10
G
AERASGARD
®
RCO
2
- W ⁄ RLQ - CO
2
- W ⁄ RFTM - LQ - CO
2
- W ⁄ RTM - CO
2
- SD
Rev. 2019 - V29
The maintenance-free microprocessor-controlled room sensor
AERASGARD
®
RTM - CO
2
- SD
with automatic calibration (fixed) is used for detecting the
CO
2
content of the air within a range of 0...2000 ppm and the temperature within a range of 0...+50°C. The measured values are converted into
standard signals of 0 -10 V.
The maintenance-free microprocessor-controlled room sensor
AERASGARD
®
RFTM - LQ
- CO
2
- W
and
RCO
2
- W
/
RLQ - CO
2
- W
with automatic calibration
(can be deactivated via DIP switches) is used for detecting the overall room climate. It measures CO
2
within a range of 0...2000 ppm or 0...5000 ppm, air
quality (VOC) in one of three sensitivity levels that can be selected LOW / MEDIUM (default) / HIGH, temperature within a range of 0...+50°C as well as
relative humidity of 0...100 % r.H. The measured values are converted into standard signals of 0 -10 V oder 4...20 mA (selectable via DIP switches). As an
option, the measured values can be shown continuously in the illuminated display.
Elegant housing made of plastic, with snap-on lid, base with 4-hole attachment, for installation on vertically or horizontally installed in-wall flush boxes, with
predetermined breaking point for on-wall cable entry.
The relative humidity (% r.H.) quotient of water vapour partial pressure divided by the saturation vapour pressure at the respective gas temperature. A
digital, long-term stable sensor used as measuring element for relative air humidity and temperature guarantees exact measurement results. The air
quality is determined based on a (VOC) gas mixture sensor. The CO
2
content of the air is measured using an optical NDIR sensor (non-dispersive infra-red
technology).
TECHNICAL DATA
Voltage supply:
24 V AC ⁄ DC (± 10 %)
Power consumption:
RCO
2
- W ⁄ RTM - CO
2
- SD
:
< 1.5 W ⁄ 24 V DC typical; < 2.9 VA ⁄ 24 V AC typical; peak current 200 mA
RLQ - CO
2
- W ⁄ RFTM - LQ - CO
2
- W
:
< 4.4 W ⁄ 24 V DC typical; < 6.4 VA ⁄ 24 V AC typical; peak current 200 mA
Outputs:
RTM - CO
2
- SD
0 -10 V (fixed)
Rxx - CO
2
- W
0 -10 V
or
4...20 mA, working resistance < 800 Ω
(selectable via DIP switches, selected variant applies for all outputs),
with offset potentiometer (± 10 % of the measuring range)
Relay output:
RTM - CO
2
- SD
without changeover contact
Rxx - CO
2
- W
with potential-free
changeover contact
(24 V / 1 A)
(assignment selectable via DIP switches, switchpoint adjustable)
HUMIDITY
Sensors:
digital humidity sensor with integrated temperature sensor,
low hysteresis, high long-term stability
Measuring range, humidity:
0...100 % r. H.
Operating range, humidity:
0...95 % r. H. (without dew formation)
Deviation, humidity:
typically
± 2.0 %
(20...80 % r. H.) at +25 °C, otherwise ± 3.0 %
Output, humidity:
0 -10 V
or
4...20 mA (selectable via DIP switches)
TEMPERATURE
Measuring range, temperature:
0...+ 50 °C
Operating range, temperature:
0...+ 50 °C
Temperature deviation:
typically ± 0.2 K at +25 °C
Output, temperature:
RTM - CO
2
- SD
0 -10 V (fixed)
Rxx - CO
2
- W
0 -10 V
or
4...20 mA (selectable via DIP switches)
AIR QUALITY (VOC)
Sensor, VOC :
VOC sensor (metal oxide) (VOC = volatile organic compounds),
with manual calibration (via zero button) and
with automatic calibration (can be deactivated via DIP switches)
Measuring range, VOC :
0...100 % air quality; referred to calibrating gas;
multi-range switching
(selectable via DIP switches)
VOC sensitivity low, medium, high
Output, VOC :
0 -10 V (0 V = clean air, 10 V = polluted air)
or
4...20 mA (selectable via DIP switches,
switchpoint can be adjusted from 0...100 % of the output signal)
Measuring accuracy, VOC :
typically ± 20 % of final value (referred to calibrating gas)
Service life:
> 60 months (under normal load conditions)
CARBON DIOXIDE (CO
2
)
Sensor, CO
2
:
optical NDIR sensor (non-dispersive infra-red technology),
with manual calibration (via zero button),
RTM - CO
2
- SD
with automatic calibration (fixed)
Rxx - CO
2
- W
with automatic calibration (can be deactivated via DIP switches)
Measuring range, CO
2
:
RTM - CO
2
- SD
0...2000 ppm (fixed)
Rxx - CO
2
- W
0...2000 ppm
or
0...5000 ppm (selectable via DIP switches)
Output, CO
2
:
RTM - CO
2
- SD
0 -10 V (fixed)
Rxx - CO
2
- W
0 -10 V
or
4...20 mA (selectable via DIP switches)
Measuring accuracy, CO
2
:
typically ± 30 ppm ± 3 % of measured value
Temperature dependence, CO
2
:
± 5 ppm ⁄ °C or ± 0.5 % of measured value ⁄ °C
(whichever is higher)
(continued on next page!)
