Dwyer Instruments SERIES CDT Data Sheet
SERIES CDT | CARBON DIOXIDE/TEMPERATURE TRANSMITTERS
®
European style
wall mount
North American style
wall mount
Duct mount
FEATURES/BENEFITS
• Single beam dual wavelength NDIR sensor eliminates drift due to light source aging offering long time stability, especially
when used in areas that can be occupied 24 hours a day
• Integral passive temperature outputs reduce number of devices mounted in the space
• Integral display and relay output options to meet building requirements
• Service display tool available for models without an integral LCD - helps save time during set-up and commissioning
DESCRIPTIONAPPLICATIONS
• Demand control ventilation in schools, ofce buildings, hospitals, and
other indoor environments
• LEED® certication
The Series CDT Carbon Dioxide and Temperature Transmitters
accurately monitor the CO2 concentration and temperature in indoor
environments to help achieve energy savings. For increased sensor
accuracy, a single beam dual wavelength non-dispersive infrared
(NDIR) sensor is used to automatically correct the measurement in both
occupied and unoccupied buildings against light source aging effects.
The single beam 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 eld-calibrate the sensor.
For applications that require visual indication, the wall mount congurations
of the Series CDT can be ordered with an integral LCD display. Push
buttons are standard on all congurations of the transmitters for access
to the menu structure, but wall mount congurations can be ordered
without the buttons. To prevent tampering, the action of the buttons can
be locked out using an internal dip switch selection.
SPECIFICATIONS
Sensor Single beam, dual wavelength NDIR.
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; Temperature: ±1°C @ 25°C.
Temperature
Dependence
Non-Linearity 16 PPM.
Pressure Dependence 0.13% of reading per mm of Hg.
Response Time 2 min for 99% step change.
Duct Air Velocity Range 0-4000 FPM (20.32 m/s).
Temperature Limits 32 to 122°F (0 to 50°C).
Humidity Limits 10 to 95% RH (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 2 A @ 30 VDC.
Weight 4.4 oz (125 g).
Enclosure Rating Duct mount: NEMA 4X (IP66) for housing only; Wall mount: IP20.
Agency Approvals CE.
±8 PPM/°C at 1100 PPM.
DIMENSIONS
1.10
3x .15
[3.87]
[1
[90.42]
[3.17]
[84.14]
11-49/64˝
2x .176
[4.47]
.573
[14.56]
.33
[8.38]
3x .37
[9.36]
.552
[14.02]
1.18
[30]
3.000
[76.20]
1.16
[29.39]
4.50
14.30]
3.65
[92.72]
[27.96]
2.80
[71.12]
North American style wall mount
1.08
[27.33]
3.56
European style wall mount
HOW TO ORDER
Use the bold characters from the chart below to construct a product code.
CDT -2 N 4
1/8˝
Ø3-5/16˝
4-25/32˝
[121.44]
4-9/32˝
[108.74]
4 -LCD
2-13/16˝
[71.44]
Duct mount
Ø1-15/64˝
[31.35]
[298.85]
SERIES
CDT: Carbon dioxide/temperature transmitter
RANGE
-2: 0 to 2000 PPM CO
2 range
-5: 0 to 5000 PPM CO2 range
CONFIGURATION
N: North American style wall mount
E: European style wall mount
D: Duct mount
CO
2
4: 4-20 mA / 0 to (5 or 10) VDC
ACCESSORIES
Model Description
GCK-200CO-2000CO2
A-449
A-449A
A-CDT-KIT
Calibration gas kit includes a 99.99% nitrogen gas cylinder for calibrating the zero point and a 200 PPM CO / 2000 PPM CO
gas cylinder for calibrating the span point on Dwyer’s gas sensing transmitters
Remote LCD display allows remote indication of select Dwyer® wall mount transmitters for validation or certication purposes
Remote LCD display with buttons allows remote indication and calibration of select Dwyer® wall mount and duct mount
transmitters for validation and certication purposes
Accessory kit including terminal block and power supply
OPTIONS
-FC: Factory calibration certicate
-LCD: LCD display (wall only)
-RLY: Relay
-NBC: No buttons (wall only)
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
C: 3 KΩ NTC thermistor
D: Pt100 Ω RTD
E: Pt1000 Ω RTD
F: 20 KΩ NTC thermistor
2
ORDER ONLINE TODAY!
Product/SeriesCDT
DWYER INSTRUMENTS, INC.
©Copyright 2020 Dwyer Instruments, Inc.
Printed in U.S.A. 3/20 DS-CDT Rev. 6
Important Notice: Dwyer Instruments, Inc. reserves the right to make changes to or discontinue any product or service identied 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.
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