Datasheet Contact Us Buy Now CO₂ Probe GMP252 for ppm-level measurements in agriculture, refrigeration, demanding HVAC, and for plant growth manufacturers 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 CO2 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. Features 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 + Show more 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 Downloads Datasheet (243.57 KB) GMP252 Carbon Dioxide Probe Download the Datasheet Application Note: Technological Breakthroughs Necessary to Secure Food Supplies for Growing World Population (182.51 KB) Comparison table: Comparison of GMT222 vs GMP252+Indigo201 (161.38 KB) Datasheet: Insight PC software Brochure: Vaisala Indigo Family brochure (1.5 MB) Brochure: Efficiency and Sustainability for the Food Industry (1.9 MB) Application Note: Infrared Sensor Technology and its Impact on HVAC CO2 Measurement Accuracy (191.73 KB) Application Note: CO2 Measurements in Breweries and Wineries Customer case: Employing Vaisala’s CO2 sensors in the scientific greenhouse (1.45 MB) All downloads Product Resources Indigo500 series dual-probe support Read more What is a smart measurement probe and what makes it special? Read more Tips on how to measure CO2 in demanding conditions Read more Accurate CO2 measurements in the food and beverage industry Read more Customer Stories Customer case A fruitful partnership with Cool Dynamics Refrigeration (Qld), Australia Cool Dynamics Qld has been delivering commercial and industrial refrigeration solutions to the fruit and vegetable supply industry across... Read more Customer case Why climate control systems provider Damatex chose Vaisala sensors for their greenhouse customers Climate control systems are revolutionizing greenhouses, HVAC and building automation. Read how Damatex uses Vaisala technology to achieve... Read more Customer case Employing Vaisala’s CO2 sensors in the scientific greenhouse Scientists at Wageningen University & Research in the Netherlands have employed Vaisala carbon dioxide sensors in their research greenhouses for... Read more Customer case Vaisala probes facilitate rollout of environmentally friendly refrigeration Supermarkets all over Australia and New Zealand are benefiting from advanced carbon dioxide monitors as new natural refrigeration systems are... Read more Customer case Boston IVF ensures ideal CO2 for embryos in assisted reproduction with Vaisala calibration Boston IVF provides Assisted Reproductive Technology including in vitro fertilization (IVF) in 28 locations throughout the greater Boston area... Read more Customer case Ventilation system clears the air in turkey farm Breeding turkeys indoors requires careful control of air quality, ventilation and heating. Proper control using CO2 sensors can result in... Read more Customer case Technological breakthroughs necessary to secure food supplies for growing world population The world population is expected to reach almost 10 billion by year 2050. This will lead to a massive demand for animal proteins, which implies... Read more Customer case Carbon dioxide modules contribute to understanding the environmental impact of nanomaterial “Vaisala’s probes were fully integratable and could operate in our low-voltage conditions. Calibration of the units was spot on and we started... Read more Customer case Setting the standard in tissue engineering Tissue engineering offers the promise of off-the-shelf products containing living human cells. Organogenesis Inc. has turned this science... Read more Services Standard calibration Accredited calibration Need support? Need to calibrate? Sign up for news Contact us
Customer case A fruitful partnership with Cool Dynamics Refrigeration (Qld), Australia Cool Dynamics Qld has been delivering commercial and industrial refrigeration solutions to the fruit and vegetable supply industry across... Read more
Customer case Why climate control systems provider Damatex chose Vaisala sensors for their greenhouse customers Climate control systems are revolutionizing greenhouses, HVAC and building automation. Read how Damatex uses Vaisala technology to achieve... Read more
Customer case Employing Vaisala’s CO2 sensors in the scientific greenhouse Scientists at Wageningen University & Research in the Netherlands have employed Vaisala carbon dioxide sensors in their research greenhouses for... Read more
Customer case Vaisala probes facilitate rollout of environmentally friendly refrigeration Supermarkets all over Australia and New Zealand are benefiting from advanced carbon dioxide monitors as new natural refrigeration systems are... Read more
Customer case Boston IVF ensures ideal CO2 for embryos in assisted reproduction with Vaisala calibration Boston IVF provides Assisted Reproductive Technology including in vitro fertilization (IVF) in 28 locations throughout the greater Boston area... Read more
Customer case Ventilation system clears the air in turkey farm Breeding turkeys indoors requires careful control of air quality, ventilation and heating. Proper control using CO2 sensors can result in... Read more
Customer case Technological breakthroughs necessary to secure food supplies for growing world population The world population is expected to reach almost 10 billion by year 2050. This will lead to a massive demand for animal proteins, which implies... Read more
Customer case Carbon dioxide modules contribute to understanding the environmental impact of nanomaterial “Vaisala’s probes were fully integratable and could operate in our low-voltage conditions. Calibration of the units was spot on and we started... Read more
Customer case Setting the standard in tissue engineering Tissue engineering offers the promise of off-the-shelf products containing living human cells. Organogenesis Inc. has turned this science... Read more