
GAERASGARD®RCO2- W ⁄ RLQ - CO2- W ⁄ RFTM - LQ - CO2- W ⁄ RTM - CO2- SD
Rev. 2020 - V30
Maintenance-free room sensor
AERASGARD
®
RTM - CO2- SD
with active output, automatic calibration (fixed), in an elegant plastic housing with
snap-on lid, for determining the CO2content of the air (0...2000 ppm) and the temperature (0...+50°C). The measuring transducer converts the
measured values into a standard signal of 0 -10V.
Maintenance-free room sensor
AERASGARD
®
RFTM - LQ - CO2- W
with active/switching output, automatic calibration (can be deactivated, in an
elegant plastic housing with snap-on lid, optionally with/without display, for determining the CO2content of the air (0...2000 ppm/0...5000 ppm), the
quality in three VOC sensitivity levels (low/medium/high), the temperature (0...+50°C) as well as the relative air humidity (0…100 % r.H). The
measuring transducer converts the measured values into a standard signal of 0 -10V or 4...20 mA (switchable).
The sensor is used in offices, hotels, convention centres, apartments, shops, etc. for the purpose of evaluating the indoor climate. This enables
energy-saving room ventilation on an as-needed basis, thereby reducing operating costs and improving well-being. A long-term stable,
digital humidity
and temperature sensor
guarantees exact measurement results.
The CO2measurement is performed using an optical
NDIR sensor
(non-dispersive infra-red technology). The detection range is calibrated for
standard applications such as monitoring residential rooms and conference rooms. The air quality is detected by a
VOC sensor
(mixed gas sensor
for volatile organic substances). This sensor determines the loading of the room air due to contaminated gases such as cigarette smoke, body
perspiration, exhaled breathing air, solvent vapours, emissions from building components, etc. With regard to the expected air contamination, low,
medium or high VOC sensitivity can be selected.
TECHNICAL DATA
Voltage supply: 24 V st ⁄ ss (± 10 %)
Power consumption:
RCO2- W ⁄ RTM - CO2- SD :
< 1.5 W ⁄ 24 V ss typical; < 2.9 VA ⁄ 24 V st typical; peak current 200 mA
RLQ - CO2- W ⁄ RFTM - LQ - CO2- W :
< 4.4 W ⁄ 24 V ss typical; < 6.4 VA ⁄ 24 V st typical; peak current 200 mA
Outputs:
RTM - CO2- SD
0 -10 V (fixed)
Rxx- CO2- 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 - CO2- SD
without changeover contact
Rxx- CO2- 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 - CO2- SD
0 -10 V (fixed)
Rxx- CO2- 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)
depending on the type of loading and gas concentration
CARBON DIOXIDE
(CO2)
Sensor, CO2: optical NDIR sensor (non-dispersive infra-red technology),
with manual calibration (via zero button),
RTM - CO2- SD
with automatic calibration (fixed)
Rxx- CO2- W
with automatic calibration (can be deactivated via DIP switches)
Measuring range, CO2:
RTM - CO2- SD
0...2000 ppm (fixed)
Rxx- CO2- W
0...2000 ppm
or
0...5000 ppm (selectable via DIP switches)
Output, CO2:
RTM - CO2- SD
0 -10 V (fixed)
Rxx- CO2- W
0 -10 V
or
4...20 mA (selectable via DIP switches)
Measuring accuracy, CO2: typically ± 30 ppm ± 3 % of measured value
Temperature dependence, CO2: ± 5 ppm ⁄ °C or ± 0.5 % of measured value ⁄ °C
(whichever is higher) (continued on next page!)