Page 3
RTC CO
2
, Temperature and Humidity Sensor Configuration Guide
taken to insure proper reception of the sensors transmissions at the
receiver, refer to sections “Test Operating Modes” and ‘Installing
Wireless Devices”.
i
Note
:
The RCT comes populated with a CR2032 coin cell battery.
The battery is not required for normal operation when
the RCT receives adequate natural or artificial light. The
battery is required for calibration.
i
Note
:
Even with a brief exposure to light the sensor will operate,
however for best results the sensor should be mounted in
a location with exposure to 4 hours of natural or artificial
light on a daily basis.
Performing a CO2 Background Calibration
It is highly recommended that the installer perform an ambient air
calibration of the RCT as part of the installation process. The sensor
will take the lowest
CO
2
recorded since its last calibration cycle and
assign this reading the value of 420ppm (outdoor air). This process
takes 15-60 minutes and can be performed on-site or prior to visiting
the site. Multiple sensors can be calibrated at the same time. Further
instructions on other adjustments that can be made can be found
1) Place the sensor(s) in outside air above 32ºF (0ºC), and out of
direct sunlight for 15 to 60 minutes. Avoid areas where people are
lingering so the background
CO
2
readings are not affected. The
sensor will take the lowest
CO
2
recorded since its last calibration
cycle and assign this reading the value of 420ppm (outdoor air).
2). Press the function button on the sensor until the green LED is
blinking, about 6 seconds.
3.) Tap the function button to cycle through modes. Once the Red
LED (only) is blinking, press and hold for ~ 6 seconds to enter
CO
2
background calibration mode, there will be a pause then the Green
LED will begin blinking.
4). After about 6 seconds the green LED will stop blinking when
calibration is complete.
Install the sensor in the targeted location and connect to an
EnOcean network.
There is also an option to set a specific value for the
CO
2
sensor to
calibrate to. The process for doing this is explained in detail later in
this guide. It is important to note that any calibrations should be
done so that the air around the sensor is at the concentration to be
used for calibration. Flowing calibrated gas through a tube to the
