Werbung
Verfügbare Sprachen
Verfügbare Sprachen
EN
INSTRUCTION CTHRC(-D)
i
Read this instruction before installation and wiring of the
product. Subject to change without notice.
CO
, humidity and temperature transmitters
2
for Modbus communication for wall mounting
Room transmitters for measuring carbon dioxide concentration in
indoor environments. The transmitter has a built-in CO
working range 0...2000 ppm, as well as built-in temperature and
humidity sensors.
-D models have an LCD display showing CO
perature and humidity.
Caution! The CO
sensor must not be subjected to any
2
kind of mechanical impact as this will cause the sensor
to give faulty readings.
Technical data
Output signal
Modbus
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
Tranformer 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
2
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
Working range
0...50°C
Accuracy at 20°C
±0.2°C
Humidity
Working range
Accuracy at 20°C
Communication
Type
Factory settings
Baud rate
Parity
Address of unit
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.
2
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).
concentration, tem-
Press and twist the screwdriver and at the same time pull the bottom
2
part of the front outwards (pictures 2-4). When the bottom end of
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 wiring diagram
(picture 7).
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-
2
ings are checked and may be adjusted up or down depending on the
CO
level.
2
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.
Communication settings
The transmitter can communicate with a Modbus master unit. All
parameters and variables are accessible as holding registers and
R/W operations are implemented with function codes (FC=03, 06,
16). Select a suitable timeout between readings, in relation to the
baud rate. A minimum timeout of one second is suitable for 19200
and 9600 baud. For other baud rates, increase the timeout value (2 s
for 4800 baud). To modify the factory settings (listed under Technical
data), see page 2-4.
The RS485-Modbus line has a principal bus to which the various
devices are connected (max. 32 devices). Use twisted pair cables
+ 1 ground wire + shield. Use the twisted pair cable to connect A+
10...90 % RH
±2 %
Modbus RTU
19200 bits/s
Even
1
Background Calibration (RCBC)
2
Background Calibration function, or RCBC, is a func-
2
level in a room
2
CTHRC(-D)
and B- and a single wire for GND, this must be connected to each
device. Connect the shield to ground at a single point, preferably
near the master. The cable must be of the Modbus RS485 data
transmission type. The ends of the cable must be connected to a
120 Ω termination resistance. To fit the 120 Ω to the transmitter
(JP3), see picture 8.
The maximum length of the bus depends on the baud rate and
the cable itself. For a baud rate of 9600, the cable (AVG26 type)
can be up to 1000 m. Any branch lines must not be over 20 m. If a
multiport tap is used for n branches, each branch can be up to 40
m divided by n. To increase the number of devices on the line or in-
crease the length of the cables, a signal repeater must be installed.
Add a signal repeater for each group of 32 connected devices.
RCBC
When not using the RCBC function, the value in register 4002 is
read.
When using the RCBC function:
•
Write to register address 4020:
- Turn on RCBC = Write 10608
- Turn off RCBC = Write 13608
- Reset RCBC = Write 21217
•
Read value of register 4002.
Address* Description
Min.
3999
Humidity**
0
4000
Temperature**
0°C
4001
CO
***
0
2
4020
RCBC action
-
4023
Humidity correction****
-100
4024
Temperature correc-
-90
tion***
4025
CO
correction****
-200
2
*)
Holding register address
**)
The displayed value for temperature and humidity is
multiplied by 10 (example: value read by transmitter =
21.3°C → value read by Modbus = 213).
***)
The CO
value read from the sensor and corrected.
2
****)
The parameter is added to the sensor value.
If the sensor is broken, the temperature displayed corresponds to
the values in the table below:
Broken sensor
Modbus value
Corresponding value
Humidity
0
0
Temperature
-20 °C
-2.0°C
CO
0
0
2
Max.
R/W
1000
R
500°C
R
2000
R
-
R/W
100
R/W
90
R/W
200
R/W
5
Werbung
