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Dwyer Instruments
Dwyer CDTR Carbon Dioxide / RH / Temperature Transmitter
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Dwyer CDTR: CO2 + RH ±2% + T; 0–2000/5000 ppm; universal outputs. RFQ.
Download datasheet PDF
RFQ cart holds BOM lines only. Submit for engineering quote.
Key parameters
Measuring range
CO2 0–2000 or 0–5000 ppm; RH 0–100%; Temperature 32 to 122 °F (0 to 50 °C)
Accuracy
CO2 ±40 ppm + 3% of reading; RH ±2%
Output
Universal CO2 and RH outputs 4–20 mA / 0–5 / 0–10 VDC; optional passive thermistor or RTD temperature
Supply
16–35 VDC or 19–28 VAC
Protection
Duct NEMA 4X (IP66) housing; wall IP20
Ambient temperature
32 to 122 °F (0 to 50 °C); humidity limits 10–95% RH non-condensing
Fits combined IAQ sensing where you need a Dwyer CDTR—NDIR CO2 plus RH and temperature transmitter with 0–2000 or 0–5000 ppm CO2, RH 0–100% (±2%), barometric compensation, and universal analogue outputs for CO2 and RH.
Key advantages
- Measurands — CO2, RH, temperature
- CO2 — 0–2000 or 0–5000 ppm
- RH accuracy — ±2%
- Outputs — Universal 4–20 mA / 0–5 / 0–10 VDC
- Mount — Duct NEMA 4X or wall IP20
Typical applications
- IAQ panels.
- HVAC comfort control.
- School / office monitoring.
Selection guide
- CO2 range
- LCD combo display
- Passive T sensor option
Common mistakes
- Condensing RH.
- Wrong jumper outputs.
- Stagnant mounting.
When to RFQ / what to tell us
- Range/mount/options.
- Quantity, ship-to.
Request a Quote · Get selection help
Specs
| Spec | Value |
|---|---|
| SKU | 45412 |
| Brand | Dwyer Instruments |
| Model | CDTR |
| Product type | CO2 RH Temperature Transmitter |
| Measuring range | CO2 0–2000 or 0–5000 ppm; RH 0–100%; Temperature 32 to 122 °F (0 to 50 °C) |
| Accuracy | CO2 ±40 ppm + 3% of reading; RH ±2% |
| Output signal | Universal CO2 and RH outputs 4–20 mA / 0–5 / 0–10 VDC; optional passive thermistor or RTD temperature |
| Supply voltage | 16–35 VDC or 19–28 VAC |
| IP rating | Duct NEMA 4X (IP66) housing; wall IP20 |
| Ambient temperature | 32 to 122 °F (0 to 50 °C); humidity limits 10–95% RH non-condensing |
| Sensor type | NDIR CO2 + RH + temperature (barometric pressure compensation) |
| Display | Optional LCD; configurable CO2 / RH / temperature combinations |
Documents
FAQ
Q: RH accuracy? A: ±2%.
Q: CO2? A: 0–2000 or 0–5000 ppm.
Q: What should I send for a quote? A: Range/mount/options, quantity, ship-to.
Links
- Request a Quote
- Get selection help
- Category-Detectors/)
| Parameter | Value |
|---|---|
| Measuring range | CO2 0–2000 or 0–5000 ppm; RH 0–100%; Temperature 32 to 122 °F (0 to 50 °C) |
| Accuracy | CO2 ±40 ppm + 3% of reading; RH ±2% |
| Output | Universal CO2 and RH outputs 4–20 mA / 0–5 / 0–10 VDC; optional passive thermistor or RTD temperature |
| Supply | 16–35 VDC or 19–28 VAC |
| Protection | Duct NEMA 4X (IP66) housing; wall IP20 |
| Ambient temperature | 32 to 122 °F (0 to 50 °C); humidity limits 10–95% RH non-condensing |
| Display | Optional LCD; configurable CO2 / RH / temperature combinations |
| Approvals | CE |
| Mounting | Wall (North American / European housings) or duct |
| Sensor type | NDIR CO2 + RH + temperature (barometric pressure compensation) |
| Notes | Series CDTR combines CO2, RH, and temperature in one transmitter. Specs from Dwyer CDTR datasheet. |
| Duct Air Velocity | 0–4000 FPM (20.32 m/s) |