S+S Regeltechnik AERASGARD RLQ-CO2 Repair manual

RLQ- ⁄ RTM- ⁄ RFF- ⁄ RFTF-CO2und RCO2
Room air quality ⁄ temperature ⁄ humidity
and CO2 sensor respectively measuring transducer (VOC)
KLQ-CO2und KCO2including mounting flange
Duct air quality and
CO2 sensor respectively measuring transducer (VOC)
Operating instructions, mounting & installation
Industry-oriented solutions –
Complete control technology from one source!
S+S REGELTECHNIK GMBH | KLINGENHOFSTR. 11 | 90411 NUREMBERG | GERMANY |
PHONE +49(0)911⁄ 51947-0 | FAX +49(0)911 ⁄ 51947-70 | www.SplusS.eu |[e-mail]

Circuit diagram RLQ-CO2
AERASGARD®RLQ-CO2
AERASGARD®RTM-CO2
AERASGARD®RCO2
Room air quality, temperature and CO2 sensors respectively measuring
transducers (VOC), self-calibrating, with active output, series OdinII
APPLICATION:
This self-calibrating microprocessor-controlled CO2and mixed gas measuring instrument is used
for the detection of air quality and ⁄ or CO2content in air within a range of 0 ppm to 2000 ppm CO2.
Measuring signals are converted into standard signals of 0 –10 V. Optional, this device can be sup-
plied with switching output, or with a combination of various output variants such as temperature
and humidity.
The CO2content of air is determined by a NDIR sensor. Self-calibration of the CO2measurement
takes place in cycles of ca. 7 days. In order to ensure this function, the device must be exposed to
fresh air (CO2content 300...400 ppm) at least once every 7 days.
The air quality detection range is calibrated for standard applications such as air quality monitoring
in residential and conference rooms. The lifetime of the chemical mixed gas sensor used for this
purpose is limited. It depends on type and concentration of pollutant gases. When device-specific
parameters are observed, the expected lifetime is at least 36 months.
TECHNICAL DATA:
Power supply: .................................. 24V AC ⁄ DC
CARBON DIOXIDE :
CO2 sensor: ..................................... optical sensor (NDIR),
non-dispersive infrared technology
Measuring range, CO2: .................. 0 … 2,000 ppm CO2
Output, CO2: .................................... 0-10V
Measuring accuracy, CO2: ............. ± 40 ppm, ± 5% v.EW
Pressure dependence: ................... ± 1,6 % ⁄ kPa (referred to standard pressure)
Long-term stability: ........................ ± 1% of final value per year
Gas exchange: ................................. by diffusion
AIR QUALITY :
Air quality sensor: ........................... VOC sensor (metal oxide)
(VOC = volatile organic compounds)
Measuring range, air quality:
......... 0…100 % (mixed gas pollution referred to calibrating gas)
Output, air quality: .......................... 0 -10V (0 V = clean air, 10V = polluted air)
Measuring accuracy, air quality: ...... ± 20 % of final value (referred to calibrating gas)
TEMPERATURE :
Measuring range, temperature: ...... 0 …+50 °C
Output, temperature:..................... 0 -10 V
Warm-up period: ............................. ca. 1 hour
Ambient temperature: ................... 0…+50 °C
Electrical connection:..................... 0.14 -1.5 mm2via screw terminals on circuit board
Enclosure: ........................................ plastic, material ABS,
colour pure white (similar RAL 9010),
stainless steel enclosure optional
Dimensions: ..................................... 95 x 97 x 30 mm (Odin II)
100 x 100x 25 mm (stainless steel enclosure)
Installation: ...................................... on-wall or on in-wall flush box Ø 55 mm,
base with 4 holes for mounting on vertically or horizontally
installed flush boxes, with predetermined breaking point
for on-wall cable entry
Protection class:
............................. III (according to EN 60 730)
Protection type: .............................. IP 30 according to IEC 529)
Standards: ....................................... CE conformity, electromagnetic compatibility
according to EN 61326 + A1 +A2,
EMC directive 89 ⁄ 336 ⁄ EWG,
low-voltage directive 73 ⁄ 23 ⁄ EWG
xx CO2
Circuit diagram RCO2 ⁄RTM-CO2

Connecting diagram RCO2
Connecting diagram RLQ - CO2
Connecting diagram RTM - CO2
Dimensional drawing Enclosure Odin II
xx CO2
xx CO2
with stainless
steel enclosure
RTM - CO2- A
with LED
(traffic light CO2 indication)
xx CO2
with display
Traffic light indication RTM - CO
2
- A
LED Range (CO
2
- content)
Green 1 0 - 500 ppm
Green 2 500 - 800 ppm
Yellow 800 - 1200 ppm
Red 1 1200 - 1600 ppm
Red 2 > 1600 ... > 2000 ppm
Type ⁄ WG1 Measuring range Measuring range Measuring range Output Output Output
CO2Air quality (VOC) Temperature CO2Air quality (VOC) Temperature
RCO20 … 2,000 ppm – – 0 -10 V – –
RTM - CO20 … 2,000 ppm – 0 ...+ 50 °C 0 -10 V – 0 -10 V
RTM - CO2- A 0 … 2,000 ppm – 0 ...+ 50 °C 0 -10 V – 0 -10 V
RLQ -CO20 … 2,000 ppm 0 …100 % – 0 -10 V 0 -10 V –
RLQ - CO2- Display 0 … 2,000 ppm 0 …100 % – 0 -10 V 0 -10 V –
xx - CO2- stainless steel enclosure
A = With ”traffic light“ (five coloured LEDs) indicating the CO2content
Note: The CO2+ mixed gas measuring transducer must not be used as safety-relevant device!

AERASGARD®KLQ-CO2 ⁄ KCO2
including mounting flange
AERASGARD®ALQ-CO2 ⁄ ACO2
Duct and on-wall air quality and CO2 sensors respectively measuring
transducers (VOC), self-calibrating, with active output
APPLICATION:
These self-calibrating microprocessor-controlled CO2and mixed gas measuring instruments are used for
the detection of air quality and ⁄ or CO2content in air within a range of 0 ppm to 2000 ppm CO2. Measuring
signals are converted into standard signals of 0 –10 V. Optional, this device can be supplied with switching
output, with 9-point LED indication, or with a combination of various output variants.
The CO2content of air is determined by a NDIR sensor. Self-calibration of the CO2measurement takes place
in cycles of ca. 7 days. In order to ensure this function, the device must be exposed to fresh air (CO2content
300...400ppm) at least once every 7 days.
The air quality detection range is calibrated for standard applications such as air quality monitoring in resi-
dential and conference rooms. The lifetime of the chemical mixed gas sensor used for this purpose is limited.
It depends on type and concentration of pollutant gases. When device-specific parameters are observed,
the expected lifetime is at least 36 months.
TECHNICAL DATA:
Power supply: ...................................................24V AC ⁄ DC
CARBON DIOXIDE:
CO2 sensor:........................................................optical sensor (NDIR), non-dispersive infrared technology
Measuring range, CO2:...............................0… 2,000 ppm CO2
Output, CO2:......................................................0-10V
Measuring accuracy, CO2:........................± 30ppm, ± 5% of final value
Pressure dependence: ...............................± 1.6% ⁄ kPa (referred to standard pressure)
Long-term stability:.......................................± 1% of final value per year
Gas exchange:..................................................by diffusion
AIR QUALITY:
Air quality sensor:..........................................VOC sensor (metal oxide)
(VOC = volatile organic compounds)
Measuring range, air quality: ..................0 …100 % (mixed gas pollution referred to calibrating gas)
Output, air quality: .........................................0 -10V (0V= clean air, 10V = polluted air)
Measuring accuracy, air quality:
...........± 20 % of final value (referred to calibrating gas)
Warm-up period: ............................................ca. 1 hour
Ambient temperature:................................0…+50°C
Electrical connection: ..................................0.14 -1.5 mm2via screw terminals on circuit board
Enclosure:...........................................................plastic, material polyamide, 30% glass-globe-reinforced,
with quick-locking screws colour pure white (similar RAL 9010)
Dimensions:.......................................................108 x 72.5 x 70mm
Cable union: .......................................................M16, including strain relief
Protective tube: ..............................................metal, Ø 20 mm, KCO2⁄ KLQ-CO2: nominal length NL= 190mm;
ACO2⁄ ALQ-CO2: nominal length NL=103mm
Process connection: ....................................by mounting flange, plastic, (included in the scope of delivery),
galvanised steel optional
Protection class: ............................................III (according to EN 60 730)
Protection type:..............................................IP 65 according to IEC 529)
Standards:
..........................................................CE conformity, electromagnetic compatibility
according to EN 61326+ A1+ A2, EMC directive 89 ⁄ 336 ⁄ EWG
Optional:...............................................................8-digit display, cutout 36x14 mm (Wx H),
for displaying actual CO2content and actual air quality
Connecting diagram ACO2⁄ KCO2Connecting diagram ALQ - CO2⁄ KLQ - CO2
KCO2
KLQ-CO2
ACO2
ALQ-CO2
ACO2
ALQ-CO2
with display

Dimensional drawing KCO2
KLQ-CO2
Circuit diagram ACO2⁄ KCO2
Circuit diagram ALQ - CO2⁄ KLQ - CO2Dimensional drawing ACO2
ALQ-CO2

Information for installation
Mounting information RCO2 ⁄ KCO2:
The sensor element is connected to the electronic component assembly by a plug connector. When removing the cover and internal
wiring, make sure not to loosen this connector. To connect the electric leads, the terminal is pulled off the component assembly. The
cable is lead through the cable union and connected to the terminal. After tightening the connections, the plug connector is put back
on again (ensure correct polarity!). The connecting cable is carefully pulled back while putting the cover back on and then is fixed by
the cable union. Watch for the wire connections inside the device during mounting.
Automatic calibration of carbon dioxide measurement (default)
The device calibrates itself at an interval of 7 days. To ensure this function, the device needs to be supplied with fresh air (CO2content
300 ppm...400 ppm) at least for 10 minutes during each 7-day period. For self-calibration, the devices memorises device-internally the
CO2content minimum value measured during a 7-day period. After 7 days, this minimum value is standardised to 350 ppm CO2and
the output signal is corrected accordingly. The maximum amount of correction is here limited to 40 ppm ⁄interval.
Manual calibration of carbon dioxide measurement
Manual calibration can be started independently from the position of jumper J3 by pushing the button. After connecting the device, a
period of at least 10 minutes of continuous operation of the device at fresh air (CO2content 300 ppm...400 ppm) is to be ensured.
Manual calibration of the output signal to 1.75 V (350 ppm = zero-point) is started by pressing the button “Manual calibration CO2“ (for
ca. 5 seconds). Preparing for calibration is indicated by a blinking LED. Setting the output to 1.75 V at actual ambient conditions follows
automatically thereafter. During this phase, the LED is permanently activated. After calibration is completed, the LED is deactivated.
Putting in operation
After switching on the device, a self-test and tempering period follows. This procedure takes 3 to 5 minutes, depending on ambient
conditions. During this time, the output analog voltage differs from the actual measured value.
Connection scheme Parallel operation
Connection scheme Individual operation
SUPPLY VOLTAGE:
For operating voltage reverse polarity protection, a one-way rectifier or
reverse polarity protection diode is integrated in this device variant. This
internal one-way rectifier also allows operating 0 -10 V devices on AC
supply voltage.
The output signal is to be tapped by a measuring instrument. Output vol-
tage is measured here against zero potential (0 V) of the input voltage!
When this device is operated on DC supply voltage, the operating voltage
input UB+ is to be used for 15...36 V DC supply and UB– or GND for
ground wire!
When several devices are supplied by one 24 V AC voltage supply, it is to
be ensured that all ”positive“ operating voltage input terminals (+) of the
field devices are connected with each other and all ”negative“ operating
voltage input terminals (–) (= reference potential) are connected toge-
ther (in-phase connection of field devices). All outputs of field devices
must be referenced to the same potential!
In case of reversed polarity at one field device, a supply voltage short-cir-
cuit would be caused by that device. The consequential short-circuit cur-
rent flowing through this field device may cause damage to it.
Therefore, pay attention to correct wiring!

Information for installation
General notes on RLQ2-CO2 ⁄ KLQ-CO2:
Automatic calibration of air quality (default)
The minimum initial value for air quality is memorized within a period of ca. 4 weeks. After that period has lapsed, the output signal is
standardised to zero-point (1.0 V). The maximum amount of correction is thereby limited to 1 V⁄ interval. In this way, long-term drifts
and operational aging effects of the sensor element are completely eliminated.
Manual calibration of air quality
Manual calibration can be started independently from the position of jumper J2 by pushing the button. After connecting the device,
a period of at least 2 hours of continuous operation of the device at “normal“ air quality is to be ensured. Manual calibration of the
output signal to 1 V (zero-point) is started by pressing the button “Manual calibration“ (for ca. 5 seconds). Preparing for calibration is
indicated by a blinking LED. Setting the output to 1 V at actual ambient conditions follows automatically thereafter. During this phase,
the LED is permanently activated. After calibration is completed, the LED is deactivated.
General information of air quality
Due to its functional principle, the lifetime of the sensor depends on nature and concentration of the pollutant gas burden. The sensitive
layer of the sensor element reacts with all volatile organic compounds and is thereby modified in its electrical properties or “exhausted“.
This process results in a displacement of the characteristic curve. Such characteristic curve displacement however amounts to less
than 15 % ⁄year under normal burden. In measuring air quality, the general condition of air quality is detected. Whether air quality is
“good“ or “bad“ is differently interpreted by each person. Different pollution burdens and concentrations influence the air quality signal
(0..10 Volt) in different ways. Examples for this are cigarette smoke, deodorant sprays, cleaning agents, or also various adhesive ma-
terials for floor and wall coverings as well as dyestuffs. Increased burdens e.g. by solvents, nicotine, hydrocarbons, aerosol propellants
etc. intensify consumption ⁄ aging of the sensor element. Particularly under high pollutant gas burdens – also during non-operational
idle state periods of the devices (transport and storage) – zero-point drift will occur. Consequently, this must be corrected at site
according to the respective circumstances or basic burdens. Air quality measuring instruments of different manufacturers cannot
directly be compared because of different functional principles, preset basic burdens (zero-point), and permitted burdens (amplification
⁄ sensitivity). Devices are preset respectively calibrated according to the sensor manufacturer‘s specifications. Here, a zero-point and a
final value is determined and thus a maximum burden. In particular cases, exceeding measuring ranges or excessive basic burdens on
the devices will occur (outgassing floor carpeting, wall paint, etc.). In order to enable distinguishing different air qualities, devices need
to be adjusted by the customer according to the conditions existing on site that do not correlate to the factory-preset definition range
and calibration. Please note that factory calibration is thereby lost and compliance with technical data can no longer be guaranteed.
Automatic calibration of carbon dioxide measurement (default)
The device calibrates itself at an interval of 7 days. To ensure this function, the device needs to be supplied with fresh air (CO2content
300 ppm...400 ppm) at least for 10 minutes during each 7-day period. For self-calibration, the devices memorises device-internally the
CO2content minimum value measured during a 7-day period. After 7 days, this minimum value is standardised to 350 ppm CO2and
the output signal is corrected accordingly. The maximum amount of correction is here limited to 40 ppm ⁄ interval.
Manual calibration of carbon dioxide measurement
Manual calibration can be started independently from the position of jumper J3 by pushing the button. After connecting the device, a
period of at least 10 minutes of continuous operation of the device at fresh air (CO2 content 300 ppm...400 ppm) is to be ensured.
Manual calibration of the output signal to 1.75 V (350 ppm = zero-point) is started by pressing the button “Manual calibration CO2“
(for ca. 5 seconds). Preparing for calibration is indicated by a blinking LED. Setting the output to 1.75 V at actual ambient conditions
follows automatically thereafter. During this phase, the LED is permanently activated. After calibration is completed, the LED is deac-
tivated. Air quality is measured by a chemical sensor.

General notes
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 additionIn addition, the following points are to be observed:
- These instructions must be read before installation and putting in operation and all notes provided therein are to be regarded!
- Devices must only be connected to safety extra-low voltage and under dead-voltage condition. To avoid damages and errors the
device (e.g. by voltage induction) shielded cables are to be used, laying parallel with current-carrying lines is to be avoided, and
EMC directives are to be observed.
- 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.
- These devices must be installed by authorised specialists only.
- 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 irradiation 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 solely 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 enclosures or enclosure accessories may show slight tolerances on the specifications provided in these instruc-
tions.
- Modifications of these records are not permitted.
- In case of a complaint, only complete devices returned in original packing will be accepted.
Notes regarding KCO2and RCO2
- This device may only be used in non-precipitating air without above-atmospheric or below-atmospheric pressure at the sensor
element.
- The voltage output is short-circuit proof.
- Applying overvoltage will destroy the device.
- In case of pollution, we recommend cleaning and recalibration in the factory.
- The device operating range covers 10...95% relative humidity respectively 0...50 °C.
Outside of that range, mismeasurements or increased deviations will occur.
- The device calibrates itself at an interval of 7 days. To ensure this function, the device needs to be supplied with fresh air (CO2
content 300 ppm...400 ppm) at least for 10 minutes during each 7-day period.
- If this device is operated beyond the specified range, all warranty claims are forfeited.
ATTENTION! The minimum CO2concentration of outdoor air amounts to ca. 350 ppm (output voltage = 1.75 V) in leafy, hardly industri-
alized areas. A sensor self-test is initiated by above-atmospheric or below-atmospheric pressure or by exposure of the sensor to more
than 5000 ppm CO2. The output voltage (CO2output) amounts to ca. 0.2 Volt during the self-test. Gas inter-exchange in the sensor
element happens by diffusion. Depending on changes in the CO2concentration and flow velocity of the air surrounding the sensor,
the reaction of the device to changes in CO2concentration may appear with a delay. It is absolutely necessary to choose the device
mounting position so that the air stream “presses” into the duct tube. Otherwise, below-atmospheric pressure will develop in the duct
tube that may cause a substantial slow down of gas exchange or even prevent it.
These instructions must be read before installation and putting in operation and all notes provided therein are to be re-
garded!
1382 III ⁄ 08  © Copyright by S+S Regeltechnik GmbH · Reprints, in part or in total, are only permitted with the approval of S+S Regeltechnik GmbH.