G
Mounting and Installation
Switching thresholds
RTM - CO
2
- 2S
Potentiometers
ATTENTION!
The minimum CO
2
concentration of outdoor air amounts to ca. 350 ppm (output
voltage = 1.75 V) in leafy, hardly industrialized areas. A sensor self-test is initiated
by above-atmospheric or below-atmospheric pressure or by exposure of the
sensor to more than 5000 ppm CO
2
. The output voltage (CO
2
output) amounts to
ca. 0.2 Volt during the self-test. Gas inter-exchange in the sensor element
happens by diffusion. Depending on changes in the CO
2
concentration and flow
velocity of the air surrounding the sensor, the reaction of the device to changes in
CO
2
concentration may appear with a delay. It is absolutely necessary to choose
the device mounting position so that the air stream “presses” into the duct tube.
Otherwise, below- atmospheric pressure will develop in the duct tube that may
cause a substantial slow down of gas exchange or even prevent it.
Putting in operation
After switching on the device, a self-test and tempering period follows. This pro-
cedure takes 3 to 5 minutes, depending on ambient conditions. During this time,
the output analog voltage differs from the actual measured value.
Traffic light indication
RTM - CO
2
- A
LED
CO
2
content
Green 1
< 500 ppm
Green 2
500 - 800 ppm
Yellow
800 - 1200 ppm
Red 1
1200 - 1600 ppm
Red 2
> 1600 ppm
Traffic light indication
RTM - CO
2
- 2S
LED
CO
2
content
Green
< 800 ppm
Yellow
800 - 1200 ppm
Red
> 1200 ppm
Switching thresholds
RTM - CO
2
- 2S
(adjustable)
S1
S2
Lower limit
Upper limit
1
500 ppm
1100 ppm
2
600 ppm
1200 ppm
3
700 ppm
1300 ppm
4
800 ppm
1400 ppm
5 900 ppm
1500 ppm
S1
S2
5
3
4
2 1
5
3
4
2 1
Measuring range CO
2
RFTF - CO
2
(adjustable)
O V
10 V
S1
S2
Lower limit
Upper limit
1
0 ppm
1200 ppm
2
200 ppm
1400 ppm
3
400 ppm
1600 ppm
4
600 ppm
1800 ppm
5
800 ppm
2000 ppm
Measuring range CO
2
RFTF - CO
2
Potentiometers
S1
S2
5
3
4
2 1
5
3
4
2 1
Type ⁄ WG1
Measuring Range
CO
2
Temperature
Humidity
Output
Features
Item No.
RFTF - CO
2
(3x)
without traffic light
RF T F - C O2
0...2000 ppm
+5 ...+ 40 °C
30...80 % r. H.
0 -10 V
–
1501-4116-1001-000
RTM - CO
2
(2x)
without traffic light
R T M - C O2
0…2000 ppm
0 ...+ 50 °C
–
0 -10 V
–
1501-6112-1000-000
R T M - C O2 VA
0…2000 ppm
0 ...+ 50 °C
–
0 -10 V
Stainless steel enclosure
1501-4112-1000-005
RTM - CO
2
(2x)
with traffic light
R T M - C O2-A
0…2000 ppm
0 ...+ 50 °C
–
0 -10 V
5x LED
1501-6112-1030-000
R T M - C O2-2S
0…2000 ppm
+5 ...+ 40 °C
–
0 -10 V
3x LED, 2x Normally open contact
1501-4112-1060-000
A
= With “traffic light” (five coloured LEDs) indicating air quality (VOC).
Note:
This unit
must not
be used as safety-relevant device!
