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Sensorics Application Air quality sensors RLQ
maintenance-free CO 2 measurement
measured variables like temperature,
humidity, CO 2 and dew point in one product
high energy saving potential by ventilation
adapted to people´s needs
easy retrofitting as stand-alone solution

Maintenance-free
Room quality sensors from
ELKA are maintenance-free.
The devices are equipped with
precise bi-directional infrared
measuring cells and work according
to the principle of nondispersive
infrared technology
(NDIR). Compared to common
processes, long-term stable
measuring values can be established.
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Lüfter
Sensors RLQ Characteristics
Bedienung
Solution 1 Solution 2 Solution 3
Steuerung
Solution 1: optical and acoustic memory of the ventilation process
One coloured LED at the CO 2 sensor indicates the carbon dioxide concentration in the air:
GREEN = good air, YELLOW = bad air, RED = unhealthy air quality. In addition to the yellow
and red light, an acoustic signal can be set to remind people to ventilate the room.
This version of controlled ventilation only requires the installation of an air quality sensor and
an introduction of the room users into the correct ventilation behaviour under consideration of
basic energetic conditions.
Solution 2: Intermittent control of a fan
(DIN EN 13779 Category IDA-C6)
The CO 2 sensor measures the carbon dioxide concentration in the room. Via an integrated
digital output and a series relay the sensor controls a ventilation system (ON/OFF) providing
the room with fresh air from outside. This type of ventilation is very energy-efficient if heat is
extracted from the air lead out by a heat exchanger to preheat the fresh air blown in.
Solution 3: Constant control of a fan
The CO 2 sensor measures the carbon dioxide concentration in the room. The measured
values are sent to the ventilation system via an integrated analog output (0...10 V) and form
the setpoint value for the speed regulation of the fan. Rule: the higher the concentration,
the higher the fan speed and thus the air exchange rate.
Solution 4: Opening a window depending on the CO 2 concentration
The CO 2 sensor measures the carbon dioxide concentration in the room and sends the
measured values via a digital output to the electronic window control. When the critical
concentration is exceeded, the window is opened by a motor and closed when the critical
concentration is underpassed. This automatic batch ventilation is a favourably-priced
alternative to a retrofitted ventilation system.
Solution 4
Fenster

Did you know? Technical data
Carbon dioxide is a natural element
of the earth’s atmosphere. The CO 2
concentration in the open air varies
between 360 ppm (parts per million)
in rural areas and 500 ppm in urban
areas. According to DIN EN 13779
the maximum admissible value for
interior rooms is 1500 ppm.
During rather intellectual activity,
people emit about 18 litres of CO 2
per hour through breathing and the
skin. In non-residential buildings
three essential factors influence the
quality of the room air:
- the size of the room
- the number of persons
- the building substance
Especially in school classrooms and
offices you can feel the effect of
increased carbon dioxide values in
the air. There is a drop in concentration
and productivity, people feel
more tired, have an increased sense
of smell and their well-being is clearly
reduced.
According to tests in German
schools, the admissible limit values
for CO 2 concentration in the air are
already exceeded in the first lesson
and stay high for the rest of the day.
Technical data: General
• Supply : 24 V DC ± 10 %
max. 160 mA
• Signal output: 24 V DC /
0,9 A @ 25 °C
• Analog output: 0…10 V DC
(load > 1 kΩ)
• Housing colour: pure white
• Protetction type: IP 30
• Dimensions: 74 x 74 x 28 mm
• Mounting: surface-mounted or
on a Ø 60 mm
installation box
Configuration is effected via a USB-socket
at the device. The software required can be
donwloaded free of charge at www.elka.de.
Technical Data: Sensors
Carbon dioxide (CO 2) sensor
• Measuring process:maintenance-free
bi-directional infrared
photometer principe (NIDR)
• Sensor: bi-directional infrared
measuring cell
• Measuring principe:non-dispersive infrared
technology (NIDR)
• Measuring range
Analog output: 0…10 V = 0…2000 ppm
Digital output: 24 V DC / 0,9 A
• Traffic light function via LED (green, yellow,
red)
• Acoustic transducer
Humidity sensor
• Measuring range: 10…95 % r. F
• Output variables
Analog output: 0…10 V = 0…100 % r. F.
Digital output: dew point 24 V DC / 0,9 A
• Integrated dew point calculation
• Acoustic transducer
Temperature sensor
• Measuring range: 0…50 °C
• Output variables
Analog output: 0…10 V = 0…50 °C
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Types and prices
Type
RLQ.C-10R
RLQ.CTF-10R CO2 RLQ.TF-10R
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Measuring
variable
CO2 Relative humidity
Dew point
Temperature
Relative humidity
Dew point
Temperature
Output signal
Digital output
0…10 V
Digital output
0…10 V
0…10 V
Digital output
0…10 V
0…10 V
Digital output
0…10 V
Display
LED
LED
LED
* Price/pc in EUR, ex works Lüdenscheid, uninsured, plus postage, packaging and VAT.
Subject to modifications.
Art.-No.
110 01 601
110 01 602
110 01 603
Price*
219,00
259,00
139,00
Download
Use our online service. On www.elka.de
technical data and advertisement texts of
our products are available for download.
ELKA-Elektronik GmbH
Wefelshohler Straße 35
D-58511 Lüdenscheid
Telephone +49 (0) 2351 176-1860
Fax +49 (0) 2351 176-1780
sales@elka.de
www.elka.de
© 2009 ELKA-Elektronik GmbH Application “Air quality sensors RLQ” release 11/2009