Overview
The Belimo 22DTM-15 is an active multi-variable duct air quality sensor measuring CO₂, humidity, and temperature, equipped with Modbus RTU communication and dual analog voltage outputs.
Features
- Modbus RTU RS485 communication protocol for digital networking
- Active 0…5 V and 0…10 V analog outputs
- Dual-channel NDIR self-calibrating CO₂ sensing technology
- NEMA 4X / IP65 rated enclosure
Specifications
- Communication: Modbus RTU
- Measured Values: CO₂, Humidity, Temperature
- Probe Length: 7 inches [180 mm]
- Output Signal Active: Modbus RTU, 0…5 V, 0…10 V
- Enclosure Rating: NEMA 4X / IP65
Applications
- Networked indoor air quality control in commercial HVAC systems
- Integrated CO₂, temperature, and humidity tracking via Modbus



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