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Series CDT 2012 - Carbon Dioxide/Temperature Transmitter

Carbon Dioxide/Temperature Transmitter

NDIR Sensor, Universal Outputs, Optional Relay

Series CDT Carbon Dioxide and Temperature Transmitters accurately monitor the CO2 concentration and temperature in schools, office buildings, and other indoor environments to help achieve LEED® certification. For increased sensor life, a single-beam dual-wavelength non-dispersive infrared (NDIR) sensor is used to automatically correct the measurement in both occupied and unoccupied buildings against aging effects. The singlebeam dual-wavelength sensor technology provides the highest level of accuracy compared to Automatic Baseline Correction methods which can unintentionally shift the calibration based on CO2 levels and barometric pressure conditions. In order to achieve a higher level of accuracy, the Series CDT includes digital barometric pressure adjustment and the ability to field-calibrate the sensor.

Universal outputs allow users to select the transmitter output to be 4 to 20 mA, 0 to 5 VDC, or 0 to 10 VDC to work with virtually any building management controller. An optional relay with user adjustable set points can be used to control exhaust fans, open actuated windows or dampers, or signal a light or horn.

For applications that require visual indication, the wall mount configurations of the Series CDT can be ordered with an integral LCD display. When ordering a duct mount configuration or a wall mount configuration without the display, the Model A-449 remote LCD display can plug into the miniature connector port on the transmitter. The display can be configured to display temperature only, CO2 only, or CO2 and temperature together. Push buttons are standard on all configurations of the transmitters for access to the menu structure, but wall mount configurations can be ordered without the buttons. To prevent tampering, the action of the buttons can be locked out using an internal jumper selection. Menu items that can be accessed via the push buttons include: engineering units, relay output set points, display configuration, transmitter output scaling, ambient barometric pressure, and field calibration of the transmitter.

Single beam dual-wavelength sensor advantages:

  • Automatically corrects for aging effects in occupied and unoccupied buildings
    • Perfect for hospitals and manufacturing plants that are occupied 24 hours per day
  • Measures actual unfiltered light intensity directly
    • Eliminates error from incorrect assumptions of gas concentration in theoretical logic assumption methods

·         Sensor: Single beam, dual-wavelength NDIR.

·         Range::
CO2: 0 to 2000 or 0 to 5000 ppm (depending on model);
Relative Humidity: 0 to 100%
Temperature: 32 to 122°F (0 to 50°C).

·         Accuracy: ±40 ppm + 3% of reading.

·         Temperature Dependence: ±8 ppm / °C at 1100 ppm.

·         Non-Linearity: 16 ppm.

·         Pressure Dependence: 0.13% of reading per mm of Hg.

·         Response Time: 2 minutes for 99% step change.

·         Ambient Operating Temperature: 32 to 122°F (0 to 50°C).

·         Ambient Operating Humidity: 10 to 95% RH (non-condensing).

·         Power Requirements: 16 to 35 VDC / 19 to 28 VAC.

·         Power Consumption: Average: 2 watts; Peak: 3.75 watts.

·         Sensor: Single beam, dual-wavelength NDIR.

·         Output:
Current: 4 to 20 mA (max 500 Ω);
Voltage: 0 to 5 VDC or 0 to 10 VDC (min 500 Ω);
Relay: SPST NO 2A @ 30 VDC;
RTD or thermistor per r-t curves (depending on model).

·         Weight: 5.6 oz (158.8 g).

·         Agency Approvals: CE (duct mount only).

 

Model Chart

EXAMPLE

CDT

2

W

4

0

LCD

Series CDT-2W40-LCD, Carbon Dioxide Transmitter, gas concentration range 200 ppm, wall mount, carbon dioxide output 0-5 VDC/0-10VDC/4-20mA, LCD display

SERIES

CDT

 

 

 

 

 

Carbon DioxideTransmitter

GAS CONCENTRATION RANGE

 

2
5

 

 

 

 

2000 ppm
5000 ppm

MOUNTING CONFIGURATION

 

 

W
D

 

 

 

Wall Mount
Duct Mount

CARBON DIOXIDE OUTPUT

 

 

 

4

 

 

0-5 VDC/0-10 VDC/4-20mA

TEMPERATURE OUTPUT

 

 

 

 


0
4
A
B
C
D
E
F
 

 

NONE                        
0-5 VDC/0-10 VDC/4-20 mA
10K OHM Type 3 NTC Thermistor
10K OHM Type 2 NTC Thermistor
3K OHM NTC Thermistor
PT100 OHM RTD               
PT1000 OHM RTD              
20K OHM NTC Thermistor      

OPTIONS

 

 

 

 

 

LCD
NBC
RLY

LCD Display
No Buttons (wall only)
Relay Output

 
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Installation, Operation Manual:
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