CHUNDE TECHNOLOGY CH-CO Safety guide

Connection
Terminal
Function Electrical Data Remark
G+
G0
Power (+)
Ground (-)
24 vac/dc + (+-20%), 2w
24 vac/dc - System Voltage Ref.
M
Vo
Io
Signal Ground
Voltage output
Current output
0 – 10V
4 – 20mA
Connected to GND
0 – 20 vol.% CO2
0 – 20 vol.% CO2
Cal Calibration Active when S/C to M Push on function
Table 1. Electrical terminal connections for CH-CO2
WARRANTY AND LIMITATION OF LIABILITY
1. Telasia warrants that for a period of twelve (12) months following receipt by Buyer the
Product supplied by Telasia to the Buyer will be, under normal use and care, free from defects
in workmanship or material and to be in material conformity with Telasia's specifications.
Units returned to Telasia for warranty repairs shall be shipped to Telasia, at Buyer’s expense,
according to Telasia's instruction. Telasia shall replace or repair such units and shall ship them
to Buyer’s designated return destination freight pre-paid within ninety (90) days of the receipt
of product.
2. Warranty Limitations. This warranty does not extend to any unit that has been subjected to
mis-use, neglect or accident; that has been damaged by causes external to the unit; that has
been used in violation of Telasia's instructions; that has been affixed to any non-standard
Accessory attachment; or that has been modified, disassembled, or reassembled by anyone
other than Telasia.
3. The retailer is not responsible for any consequential loss or damages, which may occur by
reason of purchase and use of this product. The warranty is, in any event, strictly limited to
the replacement/repair of the product.
This product is in accordance with the EMC Directive 89/336/EEC and
the Low Voltage Directive 73/23/EEC including amendments by the
CE-marking Directive 93/68/EEC. The product fulfils the following demands:
EN50081-1, EN55011(B)
EN50082-2, EN61000-4-2,-3,-4,-5, Level3
Manual for Installation V1.0
CHUNDE TECHNOLOGY
CH-CO2
High Concentration CO2transmitter
CH-CO2
General
The CH-CO2 (sensor for wall mounting) and CH-CO2-IP45 (for industrial wall mount) are
designed to measure carbon dioxide (CO2) concentration up to 30 vol.%.
The unit is designed for connecting to controllers, Direct Digital Control (DDC) or other system
with 0-10V or 4-20mA signal inputs. The two parallel signal outputs Vo (0-10V) and Io (4-20mA)
give linear signals corresponding to the measuring range of 0 – 20 vol.% carbon dioxide (0-30%
option on request). An additional fresh-air calibration (Cal) command input is added to facilitate the
calibration in the field.

To open the wall mounted housing
Figure 1. . Closed housing seen from above.
The housing is opened by pressing a screw
driver into the lock opening slot. .
Figure 2. .By pressing a flat screw-driver
into the opening slot, the two locking hook
would be released.
Figure 2. .Hold the top cover and slowly
separate the top and base housing.
Sensor Connections
The sensor connecting terminal is shown in
the figure on the right. Please refer to Table 1
for terminal definition.
Electrical connections
The power supply has to be connected to G+
and G0. G0 is considered as system ground.
The same ground reference has to be used for
the
CH-CO2 unit and for the DDC/signal
receiver.
PLEASE NOTE!
The same ground reference
has to be used for the
CH-
CO2
unit and for the control
system!
Output Configurations
The sensors/controllers are supplied from the factory with 0...10VDC and 4…20mA linear outputs
for Vo and Io (see Table I).
Fresh-Air Calibration (Cal)
The CH-CO2 has built-in fresh-air calibration (Cal) features. To initiate a Cal function, simply
place the powered-up sensor in the room near an opened window, wait for the sensor to stabilize,
and then short the Cal to M for approximately 5 seconds. The sensor reading is then re-calibrated to
0.04 vol.% CO2; a reading closed to the fresh-air concentration.
PLEASE NOTE!
Avoid doing Fresh-air calibration when;
1. Unit is just powered up (sensor should be powered for at least several minutes)
2. In place where the room is crowded with people
3. Where there is source of CO2 generation, such as gas-burner,
4. When the sensor reading is unstable
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