Belimo 22DTC-51 Duct Quality Sensor

Product Description

The BELIMO 22DTC-51 is an active sensor for measuring CO2 with an integrated temperature sensor, featuring dual-channel CO2 technology. Designed for duct mounting with a NEMA 4X rated enclosure, it includes a CO2 gas sensor and a conduit adapter. Field selectable with an output voltage signal range of 0 to 5V and 0 to 10V.

• Active Sensor For Measuring CO? Or With Integrated Temperature Sensor.
• Dual Channel CO? Technology.
• CO2 Gas, Conduit Adaptor, Field Selectable

Product Highlights

The BELIMO 22DTC-51 is ideal for combined duct CO2 and temperature monitoring, especially in demand-controlled ventilation systems.

Product Information

Standard Information

• Brand: BELIMO
• Manufacturer Part Number: 22DTC-51

Technical Specifications

• Mounting: Single-hole duct penetration; A-22D-A34 plastic mounting flange (up to 248°F / 120°C) included
• Enclosure: NEMA 4X / IP65 (UL Enclosure Type 4X), UL 2043 plenum compliant
• Probe Lead: 5-7
• Configuration: Duct
• Sensors Application: Gas Specialty, Temperature
• Output Voltage Signal Range: 0 To 5 V, 0 To 10 V
• Application: Greenhouse,Laboratory,Food & Beverage,IAQ,Parking Garage,Agricultural
• Degree of Protection: IP65 NEMA4X
• Electrical Connection: Pluggable spring-loaded terminal block, max 2.5 mm²
• Measured Values: CO2, Temperature
• Measuring Range Temperature: 40...140B0F [4...60B0C]
• Measuring Range Velocity: Min. 1 ft/s [0.3 m/s] Max. 40 ft/s [12 m/s]
• Mounting Type: Single Point
• Output Signal: Voltage
• Probe Length: 7" [180 mm]
• Product Type: Sensor
• Sensor Type: Air quality
• Voltage AC/DC: AC/DC24V
• Gas Type: CO2
• Sensor Style: Active duct insertion sensor — CO2 + Temperature
• Output Signals: 2× 0-5V or 0-10V (jumper-selectable per channel, min 10 kΩ load)
• CO2 Sensing Technology: NDIR (non-dispersive infrared), dual-channel with self-calibration
• CO2 Measuring Range: 0-2000 ppm default; 0-5000 ppm with A-22G-A05 accessory
• CO2 Accuracy: ±(50 ppm + 3% of measured value)
• CO2 Long-Term Stability: ±50 ppm per year
• CO2 Time Constant τ (63%): Typical 33 s @ 1 m/s air velocity
• Temperature Sensing Element: Active Pt 1000 platinum RTD
• Temperature Measuring Range: 40–140°F (4–60°C)
• Temperature Accuracy: ±0.5°F (±0.3°C) at 77°F
• Temperature Time Constant τ (63%): Typical 125 s @ 3 m/s
• Hardware Revision: A-22D-A34 with 1/2" NPT conduit adapter (2024 revision)
• NFC Configuration: Yes — Belimo Duct Sensor Assistant App (iOS / Android)
• Operating Air Flow: min. 1 ft/s (0.3 m/s); max. 40 ft/s (12 m/s)
• Conduit: 1/2" NPT conduit adapter included + ø6-8 mm cable gland with strain relief
• Power Supply: 24 VAC/VDC (19–29 VAC, 15–35 VDC)
• Power Consumption: 4.3 VA AC / 2.3 W DC
• Cable Entry: Cable gland with strain relief, ø6...8 mm
• Housing: UV-resistant polycarbonate, orange — UL94 5VA
• Probe Material: PA6, black
• Protection Class: IEC/EN III, SELV; UL Class 2 supply
• Certification: IEC/EN 60730-1, CE Marking
• Manufacturer: Belimo
• Manufacturer Part Number: 22DTC-51
• Warranty: 5 years
• Display: No
• Measurement Range: CO2: 0 to 2000 ppm
• Supply Voltage: 24 VAC, ±10%, 2.9 VA (15...24 VDC, ±10%, 1.5 W)
• Humidity: 85% RH non-condensing
• Temperature: ±1% of measuring range @ 70°F [21°C]
• Accuracy: CO2: ±75 ppm; >750 ppm: ±10% of measuring value
• Operating Temperature: 32°F to 120°F [0°C to 50°C]
• Signal Output: DC 0-5V, DC 0-10V, 4-20 mA
• Sensing Technology: NDIR (non-dispersive infrared) with stainless steel wire mesh filter, dual channel calibration
• Weight: 0.26 lbs
• Approvals: IEC/EN, ISO 9001, UL 2043, UL 50
• Item Number: 22DTC-51
• Brand: Belimo
• Sensor Configuration: Duct
• Sensor: CO2 Carbon Dioxide