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

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Models & Ordering

Shipping Information

All shipping times are dependent on product availability at time of shipment.

Although we make every effort to ensure a continuous supply of our products, occasional circumstances may force us to temporarily run out of a product, or have shipping delays. Should this occur, customers will be notified soon after placement of any orders for such products and, if applicable, items will be put on backorder. For orders requiring expedited shipment, our customer service team can be contacted to confirm product availability

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Model	Description	Usually Ships*	Price	Order
CDT-2N40 Ships: Next Day Price: $212.00	Carbon Dioxide/Temperature transmitter, wall mount, universal current/voltage output, 0 to 2000 PPM CO 2 range, North American housing.	Next Day*	$212.00	Order
CDT-2N44 Ships: Next Day Price: $225.25	Carbon Dioxide/Temperature transmitter, wall mount, universal current/voltage output, 0 to 2000 PPM CO 2 range, 4-20 mA / 0 to (5 or 10) VDC, North American housing.	Next Day*	$225.25	Order
CDT-2N4A Ships: Less Than 1 Week Price: $218.80	Carbon Dioxide/Temperature transmitter, wall mount, universal current/voltage output, 10K Type III Thermistor Temperature Output, 0 to 2000 PPM CO 2 range, North American housing.	Less Than 1 Week*	$218.80	Order
CDT-2N4B Ships: Next Day Price: $218.80	Carbon Dioxide/Temperature transmitter, wall mount, universal current/voltage output, 10K Type II Thermistor Temperature Output, 0 to 2000 PPM CO 2 range, North American housing.	Next Day*	$218.80	Order
CDT-2N4B-RLY Ships: Less Than 1 Week Price: $232.05	Carbon Dioxide/Temperature transmitter, wall mount, universal current/voltage output, 10K Type II Thermistor Temperature Output, 0 to 2000 PPM CO 2 range, North American housing with relay.	Less Than 1 Week*	$232.05	Order
CDT-2N4D Ships: Less Than 1 Week Price: $219.90	Carbon Dioxide/Temperature transmitter, wall mount, universal current/voltage output, Pt100 RTD Temperature Output, 0 to 2000 PPM CO 2 range, North American housing.	Less Than 1 Week*	$219.90	Order
CDT-2N4E Ships: Less Than 1 Week Price: $219.90	Carbon Dioxide/Temperature transmitter, wall mount, universal current/voltage output, Pt1000 RTD Temperature Output, 0 to 2000 PPM CO 2 range, North American housing.	Less Than 1 Week*	$219.90	Order
CDT-2N4F Ships: Less Than 1 Week Price: $218.80	Carbon Dioxide/Temperature transmitter, wall mount, universal current/voltage output, 20K Thermistor Temperature Output, 0 to 2000 PPM CO 2 range, North American housing.	Less Than 1 Week*	$218.80	Order

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Specifications

Sensor:: 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); Temperature: ±1°C @ 25°C.
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:: 10 to 85% RH (non-condensing).
Power Requirements:: 16 to 35 VDC or 19 to 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 r-t curves on page 4 (depending on model).
Weight:: 4.4 oz (125 g).
Enclosure Rating:: Duct mount: NEMA 4X (IP66) for housing only; Wall mount: IP20.
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 CO2 and temperature measurements into one transmitter
Reduces the number of devices mounted in the space with integral humidity and temperature sensors
Requires minimal maintenance with Automatic Baseline Correction (ABC) to account for sensor drift
Reduce operation costs using a low energy, reliable, and repeatable CO2 sensor
Simplify installation with backplate electrical connection

Accessories

Model Number	Description	Usually Ships*	Price	Order
A-449	Remote display with mini USB display.	Next Day	$66.50	Order
GCK-200CO-2000CO2	Gas Calibration Kit (GROUND SHIPMENTS ONLY)	Call for Details	$702.00	Order
A-CDT-KIT	Accessory kit including terminal block and power supply.	1-2 Weeks	$52.50	Order
A-449A	Remote display with push buttons and mini USB. (Necessary for models with –NBC option)	Less Than 1 Week	$130.00	Order

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 (Disc. Q4/2020) Certificate of Calibration Factory Calibration Certificate LCD Display No Buttons (Wall Mount only) Relay Output School PPM Indicator

Product Literature

Manuals

Catalog Pages

Series CDT Catalog Page

Product Data Sheet

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