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”.
