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General
CD-300(G)and CD-300L(G) Transmitter type
models of CO2 Sensor, which are for 0-20mA ,
4-20mA Current output module or 0-10V, 2-
10V Voltage output module(Jumper select)
These models give 3 wired input power (2
PWR lines, 1 Common GND line).
Features
• Non-Dispersive Infrared(NDIR) technology
• Either of four (2 Set of Analog Voltage or
2 set Current) output can be chosen by
Jumper. (4~20mA/2~10V/0~20mA/0~10V)
• Customer could select multiple functions
-. Factory calibration mode is available.
-. 10 minutes manual recalibration or weekly
Auto-Calibration is settable.
• Simple maintenance (S-300(G) sensor is
detachable from main board, which gives
easier manipulation on sensor module.)
• Size : 123 x 69 x 40 (mm)
Carbon Dioxide (CO₂) Transmitter
(3-wired type) Operation Manual
CD-300(G) / CD-300L(G)
CD-300(G)
CD-300L(G)
(with LCD Display)
Version 2.72
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CD-300(G)/CD-300L(G)
Transmitter Specifications
General Performance
Operating Temperature range
-10℃ ~ 60℃
Operating Humidity range
0 ~ 95% RH (Non-condensing)
‘G’:0~99% RH(Non-condensing)
Storage Temperature
-30℃ ~70℃
CO₂ Measurement
Sensing Method
NDIR (Non-dispersive Infrared)
Measurement Range
0 to 2,000 / 3,000 / 5,000 / 10,000ppm
(Jumper selectable)
(2%/3%/5%/7% are available)
Accuracy
±30ppm ±5%
Response Time(90%)
150 seconds
Sampling Interval
3 sec.
Operation mode selection
Factory calibration mode should be used
(Automatic calibration mode is only Indoor Air
Quality Monitoring).
Two manual recalibration methods are
available with manual recalibration by change
of J2 & J4 or by using TRB-100ST Jig (TRB-
100ST Jig : On Sale)
Electrical Data
Input Power
24VDC ± 20% (3-Wired)
Output Signals
4 ~ 20mA or 2 ~ 10VDC
0 ~ 20mA or 0 ~ 10VDC
, (Jumper selectable
-voltage output or current output)
Dimensions (unit : mm)
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Front Inside View
Rear View
Jumper Function Descriptions
■ Jumper A (J7, J3) group : Voltage,
Current output and range selection.
V : Analog Voltage output
I : Current output
0~20mA : 0~20mA output @ Current.
0~10V output @ Voltage
4~20mA : 4~20mA output @ Current.
2~10V output @ Voltage.
Example setting :
Current output and 0~ 20mA output
Jumper : A
Jumper : B
Jumper : C
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■ Jumper B(J11) group : CO2 Measurement
range selection.
10K ppm : 0 ~ 10,000ppm CO2
5K ppm : 0 ~ 5,000ppm CO2
3K ppm : 0 ~ 3,000ppm CO2
2K ppm : 0 ~ 2,000ppm CO2
■ Jumper B(J11) group for High CO2
Measurement range selection.
70K ppm : 0 ~ 70,000ppm CO2
50K ppm : 0 ~ 50,000ppm CO2
30K ppm : 0 ~ 30,000ppm CO2
20K ppm : 0 ~ 20,000ppm CO2
Example setting :
Weekly Auto-calibration or 10 minutes
Manual-Calibration setting is available
Wiring Method
1. VIN+: 24VDC+,
2. VIN- : Common GND
3. A-OUT: Output signal
(Voltage or Current).
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Output signal calculation examples
Ex) 3,000ppm range 0~10V mode.
Read voltage 3.234V
3,000ppm / 10V * 3.234 = 970 ppm.
Ex) 3,000ppm range 2~10V mode.
Read voltage 3.234V
(3.234V - 2V) * (3000ppm / 8)= 462 ppm.
ELT SENSOR Corp.
Chunui Technopark 101-909) 36, Bucheon-ro 198beon-gil,Wonmi-
gu,Bucheon-si, Gyeonggi-do, 420-857,Korea
Phone. +82-32-719-8055, http://www.eltsensor.co.kr
Subject to change without notice. Printed in KOREA
2014 ELT Sensor Corp. All rights reserved.
2015 June
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