In the past, it was difficult to find feedthroughs and wire or line bushings that you could customize to your needs while meeting UL and other compliance standards for hazardous locations. Now, however, there’s an approach to feedthrough and wire bushing design that makes it far easier to meet all the relevant regulations without sacrificing design freedom. The key to this approach involves the use of epoxies to create hermetic seals around the wires.
Hermetic sealing technology keeps switchgear up and running by safeguarding power distribution equipment against environmental ingress.
Epoxy-based hermetic feedthroughs have worked well in cryogenic systems for years. But the design modifications needed to operate in these extremely cold temperatures increased the size of the feedthrough and limited your mounting options. We recently eliminated these issues with an entirely new approach to cryogenic feedthrough design.
From automotive electronic control units to weather satellites and defense systems, electronics failures can bring communications and critical functions to a sudden halt. Experts specializing in electronics failure analysis can list a host of reasons for various malfunctions, but one of the most common causes is simple moisture.
Engineers who work with pressure and vacuum chambers usually reach for off-the-shelf sealed bulkhead connectors when they need to pass power and signal wires through the chamber wall. And while these connectors may seem like the best or only way to breach
the chamber walls, they can actually drive cost, impose unnecessary mechanical design constraints and trigger electrical problems. So what’s the alternative? Wire feedthroughs hermetically sealed with epoxy.
The importance of natural gas as an energy source for the United States has grown steadily since the mid-1990s. With continued political instability plaguing many of the world’s major energy producers, North American natural gas reserves provide
an attractive option for energy independence. Natural gas is an attractive fuel because it is clean-burning and efficient, and according to the Energy Information Association, natural gas demand is expected to rise by more than 20 percent by 2030.
The purpose of this white paper is to share the details and knowledge that engineers at Douglas Electrical have gained over the years regarding the specification and sourcing of hermetic seals and feedthroughs used in space simulation vacuum chamber applications.
Having worked with most major space simulation facilities over the years, it is our hope that by sharing these observations, vacuum chamber test engineers both experienced and inexperienced will have an easier time solving the typical problems that can
occur in feedthrough applications.
“When we really sat down and looked at the challenges we faced, we realized a Lean initiative could provide the solution. But we’re a job shop, manufacturing a wide variety of custom-engineered products in runs sizes ranging from a few samples
to a few hundred thousand. At Douglas, we do something different every day. We knew Lean worked in large corporations like the automotive industry, but we initially were not sure what the net would be for our type of business,” said Douglas.
The purpose of this paper is to share the experience and knowledge that engineers at NASA and Douglas Electrical have gained regarding the specification of hermetic seals and feedthroughs used in engine test stand vacuum chamber applications. This paper
looks specifically at the experience and solutions used in the new A-3 test stand that is being constructed at the NASA Stennis Space Center.