User's Manual

Schneider Electric
|
II-CO2-Wireless-Device-028-6120-00 www.schneider-electric.com/buildings May 2017
7
CO2 + TRH Sensor Installation Guide
CO2 Sensor Autocalibration
Principle of operation
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 happen 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 auto-calibration period. For example, many buildings will drop quickly to background CO
2
levels when unoccupied overnight or at
weekends. The auto-calibration function uses the information gathered at these periods to recalibrate.
The auto-calibration 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 first 50 measurements after calibration are ignored when calculating the lowest value.
Autocalibration default setting
The CO
2
sensor is shipped with the auto-calibration 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 first autocalibration will happen 1 day after the commissioning, and the following auto-calibrations in 8-day intervals.
Demo Mode
The data measurement and TX period is temporarily reduced to 5 seconds. The green LED flashes once after each valid ZGP command reception
by the sensor. This feature can be used as a feedback to an installer confirming that the sensor is still in the radio range of the receiver. Remember
the sensor can receive a ZGP command only after a measured values report, so maximum green LED flashing rate is 5s. The receiver has to be
programmed to send an acknowledgment command to the sensor. The sensor automatically switches to Commissioned Mode once the 5min
timeout elapses.
Normal Mode
The sensor periodically measures T, rH and CO
2
and reports the measured values to the receiver which it is paired with. By default the nominal
measurement and Transmission(TX) period is 150s (2min and 30sec). This parameter can be edited by a ZigBee command. The sensor is always
sleeping in between two data measurements and TX. It can be woken up at any time with the push button.
When the CO
2
concentration drops below the customizable comfort value the transmission period is multiplied by 4. The sensor automatically
returns back to nominal transmission period if the CO
2
concentration value exceeds the comfort threshold value.
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two
conditions: • this device may not cause harmful interference • this device must accept any interference
received, including interference that may cause undesired operation. Changes or modifications not
approved by the manufacturer could void the user’s authority to operate the equipment. This
equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. In
order to avoid the possibility of exceeding the FCC radio frequency exposure limits, human proximity to
the antenna shall not be less than 20cm during normal operation.
This device complies with Industry Canada licence-exempt RSS standard(s). Operation is subject to
the following two conditions: • this device may not cause interference • this device must accept any
interference, including interference that may cause undesired operation of the device.
This equipment complies with IC RSS-102 radiation exposure limits set forth for an uncontrolled
environment. This equipment should be installed and operated with minimum distance 20cm between
the radiator & your body.
Le présent appareil est conforme aux CNR d’Industrie Canada applicables aux appareils radio
exempts de licence. L’exploitation est
autorisée aux deux conditions suivantes : • l’appareil ne doit pas produire de brouillage • l’utilisateur de
l’appareil doit accepter tout brouillage radioélectrique subi, même si le brouillage est susceptible d’en
compromettre le fonctionnement.