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 Buy Now Contact us Datasheet Order form Part of the Indigo product family 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 Indigo80 Handheld indicator. 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 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. Product documentation Datasheets User guides More in Docs.vaisala.com More downloads Brochure: Vaisala Indigo Family catalog (2.63 MB) Application Note: How to measure carbon dioxide (1.64 MB) Application Note: Measuring CO2 in Refrigeration Applications (126.56 KB) Application Note: CO2-Indoor-air-in-animal-husbandry-application-note-B211525EN.pdf (1.45 MB) Brochure: Efficiency and Sustainability for the Food Industry (1.9 MB) Pagination Next page ›› Product Resources Blog Indigo500 series dual-probe support Learn about the benefits of using two probes measuring either the same parameter or two different ones. Read more Success story 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, and by demonstrating the viability of the process, the researchers believe that they have developed a key technology in the fight against climate change. Learn more Blog What is a smart measurement probe and what makes it special? Environmental measurement devices are also becoming smart. Unlike in the past when measurement probes could not be used on their own, the new wave of smart measurement probes can operate independently without additional transmitters. Learn 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 Australia’s eastern seaboard for more than two decades. Director Bruce Townsend tells us why Vaisala’s measurement sensors are his number-one choice for maintaining optimal conditions in the controlled storage atmospheres that his customers rely on. Read more Webinar Benefits of measuring CO2 reliably in cold storage applications CO2 needs to be carefully controlled, for example, in vegetable storage facilities, fruit-ripening rooms, frozen foods, food transportation companies, supermarkets, industrial refrigerators, breweries, wineries, logistics hubs and terminals, and storage and transportation of dry ice. Register to watch Blog Accurate CO2 measurements in the food and beverage industry Whatever the end product, process, or need, the goals are similar in almost all applications: a CO2 measurement that accurately reflects the environment and meets the application requirements. Learn 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. Since 1986, reproductive treatment through Boston IVF has resulted in 90,000 births. Boston IVF’s embryo incubators are one of the most important pieces of equipment at their facilities. 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, technical and feed industries. The company is jointly owned by Associated British Foods and Altia Corporation, a publicly held beverage company that focuses on wines and spirits and operates in the Nordic and Baltic countries. The biological process used to produce the enzymes is called fermentation and Roal produces enzymes in submerged fermentation units. 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 miniaturizing the Fabry-Perot Interferometer (FPI) was born, leading to collaborative development work with VTT. Learn more Customer case Maintaining harvest fresh apples Controlled atmosphere (CA) storage is a widely used technique for long-term storage of freshly picked fruits and vegetables. Historically, CA storage has been the primary method for the long-term storage of apples. Through a biological process called respiration, apples take in oxygen and generate carbon dioxide, water, and heat. Read more Customer case How to preserve 18,000 years of artwork Discovered in 1940, the painted cavern of Lascaux in the Southwestern France’s Dordogne region is the most famous ornamental prehistoric cave of the world. The cave consists of a large amount of images of animals such as bisons, aurochs, deers, horses, lions, and rhinos as well as monumental hunting scenes and different objects and signs. Learn more White paper Ventilation system clears the air in turkey farm By introducing a ventilation system based on the measurement of carbon dioxide, a Finnish turkey farmer was not only able to improve the living environment for his indoor reared turkeys but also made savings in his energy bills. The system is based on the Vaisala CARBOCAP® Carbon Dioxide Transmitter GMT222 ( *GMT222 is replaced by the GMP252 ). Learn more
Brochure: Vaisala Indigo Family catalog (2.63 MB) Application Note: How to measure carbon dioxide (1.64 MB) Application Note: Measuring CO2 in Refrigeration Applications (126.56 KB) Application Note: CO2-Indoor-air-in-animal-husbandry-application-note-B211525EN.pdf (1.45 MB) Brochure: Efficiency and Sustainability for the Food Industry (1.9 MB) Pagination Next page ››
