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INSTRUCTION CTHRA(-D)
EN
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Read this instruction before installation and wiring of the
product. Subject to change without notice.
CO
, humidity and temperature transmitters
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for wall mounting
Room transmitters for measuring carbon dioxide concentration in
indoor environments. The transmitter has a built-in CO
output signal 0...10 V, a built-in temperature sensor which provides
a 0...10 V signal in the range 0...50°C, as well as a 0...10 V output
signal for relative humidity.
-D models have an LCD display showing CO
perature and humidity in an alternating series.
Caution! The CO
sensor must not be subjected to any
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kind of mechanical impact as this will cause the sensor
to give faulty readings.
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
(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
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Output signal CO
0...10 V DC referring to 0...2000 ppm
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Working 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
Output signal temperature
Working range
Accuracy
Humidity
Output signal humidity
Working range
Accuracy at 20°C
Installation
The transmitter should be mounted in a location with good air circula-
tion where it can be expected to give a representative reading. It may
sensor with
be mounted on a wallbox or directly on the wall.
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To remove the front cover, depress the locking tongue in the lower
part of the casing using a 3 mm flat-blade screwdriver (picture 1).
Press and twist the screwdriver and at the same time pull the bottom
concentration, tem-
part of the front outwards (pictures 2-4). When the bottom end of
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the front is free from the bottom part of the casing, slide the cover to-
wards the top of the casing to free the hooks holding the upper edge
of the front cover (picture 5).
Perform the connections according to the electrical
(picture 7). Note: GND and G0 are internally connected.
Screw the bottom part of the casing to the wall.
Regin CO
The Regin CO
tion that can be activated to get a more stable CO
that is not used for parts of a day.
The lowest reading each day is saved, and every 7 days these read-
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ings are checked and may be adjusted up or down depending on the
CO
level.
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In order for the function to work properly, the room must be well ven-
tilated 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
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.
0...10 V DC referring to 0...50°C
0...50°C
±0.4°C
0...10 V DC referring to 0...100 % RH
10...90 % RH
±3 %
wiring diagram
Background Calibration (RCBC)
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Background Calibration function, or RCBC, is a func-
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level in a room
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values.
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CTHRA(-D)
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.
ON
1
2
Fig. 9
To deactivate the RCBC algorithm, put dip switch 2 in position OFF
and do not touch dip switch 1.
ON
1
2
Fig. 10
To reset the RCBC parameters and deactivate the RCBC algorithm,
put both dip switch 1 and 2 in position OFF.
ON
1
2
Fig. 11
Note! if the RCBC algorithm is deactivated (see Fig. 10), the
current correction is not applied to the CO
reading, but the value
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is still in the memory and saved in the EEPROM. As soon as the
RCBC algorithm is activated again, the correction is applied imme-
diately 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, info@regin.se
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