The Merlin RSVCO21 Carbon Dioxide Detector is a high accuracy CO₂, temperature and humidity room sensor for air quality monitoring in residential, commercial, public and light industrial environments. Made in the UK, this multi-function detector has analog, digital and relay outputs for integration with building management systems (BMS) via Modbus RTU or BACnet MS/TP protocols.
With its non-dispersive infrared (NDIR) CO₂ sensing technology, self-calibrating function and excellent long term stability the RSVCO21 gives consistent performance and accuracy. It’s perfect for indoor environments such as classrooms, offices, laboratories and plant rooms—helping to maintain safe and efficient air quality standards in accordance with IGEM/UP/11, BS 50543 and BS 61010-1.
The Merlin RSVCO21 is more than a CO₂ sensor – it’s a complete indoor air quality monitoring solution. Its high accuracy, triple sensor design and communication options make it perfect for modern BMS integrated buildings where safety, compliance and comfort matter.
Protect people, optimise ventilation and comply with the Merlin RSVCO21 Carbon Dioxide Detector – Up to 4500ppm. Buy now to upgrade your air quality monitoring system with professional grade precision and reliability.
| Manufacturer | Merlin (S&S Northern) |
|---|---|
| Product Type | CO₂, Temperature & Humidity Room Sensor |
| CO₂ Detection Range | 400–5000 ppm (NDIR Diffusion Type) |
| Accuracy | ±5% FS @ 25°C |
| Response Time | t90 < 120s |
| Calibration | ABC Logic™ Self-Calibration |
| Temperature Range | 0–50°C (Accuracy ±0.5°C) |
| Humidity Range | 0–100% RH (Accuracy ±2%) |
| Outputs | 3x 0–10V analog (CO₂, Temp, RH), RS-485 (Modbus RTU / BACnet MS/TP), 1x SPST Relay 70mA, Thermistor 10K3 |
| Communication | RS-485 Digital – Up to 127 Devices |
| Power Supply | 12–24VDC / 24VAC (Low Voltage) or 230VAC Mains |
| Power Consumption | 5W Max |
| Enclosure | ABS Flame Retardant, IP40 Rated |
| Dimensions | 86 x 114 x 35mm (Low Profile: 86 x 114 x 25mm) |
| Mounting | Wall Mounted (½” 12.5mm Rear Entry) |
| Operating Temperature | -10°C to +50°C |
| Compliance | IGEM/UP/11, BS 50543, BS 61010-1, BS 50270 |
| Warranty | 3 Years |
Triple Sensor Design – Simultaneously monitors CO₂ (ppm), temperature (°C), and humidity (%RH) for complete indoor air quality analysis.
Wide Detection Range – Measures CO₂ levels from 400 to 5000 ppm with ±5% FS accuracy at 25°C.
Multiple Output Options – Supports analog 0–10V, RS-485 digital (Modbus RTU or BACnet MS/TP), and relay outputs for system flexibility.
Visual & Audible Alerts – Optional LED/TFT indication provides Green (OK), Yellow (Warning), and Red (Alarm) status lights for quick CO₂ level assessment.
Fully Calibrated & Long Life – Equipped with ABC Logic™ self-calibration and a lifespan exceeding 5 years.
Excellent Stability & Anti-Interference – Advanced circuitry ensures consistent readings and reliable performance in challenging environments.
UK Manufactured & Tested – Designed, built, and calibrated in the UK for professional-grade reliability.
Compliance & Safety – Conforms to IGEM/UP/11, BS 50543, BS 61010-1, and BS 50270 for full regulatory assurance.
3-Year Warranty – Backed by manufacturer confidence for long-term dependability.
