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Installation Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
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ACCESSORIES INSTALLATION
• 3 GREEN ashes signal a commissioning procedure success. The sensor will
enter demo mode for 5 minutes. This demo mode will automatically timeout after
5 minutes. The sensor then stays in commissioned mode, periodically transmit-
ting the measured values to the receiver.
• 1 GREEN ash acknowledges a valid GP command received by the sensor in
demo mode. This feature can be used as a feedback to an installer to conrm
that the sensor is still in range during the commissioning (it works only in demo
mode). In this case the receiver has to be programmed to send an acknowledg-
ment command to the sensor after the sensor data report frames.
CO2 Autosensor Calibration
The CO
2
module inside the wireless CO
2
+ TRH sensor is fully calibrated prior to
shipping from the factory. Over time, the measurement offset needs to be calibrated
to maintain the long term stability of the sensor. In most applications, this can hap-
pen automatically using the built in auto-calibration function. This technique can
be used in situations in which sensors will be exposed to typical background levels
(400-450ppm) at least once during the autocalibration period. For example, many
buildings will drop quickly to background CO
2
levels when unoccupied overnight or
on weekends. The autocalibration function uses the information gathered during
these periods to recalibrate.
The autocalibration function uses the lowest point of CO
2
concentration to recalibrate
the offset. During every measurement cycle, the CO
2
sensor stores the latest values,
and also the lowest value recorded since the last calibration point. The rst 50 mea-
surements after calibration are ignored when calculating the lowest value.
Autocalibration Default Setting
The CO
2
sensor is shipped with the autocalibration feature enabled. There isn’t any CO
2
measurement in the Factory Mode before the Commissioning. After the Commissioning
all previous CO
2
measurement data stored in the sensor is erased.
By default the rst autocalibration will happen 1 day after the commissioning, and the
following autocalibrations in 8-day intervals.
It is normal for the sensor to display invalid readings during the rst day following the
initial installation and autocalibration. Minimum of 2 autocalibrations are required for
accurate readings.
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