Selecting the correct vacuum gauge is essential for the success of a heat treat process. It is important to know how direct and indirect gauges work and what options are available so that a heat treater can make the right choice. There are many important considerations to make when using a vacuum gauge such as, gas composition, method of operation, gas sensitivity, as well as the process being performed.
“Measuring vacuum pressure is a fundamental element of all vacuum applications, but there’s no such thing as a universal vacuum gauge. When it comes to measuring vacuum pressure, no single gauge will respond accurately throughout the entire vacuum range (from atmospheric pressure to 10-12 mbar). That’s why a clear understanding of the differences between the types of gauges is essential to match them to the right operational contexts. In this blog post, we assess direct vs indirect gauges and unpack the core characteristics of each kind for you to more easily compare them.”
Source: Vacuum Science World