Model Options

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Weight 5.6 oz (158.8 g)

Power 16 to 35 VDC / 19 to 28 VAC

Humidity Limits: 10 to 95% RH (non-condensing)

Response Time 2 minutes for 99% step change

Accuracy ±40 PPM + 3% of reading (CO2)
±2% (RH)

Output Current: 4 to 20 mA (max 500 Ω)
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)

POWER CONSUMPTION Average: 2 watts
Peak: 3.75 watts

Range

Maximum operating temperature 32 to 122°F (0 to 50°C)

PRESSURE Dependence: 0.13% of reading per mm of Hg

Non Linearity 16 PPM

Temperature Dependence: ±8 ppm/ °C at 1100 PPM

Manufacturer Dwyer Instruments

Sensor Type Single-beam, dual-wavelength NDIR

Type Carbon Dioxide, Relative Humidity and Temperature Transmitters

Approvals

Enclosure Rating Duct mount: NEMA 4X (IP66) for housing only
Wall mount: IP20

Dwyer Instruments 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

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Part Number : CDTR-2D404

The number of sensors installed on a wall or in a duct is decreased with the Carbon Dioxide, Relative Humidity, and Temperature Transmitters, Series CDTR, Model CDTR-2D404. System integrators can cut installation time and material costs by integrating temperature, RH, and CO2 into a single device. A single beam dual wavelength non-dispersive infrared (NDIR) sensor is employed, similar to our well-liked Series CDT Carbon Dioxide Transmitter, to automatically correct the measurement against light source aging effects in both occupied* and unoccupied buildings. The Series CDTR also has the capability to field calibrate the sensor and adjust digitally for barometric pressure, ensuring optimal accuracy. Users can choose the transmitter output to be 4 to 20 mA, 0 to 5 VDC, or 0 to 10 VDC to work with almost any building management controller thanks to universal outputs for both carbon dioxide and relative humidity. For a temperature output, an RTD sensor or passive thermistor can also be supplied. The Series CDTR wall mount versions can be supplied with an integrated LCD display for applications that need visual indication. Temperature only, relative humidity only, CO2 only, CO2 and humidity, or CO2 and temperature are the possible configurations for the display. All transmitter variants come with push buttons that allow users to access the menu structure. An internal jumper option can be used to lock out button operation to avoid tampering.

Specification
Features
Catalog

Specifications

Details

Manufacturer

Dwyer Instruments

Type

Carbon Dioxide, Relative Humidity and Temperature Transmitters

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

Maximum operating temperature

32 to 122°F (0 to 50°C)

Range

Duct Air Velocity: 0-4000 FPM (20.32 m/s)

Humidity

Limits: 10 to 95% RH (non-condensing)

Power

16 to 35 VDC / 19 to 28 VAC

POWER CONSUMPTION

Average: 2 watts
Peak: 3.75 watts

Sensor Type

Single-beam, dual-wavelength NDIR

Output

Current: 4 to 20 mA (max 500 Ω)
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)

Enclosure Rating

Duct mount: NEMA 4X (IP66) for housing only
Wall mount: IP20

Approvals