. When the measured light is found to be outside the set Photo Deadband, the sensor will continuously trigger Dimming Raise Events and Dimming Lower Events until the Target Lux Value is reached or artificial lighting reaches its maximum levels.

Note: Raise / Lower Event actions provide a "Change per second (%)" setting that is the amount of control applied per second while lux measurements are outside the Photo Deadband threshold. 1% is the default setting , meaning the lighting will change in 1% increments. Higher values equal a faster artificial lighting change.

Additional options display for configuration depending on the type of Action selected, either Space Raise / Lower, Single Zone Raise / Lower or Dual Zone Raise / Lower.

Space Raise / Lower

Setting the Dimming Event to Space Raise / Lower maintains the entire Space at the set Target Lux Value +/- the Photo Deadband using the set Change per second (%) rateRaise / Lower Event actions provide a "Change per second (%)" setting that is the amount of control applied per second while lux measurements are outside the Photo Deadband threshold. 1% is the default setting , meaning the lighting will change in 1% increments. Higher values equal a faster artificial lighting change..

Zone Raise / Lower

Setting the Dimming Event Action to Zone / Raise Lower provides additional settings to determine if the zone type is a single or dual controlled zone.

Single Zone Raise / Lower

Selecting Single Zone Type provides options to set the Zone Number and the Change per second (%) rate.

Dual Zone Raise / Lower

Setting the Zone Type to Dual allows the Echo Light Sensor to control two zones, a primary and a secondary, at different levels when issuing Dimming Event Raise / Lower commands. The sensor should be placed in the Primary zone.

The Primary Zone is the master, providing the Secondary Zone with Raise / Lower commands using a user configured Daylight Exposure offset.

Daylight Exposure (%)Daylight Exposure (%) is the percent contribution of ambient daylight to the zone. is set to 100% for the Primary Zone Number and cannot be changed. The Primary Zone Number has the highest possible capacity for ambient daylight exposure and this is the location where the Echo Light Sensor will be sampling light. The Secondary Zone Number Daylight Exposure (%) setting is user configurable.

1. Set the Primary Zone Number.
2. Set the Change per second (%) rate for the Primary Zone Number.
3. Set the Secondary Zone Number.
4. Set the Daylight Exposure (%) for the Secondary Zone Number (allowed range 10-100%). This number represents the percentage of perceived ambient daylight at the Secondary Zone as compared to the Primary Zone.
   • The Change per second (%) setting for the Secondary Zone is read only and automatically adjusts according to the relationship between the Daylight Exposure (%) in the Primary and Secondary Zone, as well as the Primary Zone Change per second (%) setting.