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Series-RHP-EN1
Series-RHP-EN2CDTCDT1CDT2

Dwyer Series CDTR Carbon Dioxide/RH/Temperature Transmitter

Range

Configuration

CO2 Output

Temperature Output

RH Output

Options

Accessories

Product Description

NDIR CO2 Sensor, Universal CO2/RH Outputs, Optional Relay

Series CDTR Carbon Dioxide, Relative Humidity and Temperature Transmitters reduce the number of sensors mounted on a wall or in a duct. By combining CO2, RH, and temperature in one device, system integrators are able to lower installation time of mounting multiple housings, while lowering material cost at the same time. Even with the three sensors combined into a single unit, replacement cost is not increased due to the pluggable nature of the humidity sensor, which allows it or the temperature to be replaced at a fraction of the cost of a new CO2 transmitter.

Like our popular Series CDT Carbon Dioxide Transmitter, a single-beam dualwavelength 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 a higher 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 the best possible accuracy, the Series CDTR also includes digital barometric pressure adjustment and the ability to field-calibrate the sensor.

Universal outputs for both carbon dioxide and relative humidity 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. Additionally, passive thermistor or RTD sensor can be ordered for a temperature output. An optional relay for the carbon dioxide measurement 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 CDTR 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 or A-449A remote LCD display can plug into the miniature connector port on the transmitter. The display can be configured to display temperature only, relative humidity only, CO2 only, CO2 and humidity, or CO2 and temperature. 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.

*For buildings occupied 24 hours per day, it is recommended that calibration be verified every 6 to 12 months depending on application.

Product Applications

  • On Demand Ventilation

Models

Model Description
CDTR-2D404 Carbon Dioxide/RH/Temperature Transmitter, 2000 ppm CO2 range, duct mount, 4 to 20 mA/0 to (5 or 10) VDC CO2 output, RH outputs & no temperature output.
CDTR-2D4A4 Carbon Dioxide/RH/Temperature Transmitter, 2000 ppm CO2 range, duct mount, 4 to 20 mA/0 to (5 or 10) VDC CO2 output, RH outputs &
10K Ω Type 3 thermistor temperature output.
CDTR-2D4B4 Carbon Dioxide/RH/Temperature Transmitter, 2000 ppm CO2 range, duct mount, 4 to 20 mA/0 to (5 or 10) VDC CO2 output, RH outputs & 10K Ω Type 2 thermistor temperature output.
CDTR-2D4D4 Carbon Dioxide/RH/Temperature Transmitter, 2000 ppm CO2 range, duct mount, 4 to 20 mA/0 to (5 or 10) VDC CO2 output, RH outputs & Pt100 Ω RTD temperature output.
CDTR-2D4E4 Carbon Dioxide/RH/Temperature Transmitter, 2000 ppm CO2 range, duct mount, 4 to 20 mA/0 to (5 or 10) VDC CO2 output, RH outputs & Pt1000 Ω RTD temperature output.
CDTR-2D4F4 Carbon Dioxide/RH/Temperature Transmitter, 2000 ppm CO2 range, duct mount, 4 to 20 mA/0 to (5 or 10) VDC CO2 output, RH outputs & 20K Ω thermistor temperature output.
CDTR-2E404 Carbon Dioxide/Humidity, Wall Mount, universal current/voltage output, European Housing.
CDTR-2E404-LCD Carbon Dioxide/Humidity, Wall Mount, universal current/voltage output, European Housing, LCD Display.
CDTR-2E4A4 Carbon Dioxide/Temperature/Humidity, Wall Mount, universal current/voltage output, 10K Type III Thermistor Temperature Output, European Housing.
CDTR-2E4A4-LCD Carbon Dioxide/Temperature/Humidity, Wall Mount, universal current/voltage output, 10K Type III Thermistor Temperature Output, European Housing, LCD Display.
CDTR-2E4B4 Carbon Dioxide/Temperature/Humidity, Wall Mount, universal current/voltage output, 10K Type II Thermistor Temperature Output, European Housing.
CDTR-2E4B4-LCD Carbon Dioxide/Temperature/Humidity, Wall Mount, universal current/voltage output, 10K Type II Thermistor Temperature Output, European Housing, LCD Display.
CDTR-2E4C4 Carbon Dioxide/Temperature/Humidity, Wall Mount, universal current/voltage output, 3K Thermistor Temperature Output, European Housing.
CDTR-2E4C4-LCD Carbon Dioxide/Temperature/Humidity, Wall Mount, universal current/voltage output, 3K Thermistor Temperature Output, European Housing, LCD Display.
CDTR-2E4D4 Carbon Dioxide/Temperature/Humidity, Wall Mount, universal current/voltage output, Pt100 RTD Temperature Output, European Housing.
CDTR-2E4D4-LCD Carbon Dioxide/Temperature/Humidity, Wall Mount, universal current/voltage output, Pt100 RTD Temperature Output, European Housing, LCD Display.
CDTR-2E4E4 Carbon Dioxide/Temperature/Humidity, Wall Mount, universal current/voltage output, Pt1000 RTD Temperature Output, European Housing.
CDTR-2E4E4-LCD Carbon Dioxide/Temperature/Humidity, Wall Mount, universal current/voltage output, Pt1000 RTD Temperature Output, European Housing, LCD Display.
CDTR-2E4F4 Carbon Dioxide/Temperature/Humidity, Wall Mount, universal current/voltage output, 20K Thermistor Temperature Output, European Housing.
CDTR-2E4F4-LCD Carbon Dioxide/Temperature/Humidity, Wall Mount, universal current/voltage output, 20K Thermistor Temperature Output, European Housing, LCD Display.
CDTR-2N404 Carbon Dioxide/Humidity, Wall Mount, universal current/voltage output, North American Housing.
CDTR-2N404-LCD Carbon Dioxide/Humidity, Wall Mount, universal current/voltage output, North American Housing, LCD Display.
CDTR-2N4A4 Carbon Dioxide/Temperature/Humidity, Wall Mount, universal current/voltage output, 10K Type III Thermistor Temperature Output, North American Housing.
CDTR-2N4A4-LCD Carbon Dioxide/Temperature/Humidity, Wall Mount, universal current/voltage output, 10K Type III Thermistor Temperature Output, North American Housing, LCD Display.
CDTR-2N4B4 Carbon Dioxide/Temperature/Humidity, Wall Mount, universal current/voltage output, 10K Type II Thermistor Temperature Output, North American Housing.
CDTR-2N4B4-LCD Carbon Dioxide/Temperature/Humidity, Wall Mount, universal current/voltage output, 10K Type II Thermistor Temperature Output, North American Housing, LCD Display.
CDTR-2N4C4 Carbon Dioxide/Temperature/Humidity, Wall Mount, universal current/voltage output, 3K Thermistor Temperature Output, North American Housing.
CDTR-2N4C4-LCD Carbon Dioxide/Temperature/Humidity, Wall Mount, universal current/voltage output, 3K Thermistor Temperature Output, North American Housing, LCD Display.
CDTR-2N4D4 Carbon Dioxide/Temperature/Humidity, Wall Mount, universal current/voltage output, Pt100 RTD Temperature Output, North American Housing.
CDTR-2N4D4-LCD Carbon Dioxide/Temperature/Humidity, Wall Mount, universal current/voltage output, Pt100 RTD Temperature Output, North American Housing, LCD Display.
CDTR-2N4E4 Carbon Dioxide/Temperature/Humidity, Wall Mount, universal current/voltage output, Pt1000 RTD Temperature Output, North American Housing.
CDTR-2N4E4-LCD Carbon Dioxide/Temperature/Humidity, Wall Mount, universal current/voltage output, Pt1000 RTD Temperature Output, North American Housing, LCD Display.
CDTR-2N4F4 Carbon Dioxide/Temperature/Humidity, Wall Mount, universal current/voltage output, 20K Thermistor Temperature Output, North American Housing.
CDTR-2N4F4-LCD Carbon Dioxide/Temperature/Humidity, Wall Mount, universal current/voltage output, 20K Thermistor Temperature Output, North American Housing, LCD Display.
CDTR-2W404 Carbon Dioxide/RH transmitter, wall mount, 2000 ppm CO2 range, universal current/voltage output for CO2/RH.
CDTR-2W404-LCD Carbon Dioxide/RH transmitter, wall mount with LCD display, 2000 ppm CO2 range, universal current/voltage output for CO2/RH.
CDTR-2W4A4 Carbon Dioxide/RH/Temperature transmitter, wall mount, 2000 ppm CO2 range, universal current/voltage output for CO2/RH, 10K Type III thermistor.
CDTR-2W4A4-LCD Carbon Dioxide/RH/Temperature transmitter, wall mount with LCD display, 2000 ppm CO2 range, universal current/voltage output for CO2/RH, 10K Type III thermistor.
CDTR-2W4B4 Carbon Dioxide/RH/Temperature transmitter, wall mount, 2000 ppm CO2 range, universal current/voltage output for CO2/RH, 10K Type II thermistor.
CDTR-2W4B4-LCD Carbon Dioxide/RH/Temperature transmitter, wall mount with LCD display, 2000 ppm CO2 range, universal current/voltage output for CO2/RH, 10K Type II thermistor.
CDTR-2W4D4 Carbon Dioxide/RH/Temperature transmitter, wall mount, 2000 ppm CO2 range, universal current/voltage output for CO2/RH, PT100 RTD.
CDTR-2W4E4 Carbon Dioxide/RH/Temperature transmitter, wall mount, 2000 ppm CO2 range, universal current/voltage output for CO2/RH, PT1000 RTD.
CDTR-2W4F4 Carbon Dioxide/RH/Temperature transmitter, wall mount, 2000 ppm CO2 range, universal current/voltage output for CO2/RH, 20K thermistor.
CDTR-5D404 Carbon Dioxide/RH/Temperature Transmitter, 5000 ppm CO2 range, duct mount, 4 to 20 mA/0 to (5 or 10) VDC CO2 output, RH outputs & no temperature output.
CDTR-5W404 Carbon Dioxide/RH transmitter, wall mount, 5000 ppm CO2 range, universal current/voltage output for CO2/RH.

Specifications

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 (CO2); ±2% (RH).
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.
Temperature Limits:
32 to 122°F (0 to 50°C).
Humidity Limits:
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 O);
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.

Literature

Manuals

Catalog Pages

Series CDTR Catalog Page

Approvals

Accessories

Model Number Description
Remote display with mini USB display. A-449 Remote display with mini USB display.
Gas Calibration Kit (GROUND SHIPMENTS ONLY) GCK-200CO-2000CO2 Gas Calibration Kit (GROUND SHIPMENTS ONLY)
A-CDT-KIT Wall mount calibration adapter kit for Series CDT/CDTR/CDTA, kit includes terminal block & power supply.

Model Chart

EXAMPLE CDTR 2 W 4 0 4 LCD Series CDTR-2W404-LCD, Carbon Dioxide/RH/Temperature Transmitter, gas concentration range 2000 ppm, wall mount, carbon dioxide output 0-5 VDC/0-10VDC/4-20mA, RH output 0-5 VDC/0-10 VDC/4-20 mA, LCD display
SERIES CDTR             Carbon Dioxide/RH/Temperature Transmitter
GAS CONCENTRATION RANGE   2
5
          2000 ppm
5000 ppm
MOUNTING CONFIGURATION     W
D
E
N
        Wall Mount
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
PT100 OHM RTD               
PT1000 OHM RTD              
20K OHM NTC Thermistor      
RH OUTPUT           4   0-5 VDC/0-10 VDC/4-20 mA
OPTIONS             CE
COC
FC
LCD
NBC
RLY
CE Approval (Wall Mount Only)
Certificate of Calibration
Factory Calibration Certificate
LCD Display
No Buttons
Relay Output