Overview
The Belimo 22DTM-51 is an active air quality duct sensor designed for precise multi-parameter measurement of CO₂, relative humidity, and temperature in commercial HVAC environments.
Features
- Simultaneous active monitoring of CO₂, humidity, and temperature
- Self-calibrating dual-channel NDIR CO₂ sensing technology
- Selectable 0…5 V / 0…10 V analog output signals
- NEMA 4X / IP65 rated protective housing for duct mounting
Specifications
- Measured Values: CO₂, Humidity, Temperature
- Probe Length: 7 inches [180 mm]
- Probe Diameter: 0.77 inches [19.5 mm]
- Output Signal Active: 0…5 V, 0…10 V
- Enclosure Rating: NEMA 4X / IP65
Applications
- Advanced demand-controlled ventilation (DCV) strategies
- Comprehensive supply and return duct air quality tracking



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