S S REGELTECHNIK RCO2-AS GmbH Room CO2 Sensor & Transducer Instruction Manual

S S REGELTECHNIK RCO2-AS GmbH Room CO2 Sensor & Transducer

Operating Instructions, Mounting & Installation

CO2 traffic light ⁄ mobile CO2 sensor, room CO2 sensor with traffic light indicator and acoustic signal, self-calibrating

Dimensional drawing

Dimensional drawing with stand holder

Maintenance-free room sensor AERASGARD® RCO2-AS xx with traffic-light indicator and acoustic signal, self-calibrating, in an attractive plastic housing, for determining the CO2 content of the room air (0…3000 ppm). The measuring transducer converts the measurand to a standard signal, which is directly presented visually via coloured LEDs (traffic light indicator). An additional signal tone sounds when the warning levels are reached (can be switched off via DIP switch).
Available as a table-top unit RCO2-AS NT ST with micro USB power cord and stainless steel stand holder, as well as the device versions RCO2-AS NT (with plug-in power supply unit), RCO2-AS UPNT (with in-wall power supply unit) and RCO2-AS (without power supply unit) for wall mounting.
The room filter with CO2 traffic light is used in classrooms, training rooms and convention centres, offices, hotels, apartments, shops, etc. and is used for easy and quick evaluation of the indoor climate. This enables energy- saving demand-based room ventilation, thereby reducing operating costs and improving well-being. We recommend one sensor for every 30 m²  of space. The CO2 measurement is performed using an optical NDIR sensor (non-dispersive infra-red technology).

TECHNICAL DATA

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 → 1x 0.5 seconds a short acoustic signal sounds (level 3: LED 3, yellow 20 %)
• Measured value exceeds 1400 ppm → 2x 0.5 seconds a short acoustic signal sounds (level 4: LED 4, yellow 20 %)
• Measured value exceeds 2000 ppm → 3x 0.5 seconds a short acoustic signal sounds (level 5: LED 5, red 20 %)
• Measured value exceeds 2800 ppm →   1x 1.5 seconds a short acoustic signal sounds (level 5: LED 5, red 100 %)

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)

General notes

• This device may only be used in pollutant-free non-precipitating air without above-atmospheric or below-atmospheric pressure at the sensor element.

• The CO2 sensor is shock-sensitive. Due to the mechanism’s design, the measuring result may vary if shaken.

• Dust and pollution falsify measurement results and are to be avoided. Slight pollution and dust sediments can be removed by using compressed air.

• In case of pollution, we recommend cleaning and recalibration in the factory.

• In any case, the sensor must not get in contact with chemicals or other cleaning agents.

• The device must be connected to one power supply only.
  If you use the USB socket for power supply (5V), the connection terminals on the circuit board must remain unused, and vice versa.

• A cyclical fresh air supply must be provided because incorrect measurements can occur.

• The device must be permanently energized to measure the CO2 concentration correctly.

• If this device is operated beyond the specified range, all warranty claims are forfeited.

Our “General Terms and Conditions for Business“ together with the “General Conditions for the Supply of Products and Services of the Electrical and Electronics Industry“ (ZVEI conditions) including supplementary clause “Extended Retention of Title“ apply as the exclusive terms and conditions.

In addition, the following points are to be observed:

• Devices must only be connected to safety extra-low voltage and under dead-voltage condition.

• This device shall only be used for its intended purpose. Respective safety regulations issued by the VDE, the states, their control authorities, the TÜV and the local energy supply company must be observed. The purchaser has to adhere to the building and safety regulations and has to prevent perils of any kind.

• No warranties or liabilities will be assumed for defects and damages arising from improper use of this device.

• Consequential damages caused by a fault in this device are excluded from warranty or liability.

• The technical data and connecting conditions of the mounting and operating instructions delivered together with the device are exclusively valid. Deviations from the catalogue representation are not explicitly mentioned and are possible in terms of technical progress and continuous improvement of our products.

• In case of any modifications made by the user, all warranty claims are forfeited.

• This device must not be installed close to heat sources (e.g. radiators) or be exposed to their heat flow.
  Direct sun irradiation or heat i rradiation by similar sources (powerful lamps, halogen spotlights) must absolutely be avoided.

• Operating this device close to other devices that do not comply with EMC directives may influence functionality.

• This device must not be used for monitoring applications, which serve the purpose of protecting persons against hazards or injury,
  or as an EMERGENCY STOP switch for systems or machinery, or for any other similar safety-relevant purposes.

• Dimensions of housings or housing accessories may show slight tolerances on the specifications provided in these instructions.

• Modifications of these records are not permitted.

• In case of a complaint, only complete devices returned in original packing will be accepted.

Notes on commissioning:
This device was calibrated, adjusted and tested under standardised conditions. When operating under deviating conditions, we recommend performing an initial manual adjustment on-site during commissioning and subsequently at regular intervals.

These instructions must be read before installation and commissioning and all notes provided therein are to be regarded!

Once the aforementioned values have been reached, the respective LED becomes active (with increasing luminosity of 20 %, 40 %, 60 %, 80 % and 100 %);
LEDs that are already active continue to be illuminated.

Housing

To open the housing, set a screwdriver (2.0) in the groove at centre, press down, and lift up the bottom frame slightly. Pull top cover forward and hold it.

Copyright by S+S Regeltechnik GmbH

Subject to errors and technical changes. All statements and data herein represent our best knowledge at date of publication. They are only meant to inform about our products and their application potential, but do not imply any warranty as to certain product characteristics. Since the devices are used under a wide range of different conditions and loads beyond our control, their particular suitability must be verified by each customer and/or end user themselves. Existing property rights must be observed. We warrant the faultless quality of our products as stated in our General Terms and Conditions.

AERASGARD® RCO2 – AS xx

Connecting diagram ATTENTION: No reverse polarity protection!

Connecting diagram DIP switches

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