G
AERASGARD
®
RTM - CO
2
Rev. 2017 - V21 GB
The maintenance-free, microprocessor-controlled
AERASGARD
®
RTM - CO
2
is used
to detect the CO
2
content in air within a range of 0 ppm to 2000 ppm CO
2
. The
actual temperature is also measured at the same time. The measurement signals
are converted to standard signals of 0 - 10 V. Optionally, this CO
2
measuring trans-
ducer can be supplied with switching output. Elegant enclosure 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, or in enclosures made of stainless steel (top and bottom part are of stainless
steel, the lid is screwed on), vandalism-secure version e.g. for schools, military
barracks, and public buildings.
The CO
2
content of the air is determined by an optical NDIR sensor (non-dispersive
infra-red technology). The detection range of this CO
2
sensor is calibrated for stand-
ard applications such as monitoring of residential rooms or conference rooms. Room
ventilation on an as-needed basis, improvement of well-being and customer benefit,
increased comfort as well as a reduction of operating costs by energy conservation
are just some of the benefits of employing AERASGARD
®
CO
2
sensors
TECHNICAL DATA
Power supply:
24 V AC ⁄ DC
CARBON DIOXIDE (CO
2
)
Sensor, CO
2
:
optical NDIR sensor
(non-dispersive infra-red technology)
dual-beam measuring system
with automatic calibration
Measuring range, CO
2
:
0...2000 ppm
at the
RTM - CO
2
- 2S
the operating
modecan be changed via pushbutton:
Automatic, Manual (Step 1 and Step 2), and OFF
Output, CO
2
:
0 -10 V
Measuring accuracy, CO
2
:
± 70 ppm plus 5 % of measured value
Pressure dependence:
± 1.6 % ⁄ kPa (referred to standard pressure)
Long-term stability:
± 1 % of final value per year
Gas exchange:
by diffusion
TEMPERATURE
Measuring range,
0...+50 °C (RTM - CO
2
⁄ RTM - CO
2
- A)
temperature:
+5...+40 °C (RTM - CO
2
- 2S)
Output, temperature:
0 -10 V
Deviation, temperature:
± 0.2 K at +25 °C
Warm-up time:
approx. 1 hour
Ambient temperature:
0 …+50 °C
Response time:
approx. 1 minute
Electrical connection:
0.14 - 1.5 mm
2
, via screw terminals
Enclosure:
plastic, material ABS,
colour pure white (similar to RAL 9010), stainless steel enclosure optional
Dimensions:
98 x 98 x 33 mm (Baldur 2)
100 x 100 x 25 mm (stainless steel enclosure)
Installation:
wall mounting or on in-wall flush box, Ø 55 mm,
base with 4-hole for mounting on vertically or horizontally
installed in-wall flush boxes for cable entry from the back,
with predetermined breaking point for on-wall cable entry
from top ⁄ bottom in case of plain on-wall installation
Protection class:
III (according to EN 60 730)
Protection type:
IP 30 (according to EN 60 529)
Standards:
CE conformity, electromagnetic compatibility according to EN 61 326,
EMC directive 2014 ⁄ 30 ⁄ EU, low-voltage directive 2014 ⁄ 35 ⁄ EU
Connecting diagram
RTM - CO
2
RTM - CO
2
- A
Connecting diagram
RTM - CO
2
- 2S
1
2
3
4
5
6
7
8
9
UB+ 24V AC/DC
UB- 24V AC/DC
Free
Free
GND
Free
Free
Output CO
2
content in ppm 0-10V
Output temperature in °C 0-10V
1
2
3
4
5
6
7
8
9
10
11
12
UB+ 24V AC/DC
UB- GND
Free
GND
GND
Free
Output 0-10 V temperature in °C
Output 0-10 V CO
2
content in ppm
Step 2 (normally open contact) 5A/250V~
Step 2 (normally open contact) 5A/250V~
Step 1 (normally open contact) 5A/250V~
Step 1 (normally open contact) 5A/250V~
