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%CO_2.

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

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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, Indigo300, 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 Order form More in Docs.vaisala.com

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Product Resources

Video

On-site calibration of CO2 in a working incubator

Vaisala’s Application engineer Nevon Mansour demonstrates how to do on-site calibration of CO2 in a working incubator.

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Blog

Indigo500 series dual-probe support

Learn about the benefits of using two probes measuring either the same parameter or two different ones.

Customer Case

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What is a smart measurement probe and what makes it special?

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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.

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.

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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.

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Customer case

Boston IVF ensures ideal CO2 for embryos in assisted reproduction with Vaisala calibration

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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.

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Vaisala CARBOCAP® Sensor for measuring carbon dioxide

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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.

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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 ).

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