The Vaisala CARBOCAP® Carbon Dioxide Probe GMP252 is an intelligent, stand-alone, ppm-level probe for measuring CO₂ in agriculture, refrigeration, greenhouses and demanding HVAC applications. It is suitable for harsh and humid CO₂ measurement environments where stable and accurate ppm-level CO₂ measurements are needed.

The GMP252 is based on Vaisala’s unique, second-generation CARBOCAP® technology that enables exceptional stability. A new type of infrared (IR) light source is used instead of the traditional incandescent light bulb, which extends the lifetime of the GMP252.

The GMP252^*) probe can be connected to the Indigo 200 Series host devices to extend its features, for example, for a display or relays.

The warranty for the GMP252 is 24 months.

• Measurement range 0 … 10 000 ppmCO₂
• Can be used for measurement even up to 30 000 ppmCO₂ with reduced accuracy
• Intelligent, stand-alone probe with analog (V, mA) and digital outputs (RS485 with Vaisala protocol or Modbus)
• Superior long-term stability with the 2nd-gen proprietary CARBOCAP® technology
• Wide operating temperature range -40 … +60 °C
• IP65 classified housing
• Full temperature and pressure compensations
• Integrated temperature measurement for CO₂ compensation purposes
• Compensations for background gases: O₂, and humidity
• Sensor head heated to prevent condensation

The optional DTR250 radiation shield for Vaisala CARBOCAP® Carbon Dioxide Probe GMP252 protects the probe from solar radiation and precipitation in outdoor installations.