Overview
The Belimo 22DTM-56 is an active duct sensor featuring BACnet MS/TP communication for comprehensive monitoring of CO₂, relative humidity, and temperature. Designed for seamless BMS integration, it delivers reliable digital communication and active voltage output signals.
Features
- Native BACnet MS/TP communication protocol for smart BMS integration
- Combined CO₂, relative humidity, and temperature active sensing
- Field-selectable 0…5 V or 0…10 V analog outputs
- High-precision dual-channel NDIR CO₂ measurement technology
- Robust NEMA 4X / IP65 enclosure for duct installations
Specifications
- Communication Protocol: BACnet MS/TP
- Output Signal: 0…5 V, 0…10 V
- Probe Length: 7 inches [180 mm]
- Probe Diameter: 0.78 inches [19.5 mm]
- Supply Voltage: 24 V AC/DC
- Enclosure Rating: NEMA 4X / IP65
Applications
- Advanced demand-controlled ventilation (DCV) via BACnet networks
- Multi-variable indoor air quality monitoring in HVAC ducts
- Building automation control and environmental monitoring



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