Omega CDT User guide

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SERIES CDT | CARBON DIOXIDE/TEMPERATURE TRANSMITTERS

North American style

wall mount

DSA* compliant

option -S

Duct mount

FEATURES/BENEFITS

• Minimize inventory and save time by combining CO2 and temperature measurements into one transmitter

• Requires minimal maintenance with Automatic Baseline Correction (ABC) to account for sensor drift

• Reduce operation costs using a low energy, reliable, and repeatable CO

2 sensor

• Simplify installation with backplate electrical connection

DESCRIPTIONAPPLICATIONS

• Demand control ventilation in schools, ofce buildings, hospitals, and

other indoor environments

• LEED® certication

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

congurations 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 compliant with DSA requirements for monitoring CO2 levels in schools. There is a front

facing LED that illuminates when the CO2 level exceeds 1100 PPM.

SPECIFICATIONS

Sensor NDIR, 15 year life expectancy.

Range CO

Accuracy** CO

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

Compliance CE.

**The specied CO

2 accuracy is only guaranteed after three weeks of continuous operation in environments which are intermittently occupied.

2: 0 to 2000 or 0 to 5000 PPM (depending on model); Temperature: 32 to 122°F (0 to 50°C). 2: ±40 PPM + 3% of reading (2000 PPM CO2); ± 50 PPM + 5% of reading (5000 PPM CO2); Temperature: ±1°C @ 25°C.

thermistor per r-t curves on page 4 (depending on model).

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DIMENSIONS

1.10

[76.20]

[71.12]

[3.17]

[84.14]

11-49/64˝

2x .176

[4.47]

.573

[14.56]

.552

[14.02]

3.000

[27.96]

4.50

14.30]

2.80

North American style wall mount

HOW TO ORDER

Use the bold characters from the chart below to construct a product code.

CDT -2 N 4

SERIES

CDT: Carbon dioxide/temperature transmitter

RANGE

-2: 0 to 2000 PPM CO2 range

-5: 0 to 5000 PPM CO2 range

CONFIGURATION

N: North American style wall mount D: Duct mount

CO2

4: 4-20 mA / 0 to (5 or 10) VDC

1/8˝

Ø3-5/16˝

4-25/32˝ [121.44]

4-9/32˝

[108.74]

4 -LCD

[298.85]

2-13/16˝

[71.44]

Ø1-15/64˝

[31.35]

Duct mount

OPTIONS

-FC: Factory calibration certicate

-LCD: LCD display (wall only)

-RLY: Relay

-S: School

TEMPERATURE OUTPUT

0: None 4: 4-20 mA / 0 to (5 or 10) VDC A: 10 KΩ NTC thermistor type III B: 10 KΩ NTC thermistor type II D: Pt100 Ω RTD E: Pt1000 Ω RTD F: 20 KΩ NTC thermistor

ACCESSORIES

Model Description A-449 A-449A

Remote LCD display allows remote indication of select Dwyer Remote LCD display with buttons allows remote indication and calibration of select Dwyer® wall mount and duct mount transmitters for validation and certication purposes

*Per Public Utilities Code 1625 (Assembly Bill 841), carbon dioxide monitors are required in all classrooms as of January 1, 2021. The Division of the State Architect is providing regulatory requirements in CALGreen so that it can enforce the provisions of statute for K-12 public schools and community

colleges. While the provisions of 5.506.3.1 are not enforceable as part of the plan review and construction process, regulatory requirements that address

wall mount transmitters for validation or certication purposes

maintenance issues provide clarity to the facility owner and reinforce the additional requirements specied in statute.

LEED

is a registered trademark of the U.S. Green Building Council.

DWYER INSTRUMENTS, LLC

Important Notice: Dwyer Instruments, LLC reserves the right to make changes to or discontinue any product or service identied in this publication without notice. Dwyer advises its customers to obtain the

latest version of the relevant information to verify, before placing any orders, that the information being relied upon is current.