Description
The Vaisala GMW90 series offers highly reliable transmitters for measuring CO₂, temperature and relative humidity, specially designed for demand-controlled ventilation (DCV) systems in offices, schools and other buildings. Thanks to the innovative CARBOCAP® sensor with microglow technology, this series guarantees a long service life, low energy cost and excellent measuring accuracy.
The transmitters are available with both analogue and digital outputs (BACnet/Modbus) and can optionally be fitted with a display and CO₂ indicator LEDs. Calibration is simple thanks to interchangeable modules and the included traceable CO₂ calibration certificates.
Key features
- Measures CO₂ (0–5000 ppm), temperature (-5 to +55 °C) and optionally relative humidity (0–95 %RH)
- CARBOCAP® CO₂ sensor with excellent stability and low drift (< ±75 ppm over 5 years)
- Automatic reference measurement system for buildings occupied 24/7
- Fast and easy installation with modular construction (electronics can be fitted seamlessly after the construction phase)
- Easy calibration with interchangeable measurement modules (or via a handheld meter or reference gas)
- Available with voltage or current outputs, or as a digital version with BACnet/Modbus
- Traceable 3-point CO₂ calibration included
- Optional: traffic-light indication (CO₂ LEDs) and decorative covers
Technical specifications (excerpt)
CO₂:
- Measuring range: 0–5000 ppm
- Accuracy: ±(30–45 ppm + 2–3.8% of reading, depending on temperature)
- Sensor: Vaisala CARBOCAP® GM10
Temperatuur:
- Measuring range: -5 … +55 °C
- Accuracy: ±0.5 to ±0.8 °C
Relative humidity (optional):
- Measuring range: 0–95 %RH
- Accuracy: ±2.5 to ±5.0 %RH, depending on temperature and humidity
Outputs & communication:
- Voltage: 0–5/10 V, current: 0/4–20 mA
- Digitaal: BACnet MS/TP of Modbus RTU (RS-485)
- Power supply: 18–35 VDC or 24 VAC
Dimensions & mounting
- Dimensions: Compact design, white (RAL9003)
- Housing: ABS/PC, IP30
- Wall mounting with screw terminals (up to 2 mm²)
- Easy access to the service interface via a sliding cover
Applications
- HVAC-controlled ventilation in commercial buildings
- Energy-efficient air quality control
- Monitoring in offices, schools, hospitals and public buildings
Questions, or need technical advice or a tailored quote?
Feel free to contact us by email or phone.
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