Series CDT Carbon Dioxide/Temperature Transmitter

NDIR CO2 Sensor, Universal Outputs, Optional Relay

The Series CDT Carbon Dioxide and Temperature Transmitters accurately monitor the CO2 concentration and temperature in indoor environments to help achieve energy savings. In order to achieve a higher level of accuracy, the Series CDT includes barometric pressure adjustment. The CO2 universal output allows users to select the transmitter output to be 4-20 mA, 0-5 VDC, or 0-10 VDC to work with virtually any building management controller.
For applications that require visual indication, the wall mount configurations of the Series CDT can be ordered with an integral LCD display. To prevent tampering, the action of the buttons can be locked out using an internal dip switch selection. The Series CDT CO2 transmitters are available with a -S option that provides the necessary attributes and parameters to be complaint with DSA requirements for monitoring CO2 levels in schools. There is a front facing LED that illuminates when the CO2 level exceeds 1100 PPM.

For models with resistive thermistors or RTD outputs, please see Resistance vs. Temperature Table.

Product Applications

Demand control ventilation in schools, office buildings, hospitals, and other indoor environments
LEED® certification

Starting at $210.10

Ordering

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Duct Mount

North American Housing

North American Housing with LCD

Grouped product items
Model	Description	Availability*	Price
CDT-2D40	Carbon Dioxide Transmitter, duct mount, 2000 ppm CO2 range, 4 to 20 mA / 0 to (5 or 10) VDC CO2 output.	1-3 days*	$210.10
CDT-2D44	Carbon Dioxide Transmitter, duct mount, 2000 ppm CO2 range, 4 to 20 mA / 0 to (5 or 10) VDC CO2 output & temperature output.	1-3 days*	$223.90
CDT-2D4A	Carbon Dioxide Transmitter, duct mount, 2000 ppm, CO2 transmitter with current/voltage CO2 outputs and 10K Ohm Type III thermistor temperature output.	Less Than 1 Week*	$217.15
CDT-2D4B	Carbon Dioxide Transmitter, duct mount, 2000 ppm, CO2 transmitter with current/voltage CO2 outputs and 10K Ohm Type II thermistor temperature output.	1-3 days*	$217.15
CDT-2N40	Carbon Dioxide, Wall Mount, universal current/voltage output, North American Housing.	Less Than 1 Week*	$220.50
CDT-2N44	Carbon Dioxide/Temperature, Wall Mount, universal current/voltage output, North American Housing.	Less Than 1 Week*	$234.30
CDT-2N44-LCD	Carbon Dioxide/Temperature, Wall Mount, universal current/voltage output, North American Housing, LCD Display.	Less Than 1 Week*	$281.10
CDT-2N4B	Carbon Dioxide/Temperature, Wall Mount, universal current/voltage output, 10K Type II Thermistor Temperature Output, North American Housing.	Less Than 1 Week*	$227.55
CDT-2N4B-LCD	Carbon Dioxide/Temperature, Wall Mount, universal current/voltage output, 10K Type II Thermistor Temperature Output, North American Housing, LCD Display.	Less Than 1 Week*	$274.35
CDT-2N4D-LCD	Carbon Dioxide/Temperature, Wall Mount, universal current/voltage output, Pt100 RTD Temperature Output, North American Housing, LCD Display.	Less Than 1 Week*	$275.50

Specifications

Service:: NDIR, 15 year life expectancy.
Range:: CO2: 0 to 2000 or 0 to 5000 PPM (depending on model); Temperature: 32 to 122°F (0 to 50°C).
Accuracy*:: CO2: ±40 PPM + 3% of reading (2000 PPM CO2); ± 50 PPM + 5% of reading (5000 PPM CO2); RH: ±2% (10 to 90% RH) (for units configured with humidity output); Temperature: ±1°C @ 25°C.
Response Time:: 2 min for 90% step change.
Temperature Limits:: 32 to 122°F (0 to 50°C).
Humidity Limits:: 0 to 85% (non-condensing).
Power Requirements:: 16-35 VDC or 19-28 VAC.
Power Consumption:: Average: 2 w; Peak: 3.75 w.
Output:: Current: 4-20 mA (max. 500 Ω); Voltage: 0-5 VDC or 0-10 VDC (min. 500 Ω); Relay: SPST NO rated 2A @ 30 VDC; RTD or thermistor per Resistance vs. Temperature Table (depending on model).
Compliance:: CE.

*The specified CO2 accuracy is only guaranteed after three weeks of continuous operation in environments which are intermittently occupied.

Features

Minimize inventory and save time by combining CO 2 and temperature measurements into one transmitter
Requires minimal maintenance with Automatic Baseline Correction (ABC) to account for sensor drif
Reduce operation costs using a low energy, reliable, and repeatable CO 2 sensor
Simplify installation with backplate electrical connection

Support Library

Product Literature

Manuals

Catalog Pages

Series CDT Catalog Page

Product Data Sheet

SlideShare

Approvals

Drawings

Videos

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 E N				Wall Mount (Disc. Q4/2020) Duct Mount European Wall Mount North American Wall 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 (not available with Mtg Option E, N) PT100 OHM RTD PT1000 OHM RTD 20K OHM NTC Thermistor
OPTIONS						CE COC FC LCD NBC RLY S	CE Approval (Wall Mount only) Certificate of Calibration Factory Calibration Certificate LCD Display No Buttons (Wall Mount only) Relay Output School PPM Indicator

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Accessories

Model	Description	Availability*	Price
A-449	Remote display with mini USB display	1-3 days*	$68.60
GCK-200CO-2000CO2	Gas Calibration Kit (GROUND SHIPMENTS ONLY)	1-3 days*	$726.55