Datasheet Contact Us Buy Now CO₂ Probe GMP251 for %-level measurements in life science incubators, cold storage facilities and all demanding applications The Vaisala CARBOCAP® Carbon Dioxide Probe GMP251 is an intelligent, stand-alone, %-level probe for measuring CO2 in life science incubators, cold storage facilities, fruit and vegetable transportation, and in all demanding applications where stable and accurate percentage-level CO2 measurements are needed. The operating temperature range is -40 … +60 °C and the measurement range is 0 … 20%CO2. The GMP251 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 GMP251. It has full temperature and pressure compensations of CO2 measurement – integrated temperature measurement for compensation purposes. The sensor head is heated to prevent condensation. Digital output over RS-485: Modbus & Vaisala Industrial Protocol. A calibration certificate is always included with the product The GMP251 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 GMP251 can also be used with with the free Insight PC Software. For spot-checking, the ideal choice is the Handheld CO2 Meter GM70. The GMP251 replaces the following discontinued products: GMM221 and GMT221. Please note that spare parts and accessories for the GMP221 probe are still available and can be purchased in the Vaisala online store. For an introduction to the product, see the video below. Features Measurement range 0 … 20 %CO₂ Intelligent, stand-alone probe with analog (V, mA) and digital (RS485) outputs 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 GMP251 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 GMP251 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 probes Downloads Datasheet (215.3 KB) GMP251 Carbon Dioxide Probe Download the Datasheet Datasheet: GMP251 Carbon Dioxide Probe (215.3 KB) Manual: Spray Shield ASM212017SP Quick Guide (282.07 KB) Brochure: Vaisala Indigo Family brochure (1.5 MB) Datasheet: Indigo200 Series Transmitters For Vaisala Smart Probes Manual: Relay Box for GMP250 Probes Quick Guide (619.36 KB) Datasheet: Indigo520 Transmitter Application Note: CO2 Measurement in Breweries and Wineries (131.3 KB) Manual: GMP251 Quick Guide in English (292.86 KB) All downloads Product Resources Indigo500 series dual-probe support Read more What is a smart measurement probe and what makes it special? Read more Benefits of Measuring CO2 Reliably in Cold Storage Applications Read more Accurate CO2 measurements in the food and beverage industry Read more Customer Stories Customer case Decarbonization technology proven at Waste-to-Energy plant Danish researchers have demonstrated that it is possible to remove most of the carbon dioxide (CO2) from the emissions of a waste incinerator... Read more 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 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 CO2 measurements for fermentation Roal Ltd is one of the world´s largest enzyme companies producing enzymes for different industrial applications, for example, for baking, food... Read more Customer case Vaisala CARBOCAP® Sensor for measuring carbon dioxide The CARBOCAP® story began in 1992, when micromechanical sensors were being intensively researched at Vaisala. The groundbreaking idea of... Read more Customer case Maintaining harvest fresh apples Controlled atmosphere storage requires accurate carbon dioxide measurements Controlled atmosphere (CA) storage is a widely used technique for... Read more Customer case How to preserve 18,000 years of artwork Monitoring carbon dioxide in the harsh environment of the prehistoric ‘Sistine Chapel’ of Dordogne, France. Discovered in 1940, the painted... 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 Services Standard calibration Accredited calibration Need support? Need to calibrate? Sign up for news Contact us
Customer case Decarbonization technology proven at Waste-to-Energy plant Danish researchers have demonstrated that it is possible to remove most of the carbon dioxide (CO2) from the emissions of a waste incinerator... Read more
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 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 CO2 measurements for fermentation Roal Ltd is one of the world´s largest enzyme companies producing enzymes for different industrial applications, for example, for baking, food... Read more
Customer case Vaisala CARBOCAP® Sensor for measuring carbon dioxide The CARBOCAP® story began in 1992, when micromechanical sensors were being intensively researched at Vaisala. The groundbreaking idea of... Read more
Customer case Maintaining harvest fresh apples Controlled atmosphere storage requires accurate carbon dioxide measurements Controlled atmosphere (CA) storage is a widely used technique for... Read more
Customer case How to preserve 18,000 years of artwork Monitoring carbon dioxide in the harsh environment of the prehistoric ‘Sistine Chapel’ of Dordogne, France. Discovered in 1940, the painted... 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