Troubleshooting

Model GFC7000TA Carbon Dioxide Analyzer

10.4.2. Excessive Noise

Noise is continuously monitored in the TEST functions as the STABIL reading and only becomes meaningful after sampling a constant gas concentration for at least 10 minutes. Compare the current STABIL reading with that recorded at the time of manufacture (included in the GFC 7000TA Final Test and Validation Data Sheet-p/n 04271 shipped with the unit from Teledyne Instruments).

1.The most common cause of excessive noise is leaks. Leak check and flow check the instrument described in Section 9.3.

2.Detector failure – caused by failure of the hermetic seal or over-temperature due to poor heat sinking of the detector can to the optical bench. In addition to increased noise due to poor signal- to-noise ratio, another indicator of detector failure is a drop in the signal levels of the CO2 MEASURE signal and CO2 REFERENCE signal.

3.Sync/Demod Board failure. There are many delicate, high impedance parts on this board. Check the CO2 MEAS and CO2 REF Test Functions via the Front Panel Display.

4.The detector cooler control circuit can fail for reasons similar to the detector itself failing. Symptoms would be a change in MR RATIO Test Function when zero air is being sampled.

Also check the SIGNAL I/O parameter PHT DRIVE. After warm-up, and at 25oC ambient, if PHT DRIVE < 4800 mV, the cooler is working properly. If PHT DRIVE is > 4800 mV there is a malfunction.

5.The +5 and ±15 VDC voltages in the GFC 7000TA are provided by switching power supplies. Switch mode supplies create DC outputs by switching the input AC waveform at high frequencies. As the components in the switcher age and degrade, the main problem observed is increased noise on the DC outputs. If a noisy switcher power supply is suspected, attach an oscilloscope to the DC output test points located on the top right hand edge of the Relay board. Look for short period spikes > 100 mV p-p on the DC output.

Teledyne Analytical Instruments

240

Page 257 Page 259
Page 258
Image 258
Teledyne gfc 7000ta operation manual Excessive Noise
Page 257 Page 259

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.
Top Page Image Contents