Theory of Operation

Model GFC7000TA Carbon Dioxide Analyzer

9.3.3. Optical Bench & GFC Wheel

Electronically, the Model GFC 7000TA’s optical bench, GFC wheel and associated components do more than simply measure the amount of CO2 present in the sample chamber. A variety of other critical functions are performed here as well.

9.3.3.1. Temperature Control

Because the temperature of a gas affects its density and therefore the amount of light absorbed by that gas it is important to reduce the effect of fluctuations in ambient temperature on the Model GFC 7000TA’s measurement of CO2. To accomplish this the temperature of both the sample chamber and the GFC Wheel are maintained at constant temperatures above their normal operating ranges.

Bench Temperature: To minimize the effects of ambient temperature variations on the sample measurement, the sample chamber is heated to 48°C (8 degrees above the maximum suggested ambient operating temperature for the analyzer). The heat source is a strip heater attached to the underside of the chamber housing. The temperature of the sample chamber is sensed by a thermistor attached to the sample chamber housing.

Wheel Temperature: To minimize the effects of temperature variations caused by the near proximity of the IR Source to the GFC wheel on the gases contained in the wheel, it is also raised to a high temperature level. Because the IR Source itself is very hot, the set point for this heat circuit is 68°C. The heat source is a cartridge heater implanted into the heat sync on the motor. The temperature of the wheel/motor assembly is sensed by a thermistor inserted into the heat sync.

Both heaters operate off of the AC line voltage supplied to the instrument.

9.3.3.2. IR Source

The light used to detect CO2 in the sample chamber is generated by an element heated to approximately 1100oC producing infrared radiation across a broad band. This radiation is optically filtered after it has passed through the GFC Wheel and the sample chamber and just before it reaches the photo-detector to eliminate all black body radiation and other extraneous IR emitted by the various components of those components.

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Teledyne gfc 7000ta operation manual Optical Bench & GFC Wheel, Temperature Control, IR Source
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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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