Overview
The Belimo 22DCV-51 is an active duct sensor dedicated to measuring CO₂ and VOC levels in air duct applications. It converts measured air quality values into selectable analog voltage signals for integration into building control systems.
Features
- Active dual-parameter sensing for CO₂ and VOCs
- Self-calibrating NDIR sensor technology for CO₂ measurement
- Selectable 0…5 V or 0…10 V output signals
- NEMA 4X / IP65 rated enclosure withstands tough conditions
- Supplied with mounting flange and strain relief conduit adapter
Specifications
- Measured Values: CO₂, VOC
- 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
- CO₂ and VOC level detection in HVAC ductwork
- Demand-controlled ventilation in commercial and industrial facilities
- Air quality automation and fresh air intake control



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