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3

Sensor Operation

The  Task  Ambient  Photo  (TAP)  sensor  monitors  interior  light  levels.  The  TAP 

sensor is powered by solar energy from natural or artificial light sources. The 

solar energy is transformed into electrical energy which is then stored, providing 

a continuous power source for the sensor. The sensor will operate even with a 

brief exposure to light, however for best results the sensor should be mounted 

in a location with exposure of 3-6 hours of natural or artificial light (250 - 500 lux 

or 25-50 fc) on a daily basis.
The sensor transmits telegrams containing the light level and storage capacitor 

voltage  level.  The  sensor  must  be  within  range  of  any  linked  receivers  or 

controllers, installed within 24m (80’) of each other. For applications exceeding 

24m (80’) range, telegram repeaters may be needed to extend the reception 

range.
The photo sensor supports the following Sensor profile:

EEP A5-06-02: Light Sensor

 

DB_1: 0 lux - 1024 lux

 

DB_2: 0 lux - 512 lux

 

DB_3: Supply Voltage 0…5.1V, linear n=0…255

Daylight Harvesting

The sensor will repeatedly broadcast a telegram on a timer (heart beat timer). 

The time period adjusts automatically to the ambient light levels and energy 

charge stored on the radio.

Light Level

Timer

< 50 lux (5 fc)

100 seconds

> 50 lux (5 fc)

linear ramp from 60 to 10 seconds (as 

device approaches full charge)

Mounting the Sensor

The  sensor  can  be  mounted  on  any 

surface;  ceiling,  wall,  desk,  cubicle 

wall, etc.
The  mounting  location  of  the  sensor 

is  important  as  this  will  directly 

affect  the  receivers  reception  of  the 

telegrams.  Before  installing,  refer  to 

the sections in the guide detailing the 

installation of wireless devices, layout 

tips and test operation modes.
The sensor should be placed so there 

is  direct  exposure  to  a  window.  The 

most  common  mounting  location  for 

photo sensors is ceiling mount, centered with the window, about 4’ from the 

TIP: To get feedback on the 

light level where the sensor 

is mounted, refer to sections 

“Test Operating Modes” and 

‘Light Level Test”.

TIP: For range verification 

between the sensor and 

controller, refer to sections 

“Test Operating Modes” and 

‘Installing Wireless Devices”.

Summary of Contents for TAP-21 Series

Page 1: ...so referred to as the sensor in this guide is a wireless energy harvesting sensor that monitors light levels within interior spaces and transmits the value to lighting controllers The sensor measures...

Page 2: ...2 Page Left Blank Intentionally...

Page 3: ...3 Supply Voltage 0 5 1V linear n 0 255 Daylight Harvesting The sensor will repeatedly broadcast a telegram on a timer heart beat timer The time period adjusts automatically to the ambient light levels...

Page 4: ...0 foot candles or 1024 lux 100 foot candles The factory default is 512 lux 3 Press the rear mounting plate back into position Installing or Replacing the Start Assist Battery The battery is not requir...

Page 5: ...rs 5 826 83 9 0 hours 91 25 hours The time to fully charge is based on the storage capacitor charging from a non operational condition Discharge time indicates how long a fully charged sensor will ope...

Page 6: ...ng the test button for 6 seconds Commissioning Test Mode This mode accelerates the time period between transmissions of the current light level to every 10 seconds for a duration of 5 minutes regardle...

Page 7: ...0 90 Metal 90 100 Aluminum 90 100 Wireless System Layout Hints Avoid locating transmitters and receivers on the same wall Avoid locating transmitters and receivers where the telegrams must penetrate w...

Page 8: ...S 210 902 MHz models only Contains IC 5713A STM300U CE 868 MHz models only CE Marking ARIB STDT108 928MHz models only Complies with the Japanese radio law and is certified according to ARIB STDT108 Th...

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