PD ISO/TS 20177:2018

This standard PD ISO/TS 20177:2018 Vacuum technology. Vacuum gauges. Procedures to measure and report outgassing rates is classified in these ICS categories:

• 23.160 Vacuum technology

This document describes procedures to measure outgassing rates from components designed for vacuum chambers and of vacuum chambers as a whole. The outgassing rates are expected to be lower than 10⁻⁵ Pa m³ s⁻¹ (10⁻² Pa L s⁻¹) at 23 °C and to emerge from devices that are suitable for high or ultra-high vacuum applications. The molecular mass of the outgassing species or vapour is below 300 u.

The upper limit 10⁻⁵ Pa m³ s⁻¹ of total outgassing rate is specified independent of the size, the total surface area and texture or state of the outgassing material. If a specific outgassing rate (outgassing rate per area) is determined, the area is not a specific surface area including the surface roughness, but the nominal geometrical one. When it is difficult to determine the nominal geometrical surface area of the sample, such as powders, porous materials, very rough surfaces, or complex devices, mass specific outgassing rate (e.g. outgassing rate per gram) is used.

For many practical applications, it is sufficient to determine the total outgassing rate. If a measuring instrument, which sensitivity is gas species dependent, is used, the total outgassing rate are given in nitrogen equivalent. In cases, however, where the total outgassing rate is too high, the disturbing gas species is identified, and its outgassing rate is measured in order to improve the sample material. This document covers both cases.

Some outgassing molecules can adsorb on a surface with a residence time that is much longer than the total time of measurement. Such molecules cannot be detected by a detecting instrument when there is no direct line of sight. This is considered as a surface effect and surface analytical investigations are more useful than general outgassing rate measurements considered here. Also, molecules that are released from the surface by irradiation of UV light or X-rays, are out of the scope of this document.

This document is written to standardize the measurement of outgassing rates in such a way that values obtained at different laboratories and by different methods are comparable. To this end, for any of the described methods, traceability is provided to the System International (SI) for the most important parameters of each method and according to the metrological level.

Outgassing rate measurements by mass loss, which were mainly developed for testing of spacecraft and satellite materials, are not gas specific. For acceptable measurement times, mass loss measurements require significantly higher outgassing rates (>10⁻⁵ Pa m³ s⁻¹) than typical for high and ultrahigh vacuum components. Also, it is not possible to measure the sample in situ due to the weight of the vacuum chamber, since the balances are not vacuum compatible. For these reasons, mass loss measurements are not considered in this document.

It is assumed that the user of this document is familiar with high and ultra-high vacuum technology and the corresponding measuring instrumentation such as ionization gauges and quadrupole mass spectrometers.

PD ISO/TS 20177:2018 Vacuum Technology Standard

Welcome to the comprehensive guide on the PD ISO/TS 20177:2018, a pivotal standard in the realm of vacuum technology. This document is an essential resource for professionals and organizations involved in the design, implementation, and maintenance of vacuum systems. It provides detailed procedures to measure and report outgassing rates, ensuring precision and reliability in vacuum gauge operations.

Overview

The PD ISO/TS 20177:2018 standard is a technical specification that outlines the methodologies for measuring and reporting outgassing rates in vacuum systems. Released on June 13, 2018, this document is a critical tool for engineers and technicians who require accurate data to optimize vacuum system performance.

Key Features

• Standard Number: PD ISO/TS 20177:2018
• Pages: 48
• ISBN: 978 0 580 51206 3
• Status: Standard

Why This Standard is Essential

In the field of vacuum technology, understanding and controlling outgassing rates is crucial. Outgassing can significantly affect the performance and efficiency of vacuum systems. The PD ISO/TS 20177:2018 provides a standardized approach to measuring these rates, allowing for consistent and reliable data collection. This standard helps in:

• Ensuring the accuracy and reliability of vacuum gauges.
• Improving the performance and longevity of vacuum systems.
• Facilitating compliance with industry regulations and standards.
• Enhancing the quality of research and development in vacuum technology.

Detailed Content

The document spans 48 pages and is meticulously structured to cover all aspects of outgassing rate measurement. It includes:

• Definitions and terminologies related to vacuum technology.
• Detailed procedures for setting up and calibrating vacuum gauges.
• Step-by-step guidelines for measuring outgassing rates.
• Methods for analyzing and reporting data to ensure accuracy and consistency.

Who Should Use This Standard?

This standard is indispensable for:

• Engineers and technicians working in vacuum technology.
• Quality assurance professionals in industries utilizing vacuum systems.
• Researchers and developers focused on advancing vacuum technology.
• Organizations aiming to maintain high standards of precision and efficiency in their vacuum operations.

Benefits of Implementing PD ISO/TS 20177:2018

By adhering to the guidelines set forth in this standard, organizations can achieve:

• Enhanced accuracy in vacuum measurements, leading to better system performance.
• Reduced risk of system failures due to uncontrolled outgassing.
• Improved compliance with international standards and regulations.
• Increased confidence in the reliability of vacuum systems.

Conclusion

The PD ISO/TS 20177:2018 is more than just a standard; it is a comprehensive guide that empowers professionals in the vacuum technology industry to achieve excellence. By providing clear and precise procedures for measuring and reporting outgassing rates, this document ensures that vacuum systems operate at their optimal potential, delivering consistent and reliable results.

Invest in the PD ISO/TS 20177:2018 today and take a significant step towards enhancing the performance and reliability of your vacuum systems.