Theory of Operation

Model GFC7000TA Carbon Dioxide Analyzer

IR unaffected by N2 in Measurement Cell

IR IS affected by CO2 in Reference Cell

IRM

Source

R

GFC Wheel

Δ H

Photo-Detector

Figure 9-3: Measurement Fundamentals with GFC Wheel

As the GFC wheel spins, the IR light alternately passes through the two cavities. When the beam is exposed to the reference cell, the CO2 in the gas filter wheel strips the beam of most of the IR at 4.3μm. When the light beam is exposed to the measurement cell, the N2 in the filter wheel does not absorb IR light. This results in a fluctuation in the intensity of the IR light striking the photo-detector (See Figure 10- 3) that results in the output of the detector resembling a square wave.

9.1.3.2. The Measure Reference Ratio

The Model GFC 7000TA determines the amount of CO2 in the sample chamber by computing the ratio between the peak of the measurement pulse (CO2 MEAS) and the peak of the reference pulse (CO2 REF).

If no gases exist in the sample chamber that absorb light at 4.3μm, the high concentration of CO2 in the gas mixture of the reference cell will attenuate the intensity of the IR beam by 60% giving a M/R ratio of approximately 2.4:1.

Adding CO2 to the sample chamber causes the peaks corresponding to both cells to be attenuated by a further percentage. Since the intensity of the light passing through the measurement cell is greater, the effect of this additional attenuation is greater. This causes CO2 MEAS to be more sensitive to the presence of CO2 in the sample chamber than CO2 REF and the ratio between them (M/R) to move closer to 1:1 as the concentration of CO2 in the sample chamber increases.

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Teledyne gfc 7000ta operation manual Measure Reference Ratio, Measurement Fundamentals with GFC Wheel
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gfc 7000ta specifications

The Teledyne GFC 7000TA is a cutting-edge, high-performance gas flow calibrator designed for both laboratory and field applications. This instrument is renowned for its accuracy, versatility, and reliability, making it an ideal choice for various industries, including aerospace, environmental monitoring, and manufacturing.

One of the standout features of the GFC 7000TA is its advanced measurement technology. It utilizes state-of-the-art thermal mass flow meters, which allow for precise fluid measurement across a wide range of flow rates. This technology ensures highly accurate readings, which are essential for applications requiring stringent compliance with regulatory standards.

The GFC 7000TA is capable of accommodating various types of gases, making it particularly versatile. Users can calibrate flow for gases such as air, nitrogen, or carbon dioxide, providing flexibility in a multitude of applications. The device also supports dual-channel capabilities, allowing simultaneous measurement and calibration of two different gas types, enhancing productivity and efficiency in processes.

Another notable characteristic of the GFC 7000TA is its user-friendly interface. Equipped with a high-resolution touchscreen display, the device offers intuitive navigation and data visualization. Users can easily set parameters, view real-time measurements, and generate printed reports. This interface reduces the learning curve for new operators, allowing organizations to implement the GFC 7000TA with minimal training.

In addition to its advanced measuring capabilities, the GFC 7000TA features a robust design for durability in harsh environments. The instrument is compliant with various international standards, ensuring its reliability and performance in various conditions. Its portable form factor makes it convenient for fieldwork, while the rugged construction provides peace of mind for users working in demanding settings.

The GFC 7000TA also incorporates modern connectivity options. With built-in USB and Ethernet ports, users can easily integrate the device into their existing systems for data logging and remote monitoring. This connectivity feature enables real-time data access and enhances the potential for analysis and optimization of gas flow systems.

In summary, the Teledyne GFC 7000TA is a high-performance gas flow calibrator characterized by its advanced thermal mass flow measurement technology, versatility in accommodating various gases, user-friendly interface, and robust design. With its modern connectivity features, this instrument stands out as a vital tool for professionals seeking precision and reliability in gas flow applications.
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