10
G
AERASGARD
®
RCO2 - W ⁄ RLQ - CO2 - W ⁄ RFTM - LQ - CO2 - W ⁄ RTM - CO2 - SD
Rev. 2021 - V31
Maintenance-free room sensor
AERASGARD
®
RTM - CO2 - SD
with active output, automatic calibration, in an elegant plastic housing with snap-on
lid, for determining the CO2 content 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 -10 V.
Maintenance-free room sensor
AERASGARD
®
RFTM - LQ
- CO2 - W
with active/switching output, automatic calibration, in an elegant plastic housing
with snap-on lid, optionally with/without display, for determining the CO2 content of the air (0...2000 ppm/0...5000 ppm), the quality in three VOC
sensitivity (0…100 % VOC), 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 -10 V 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. One sensor for every 30 m² of
space is recommended.
A long-term stable,
digital humidity and temperature sensor
guarantees exact measurement results. The CO2 measurement 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, etc. As an alternative, use IAQ categories (from excellent to unhealthy) following the guidelines of the German Federal Environ-
mental Agency to assess the room air.
TECHNICAL DATA
Voltage supply:
24 V AC ⁄ DC (± 10 %)
Power consumption:
RCO2 - W ⁄ RTM - CO2 - SD
:
< 1.5 W ⁄ 24 V DC typical; < 2.9 VA ⁄ 24 V AC typical; peak current 200 mA
RLQ - CO2 - W ⁄ RFTM - LQ - CO2 - W
:
< 4.4 W ⁄ 24 V DC typical; < 6.4 VA ⁄ 24 V AC 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
Sensor (RH / °C):
digital humidity sensor with integrated temperature sensor,
low hysteresis, high long-term stability
Measuring range (RH):
0...100 % r. H.
Output (RH):
0 -10 V or 4...20 mA (selectable via DIP switches)
Deviation (RH): typically
± 2.0 %
(20...80 % r. H.) bei +25 °C, sonst ± 3.0 %
TEMPERATURE
Measuring range (°C):
0...+ 50 °C
Deviation (°C):
typically ± 0.2 K bei +25 °C
Output (°C):
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 automatic calibration (permanently active)
Measuring range (VOC):
0...100 % air quality; referred to calibrating gas;
multi-range switching
(selectable via DIP switches)
VOC sensitivities (low/medium/high) or IAQ category (Indoor Air Quality)
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 (VOC):
> 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 switchesr)
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)
Pressure dependence (CO2):
± 0.13 % ⁄ mm Hg
Long-term stability (CO2):
< 2 % in 15 years
Gas exchange (CO2):
by diffusion
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