CO₂ Probe GMP252

The Vaisala CARBOCAP® Carbon Dioxide Probe GMP252 is an intelligent, stand-alone, ppm-level probe. It's intended for measuring CO2 in agriculture, refrigeration, greenhouses, demanding HVAC applications, and for plant growth chamber manufacturers. It is suitable for harsh and humid CO2 measurement environments where stable and accurate ppm-level CO2 measurements are needed. The operating temperature range is -40 … +60 °C and the measurement range is 0 … 10 000 ppm CO2, and  even up to 30 000 ppm CO with a slightly reduced accuracy. 

The GMP252 can also be placed inside the Vaisala Radiation Shield DTR250 for measuring dynamically outdoor CO2 levels.

The GMP252 probe is part of the Indigo product family and can also be connected to the Indigo500 and Indigo200 series transmitters to extend its features, for example, for a display or relays. The GMP252 can also be used with with the free Insight PC Software.

For spot-checking, the ideal choice is the Handheld CO2 Meter GM70.

The GMP252 replaces the following discontinued products: GMM222 and GMT222. Spare parts and accessories for the GMP222 probe are still available and can be purchased in the Vaisala online store.

Measurement range 0 … 10 000 ppm CO2
Can be used for measurements even up to 30 000 ppm CO₂ 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
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Key Benefits

Easy to use and clean
The GMP252 is a all-in-one probe, which makes it easy and fast to install. The probe is resistant to dust and most chemicals, such as, H2O2 and alcohol-based cleaning agents. The probe's surface is smooth, which makes it easy to clean.
Reliable and accurate
With the wide operating temperature range, the GMP252 is suitable for a large number of applications. The probe provides accurate and stable measurements also in varying conditions.

Watch the video

Introduction to GMP251 and GMP252

Product Resources

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Accurate CO2 measurements in the food and beverage industry

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Customer Stories