Overview
The Belimo 22DCM-51 is an active duct sensor designed to measure carbon dioxide, volatile organic compounds (VOCs), and temperature in HVAC ductwork. It provides selectable 0-5 V or 0-10 V outputs across a robust platform for accurate ventilation control.
Features
- Measures CO₂, VOC, and temperature in one compact housing
- Dual-channel NDIR CO₂ sensor with automatic self-calibration
- Field-selectable 0…5 V or 0…10 V analog outputs
- IP65 / NEMA 4X rated enclosure for harsh duct environments
- Comes complete with mounting flange for easy installation
Specifications
- Measured Values: CO₂, VOC, Temperature
- Output Signal: 0…5 V, 0…10 V
- Probe Length: 7 inches [180 mm]
- Probe Diameter: 0.77 inches [19.5 mm]
- Supply Voltage: 24 V AC/DC
- Enclosure Rating: NEMA 4X / IP65
Applications
- Multi-variable air quality measurement in duct systems
- Demand-controlled ventilation in commercial buildings
- Environmental parameter tracking for building management networks


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