S+S Regeltechnik AERASGARD RCO2-AS Serie Notice D'instruction page 7

G
Installation and Commissioning
ATTENTION !
The minimum CO2 concentration of outdoor air in vegetated, hardly industrialised areas is about 350 ppm. The gas exchange in the sensor
element takes place by diffusion. Depending on the changes to the concentration and the flow velocity of the air surrounding the sensor, the reac-
tion of the device to the change of concentration may take place with a delay. It is imperative that the device is positioned in such way that the
air stream flows well around the sensor. Otherwise the gas exchange may be considerably delayed or prevented. Furthermore, the device should
not be set up in the direct air flow of a CO2 source (e.g. exhaled breathing air) in order to avoid incorrect measurements
Commissioning
After the device is switched on, a self-test and temperature equalisation are performed. Depending on the ambient conditions, this process takes
30-50 minutes (as an option, manual calibration can now be performed). If commissioning with automatic calibration, proceed as follows:
1. Open all windows or set the air conditioning system to use outdoor air
2. Switch on the device and move away from the device. If possible, all persons should leave the room.
3. The device is ready to use after 50 minutes.
Automatic calibration of the CO2 measurement
The regular exchange of fresh air is all that is required for the self-calibration technology in the sensor (CO2 concentrations: 350-500 ppm). The
device detects this condition and performs the calibration automatically. It is sufficient to open the windows or set the air conditioning system to
use outdoor air at regular intervals and to stop all CO2-producing processes that influence the ambient air. Proceed as follows:
Open all windows fully or set the air conditioning system to use outdoor air 1x weekly for 15-20 minutes.
If possible, all persons should leave the room during this time.
Regular ventilation of the rooms and flushing of the duct with fresh air will increase the measuring accuracy of the sensor.
Manual calibration of CO2 measurement
Before starting, you must ventilate the room intensively to bring it up to fresh air level (≤ 500 ppm)! Manual calibration can be carried out
independently of automatic calibration. Sufficient fresh air must be provided before and during the calibration procedure (CO2 concentration:
350-500 ppm). Also make sure that no CO2-producing processes influence the ambient air. Proceed as follows to perform manual calibration:
1. Preparation: Remove the housing cover (see illustration on page 16) and open all windows or set the air conditioning system to use outdoor
air. Wait 15 minutes (ventilation). All persons should leave the room during this time.
2. Press and hold the "ZERO" button until the flashing LED row changes to a steady light after 5 seconds.
3. Now leave the room again.
4. After another 2 minutes, the calibration is complete, and the LED display should indicate a CO2 concentration of between 350-500 ppm (level
1: LED 1, green).
Acoustic signal
When the range changes, a signal tone is emitted to provide feedback that the next warning level has been reached, without having to look
directly at the traffic light. The acoustic signal can be switched off via DIP switch (position OFF = signal tone off).
Measured value exceeds 1000 ppm
Measured value exceeds 1400 ppm
Measured value exceeds 2000 ppm
Measured value exceeds 2800 ppm
Notes regarding mechanical mounting and attachment:
Mounting shall take place while observing all relevant regulations and standards applicable for the place of measurement (e.g. such as welding
instructions, etc.). Particularly the following shall be regarded:
– VDE ⁄ VDI directive technical temperature measurements, measurement set - up for temperature measurements.
– The EMC directives must be adhered to.
– It is imperative to avoid parallel laying of current-carrying lines.
– We recommend to use shielded cables with the shielding being attached at one side to the DDC ⁄ PLC.
Before mounting, make sure that the measuring device technical parameters comply with the actual conditions at the place of utilization, in
particular in respect of:
– Measuring range
– Permissible maximum temperature and humidity
– Protection type and Protection class
– Oscillations, vibrations, shocks are to be avoided (< 0.5 g)
→
1x 0.5 seconds a short acoustic signal sounds (level 3: LED 3, yellow 20 %)
→
2x 0.5 seconds a short acoustic signal sounds (level 4: LED 4, yellow 20 %)
→
3x 0.5 seconds a short acoustic signal sounds (level 5: LED 5, red
→
1x 1.5 seconds a short acoustic signal sounds (level 5: LED 5, red 100 %)
Rev. 0000 - V12
20 %)