Vaisala GMW90 Series CO2, Temperature & Humidity Transmitter


  • Measured parameters: carbon dioxide, temperature, and humidity (optional).
  • Superior long-term stability with the latest-generation Vaisala CARBOCAP sensor.
  • Accurate temperature and humidity measurements due to the low-power microglow infrared source.
  • Quick and easy installation and maintenance.
  • Calibrated, user-exchangeable measurement modules.
  • 3-point traceable CO2 calibration (certification included).
  • Both analog and field bus communication (Modbusâ RTU).

Dpstar is a leading supplier of environmental measurement sensors for temperature, relative humidity, pressure, dew point, CO2, and other environmental condition monitoring for industrial process application and research. Since the ’90s, we earned a reputation as a trusted partner to our clients through our commitment and dedication. We are an authorized distributor and supplier of measuring sensors solutions from renowned manufacturers Vaisala. Vaisala is a global leader in environmental and industrial measurement. Building on 80 years of experience, Vaisala provides observations for a better world. Vaisala is a reliable partner for customers around the world, offering a comprehensive range of innovative observation and measurement products and services.

Vaisala GMW90 Series CARBOCAP Transmitters, mounted on walls, are great for green building projects and controlling ventilation based on demand. They measure carbon dioxide and temperature, with an option for humidity measurement. They come with a calibration certificate meeting traceability and compliance needs. Maintaining traceability is easy with interchangeable intelligent measurement modules. You can customize the transmitter to match the interior design using a decorative cover. Instruments bought in 2021 and later have a 5-year warranty.


Key Benefits

Easy Installation

Vaisala GMW90 Series Transmitters have been designed for quick and easy installation. Every model includes a display for easy startup. To protect the sensor from dust and dirt during construction and installation, the units can be cabled with back-plate only. Electronics can be snapped on later at an appropriate phase in the construction project. This saves installation time in the project.

Convenient Calibration

Regular instrument maintenance guarantees a long product lifetime although the transmitter’s inspection interval is five years. Calibration is easiest using the exchangeable measurement modules. Sensor traceability and measurement quality is easily maintained by snapping on a new module calibrated at Vaisala factory. The instrument can also be calibrated using a hand-held meter or reference gas CO2 bottle. The service interfaces are easy to reach by simply sliding the cover down. The closed cover keeps the measurement environment stable during calibration and ensures a top-quality final result.


Vaisala GMW90 Series CO2 Temperature & Humidity Transmitter_DpstarGroup