SECTION EIGHT

EFFECT OF PRESSURE

Virtually all gas sensors and analysers measure the partial pressure, not the percentage, of the gas that they sense. The only time that these instruments can accurately read percentages is when the total pressure does not vary over time between calibration and use. This is why it is important to calibrate the TED 191 Portable Oxygen Monitor at regular intervals.

It is recommended that the instrument be calibrated prior to each use or every 8 hours.

When the sensor is connected to a ventilator circuit, the alternating "breathing" pressure cycles generated by the ventilator will be sensed as an increase in the oxygen percentage (especially if the sensor is fast enough to sense the changes). In reality, the percentage of oxygen is not changing; it is the total pressure that is increasing, producing a corresponding increase in the partial pressure of oxygen. A hundred-centimeter water pressure pulse will produce a .11 atmosphere, or an 11% increase in the total and therefore partial pressure of oxygen. Assuming that the sensor is fast enough to track this pressure pulse, an unpressurised reading of 50% oxygen will increase to 55.3% if the sensor is subjected to a pressure cycle of 100cm H2O. The reading will rise proportionally less for smaller pressures.

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Analytical Instruments

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Teledyne TED 191 instruction manual Section Eight, Effect of Pressure
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TED 191 specifications

The Teledyne TED 191 is an innovative device designed to enhance various technologies in the realms of data acquisition and signal processing. This cutting-edge equipment has garnered attention for its outstanding performance, robustness, and versatility, making it a popular choice among professionals in numerous industries, including aerospace, military, and environmental monitoring.

The TED 191 features a compact form factor, enabling easy integration into existing systems without requiring significant modifications or additional space. This design is especially beneficial for applications requiring portability, as the device can be seamlessly transported and deployed in the field. Moreover, its rugged construction provides durability and reliability under harsh operating conditions, ensuring consistent performance even in challenging environments.

One of the standout characteristics of the Teledyne TED 191 is its advanced signal processing capabilities. The device is equipped with high-resolution analog-to-digital converters that enable the capturing of intricate waveforms with precision and accuracy. This is crucial for applications such as seismic monitoring and geophysical surveying, where minute variations in signals can carry significant implications.

In addition to its robust data acquisition features, the TED 191 supports multiple communication protocols, allowing for seamless integration with other systems and devices. This interoperability ensures that users can easily transfer data and remotely control the device, enhancing operational efficiency. The device is compatible with various software applications, further expanding its utility for users who require specialized analytics or data visualization.

Another notable technology embedded in the TED 191 is its real-time processing capabilities. This allows users to analyze incoming data instantaneously, facilitating timely decision-making. This feature is particularly valuable in critical applications like military operations and emergency response scenarios, where seconds count, and immediate information can influence outcomes.

In summary, the Teledyne TED 191 stands out as a highly capable tool for professionals demanding high performance and reliability in data acquisition and signal processing. Its compact design, advanced signal processing technologies, interoperability, and real-time analysis capabilities make it an essential device across various sectors. As industries continue to evolve and seek out cutting-edge technologies, the TED 191 remains at the forefront, setting a standard for performance and versatility.
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