11979G JUN 22
CTRTA(-D)
2
INSTRUCTION CTRTA(-D)
CO
2
and temperature transmitter for wall
mounting
Room transmitters for measuring carbon dioxide concentration in
indoor environments. The transmitter has a built-in CO
2
sensor with
measuring range 0…2000 ppm and output signal 0…10 V, as well
as built-in 0…10 V and PT1000 temperature sensors (measuring
range 0…50°C).
-D models have an LCD display showing CO
2
concentration and
temperature in an alternating series.
Technical data
Supply voltage
24 V AC/DC (21.6…26.4 V AC /
15…35 V DC)
Power consumption
< 2.5 W
Energy consumption < 0.5 Wh
Transformer power
5 VA
Electrical connection
Screw terminals max. 1.5 mm
2
(AWG 16)
Ambient temperature
0…50°C
Ambient humidity
10…90 % RH non-condensing
Storage temperature
-25…+60°C
Protection class
IP30
Dimensions (WxHxD)
85 x 100 x 30.5 mm
CO
2
Output signal CO
2
0...10 V DC referring to 0…2000 ppm
Measuring range
0…2000 ppm
Accuracy at 20°C
< ± (50 ppm + 2 % of the measured
value)
Temp. influence
Typically 5 ppm / K
Long term stability
Typically 20 ppm / year
Time constant
< 90 s
Warmup time
< 5 min
Temperature (0...10 V)
Temperature sensor
0…10 V DC referring to 0…50°C
Measuring range
0…50°C
Accuracy ±0.4°C
Temperature (PT1000)
Temperature sensor
PT1000 class DIN B
Measuring range
0…50°C
Accuracy
±0.3°C
Installation
The transmitter should be mounted in a location with good air
circulation where it can be expected to give a representative reading.
It may be mounted on a wallbox or directly on the wall.
To remove the front cover, press the locking tongue in the lower part
of the casing using a 3 mm flat-blade screwdriver (
figure 1
). Press
and twist the screwdriver and at the same time pull the bottom part
of the front outwards (
figure 2-4
). When the bottom end of the front
is free from the bottom part of the casing, slide the cover towards the
top of the casing to free the hooks holding the upper edge of the front
cover (
figure 5
).
Perform the connections according to the electrical wiring diagram
(
figure 7
). Note: GND and G0 are internally connected.
Screw the bottom part of the casing to the wall.
Regin CO
2
Background Calibration (RCBC)
The Regin CO
2
Background Calibration function, or RCBC, is a
function that can be activated to get a more stable CO
2
level in a
room that is not used for parts of a day.
The lowest reading each day is saved, and every 7 days these
readings are checked and may be adjusted up or down depending on
the CO
2
level.
In order for the function to work properly, the room must be well
ventilated and should be empty for atleast 4 hours per day.
The RCBC function should not be used for rooms that are in use 24
hours a day, like greenhouses and hospital rooms.
Startup
After applying power to the transmitter, it will be a few minutes before
it starts to show correct CO
2
values.
Note!
The PT1000 sensor is not compensated for internal warm-up.
The passive temperature output must be calibrated with a controller.
Calibration
The transmitter is calibrated before delivery and does not need to be
calibrated at installation. It is calibrated automatically, which means
that manual recalibration is not required during the lifetime of the
transmitter.
Configuration of RCBC
Use dip switch 1 and 2 to select which action to perform. Changing
dip switch position creates an action for the RCBC algorithm.
The unit is delivered with the dip switches in position OFF. The
RCBC algorithm is not activated and the parameters are reset.
To activate the RCBC algorithm, put both dip switch 1 and 2 in
position ON.
1
2
ON
Fig. 9
To deactivate the RCBC algorithm, put dip switch 2 in position OFF
and do not touch dip switch 1.
1
2
ON
Fig. 10
To reset the RCBC parameters and deactivate the RCBC algorithm,
put both dip switch 1 and 2 in position OFF.
1
2
ON
Fig. 11
Note!
if the RCBC algorithm is deactivated (see Fig. 10), the
current correction is not applied to the CO
2
reading, but the value
is still in the memory and saved in the EEPROM. As soon as
the RCBC algorithm is activated again, the correction is applied
immediately at the next sensor reading.
This product carries the CE mark.
More information is available at www.regincontrols.com.
Contact
AB Regin, Box 116, 428 22 Kållered, Sweden
Tel: +46 31 720 02 00, Fax: +46 31 720 02 50
www.regincontrols.com, [email protected]
i
i
Read this instruction before installation and wiring of the
product. Subject to change without notice.
EN
Caution!
The CO
2
sensor must not be subjected to any
kind of mechanical impact as this will cause the sensor
to give faulty readings.