TR9277-EO Manual
Page 5 of 12
3. CO
2
LED Indication
There are 3 LEDs located on the right side of
the solar panel. The TR9277-EO will provide
an indication of the current
CO
2
measurement range by flashing every 15
seconds (with sufficient light, > 5 foot-
candles or 50 lux). Ranges indicated by the
flash are as follows:
•
Green=< 1100 ppm (Good
ventilation/air quality)
•
Yellow= 1100-1,500 ppm (marginal
ventilation/air quality)
•
Red= >1,500 ppm (low ventilation &
potentially poor air quality)
•
Note: These LEDs are also used for
the test function modes of the sensor.
To determine the exact
CO
2
value, press the function button on the side of the unit. The LEDs will
flash in sequence to indicate the concentration where: Green blinks = 500 ppm/blink, Amber blinks =
100 ppm/blink, Red blinks = 25 ppm/blink. Add the blink values up to determine the concentration.
4. Installation
The TR9299-EO can be mounted on any surface; glass, stone, concrete, wallboard, cubicle
partitions, etc. The sensor can be mounted using screws (not supplied)
through the removable back plate (2 keyholes or using double-sided tape or
Velcro™ (not supplied).
The mounting location of the wireless transmitter is important, as this
will directly affect the receiver’s reception of the telegrams. Before
installing, refer to following sections in the guide detailing the
installation of wireless devices, layout tips and the test operation
modes.
1.
The TR9277-EO has a removable back plate. The back plate
has a security feature which requires a tool for the removal of
the device from the back plate. To remove the back plate, insert
a flat head screw driver, into the slot and exert torque on the
key tab to separate the back plate from the housing body as
shown in the photos. Once the tab is free, pull the body away
from the back plate.
2.
Mount the back plate to a bracket or the wall surface in a
vertical orientation with
the plastic key on the bottom. There are
keyholes in the back plate that mate with standard electrical
box screw patterns. Alternatively, you can mount the sensor
using double sided tape or Velcro® (not supplied).
3.
Once the back plate has been secured to the wall or mounting
bracket, align the two top alignment tabs on the back plate with
the enclosure body and press the lower edge over the plastic
key until it clicks in place.
