Duct carbon dioxide (CO2) transmitter without display, CDK 24
Duct carbon dioxide (CO2) transmitter with display, CDK 24D
The first line shows the CO2 measured value in ppm.
In the second line, the switching status of the relay is shown on the left as a circuit (full ● = relay energized; empty ○ = relay de-energized) followed by the indicator
(C for CO2 ) and the switch point value is shown on the right.
Automatic calibration of the carbon dioxide measurement – ABC logic (default)
Manual calibration can be carried out regardless of the position of the DIP switch (ABC logic).
The duct carbon dioxide (CO2) transmitter CDK 24-seris provides reliable solutions for energy management through Demand Control of Ventilation (DCV) systems in buildings.
The duct carbon dioxide (CO2) transmitter CDK 24-series is a maintenance-free,
micro- processor-controlled unit designed for duct installation and is used to detect the CO2 content of the air.
The CO2 measuring range for carbon dioxide (CO2) transmitter CDK 24-series is
0-2000 ppm or 0-5000 ppm (jumper selectable) converted to standard signals 0 -10 Vdc or 4-20 mA (jumper selectable).
CDK 24-series duct carbon dioxide (CO2) transmitter supplied including duct mounting flangefor good sealing into the duct and have IP65 enclosure with quick locking screws.
CDK 24 is with out display and CDK 24D is with display.
The CO2 content of the air is measured using an optical NDIR sensor (non-dispersive infra-red technology).
The duct carbon dioxide (CO2) transmitter CDK 24 have automatic calibration of the carbon dioxide measurement – ABC logic (default).
The detection range of the duct CO2 sensor is calibrated for standard applications such as monitoring residential rooms and conference rooms.
Room ventilation on and as-needed basis, improved well-being and customer benefit, increased comfort as well as reduced operating costs through energy conservation are just some of the benefits of employing duct CO2 sensors.
24 Vac/dc (+/-10%)
< 1.5W / 24 Vdc typical
< 2.9 VA / 24 Vac typical
Peak current 200 mA
optical NDIR sensor(non-dispersive infra-red technology)
with automatic calibration
0-2000 ppm or 0-5000 ppm, jumper selectable
0-10 Vdc or 4-20 mA, jumper selectable
± 30 ppm ± 3% of measured at 25°C
± 5 ppm ⁄ °C
± 5% of measured value / °C
(which ever is higher)
±0.13% / mm Hg
< 2 % in 15 years
Warm up time:
approx. 1 hour
-10 to +60 °C
approx. 1 minute
0.14 - 1.5 mm2, via screw terminals
plastic, material polyamide,
30 % glass-globe-reinforced,
with quick-locking screws
(slotted ⁄ Phillips head combination),
colour traffic white (similar to RAL 9016)
72 x 64 x 37.8 mm
M 16 x 1.5; including strain relief, exchangeable
Protective tube material:
polyamide (PA6), Ø 20 mm,
NL = 202.5 mm, with torsion protection
via flange made of plastic
(included in scope of delivery)
III (according to EN 60 730)
IP 65 (according to EN 60 529) enclosure only!
electromagnetic compatibility according to
EN 61 326, EMC Directive 2004 ⁄ 108 ⁄ EC
2 different types
Download CE declaration of conformity
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