FAQs

Wet leak detectors use an oil sealed pump in their vacuum system, which offers strong sensitivity but requires more maintenance and can contaminate sensitive processes. Dry leak detectors use oil free pumps instead, making them better suited for clean environments like semiconductor fabs, though they historically had a harder time recovering from helium contamination. Newer dry models, like Leybold's PHOENIX Quadro Dry Plus, have closed much of that performance gap.

Semiconductor applications typically call for a dry, oil free detector to avoid contaminating an ultra clean vacuum environment, along with high sensitivity for detecting extremely small leaks. Automotive production usually prioritizes speed and throughput for testing components like fuel systems and AC parts on a production line, so a durable, fast cycling detector matters more than ultra high sensitivity. Talking through your specific tolerances and environment with a Vacumetrics specialist is the fastest way to land on the right model.

Sensitivity requirements depend on the component's function and the consequences of a leak, expressed as a leak rate in mbar·L/s. Aerospace, semiconductor, and hermetically sealed electronic components often require detection down to the 10⁻¹² mbar·L/s range, while less critical industrial applications can work with less sensitive equipment. Your quality standards, industry regulations, or customer specifications usually dictate the number you need to hit.

Vacuum leak testing pressurizes or evacuates a sealed part and measures helium passing through the detector's own vacuum system, which is generally the more sensitive method. Sniffer leak testing uses a handheld probe to sample ambient air near a part that's been filled with helium, which is faster and more flexible for large or hard to evacuate assemblies but less sensitive overall. Many facilities use both methods depending on the part and the stage of production.

A leak detection cart is a mobile, self-contained setup that houses a leak detector along with supporting components like pumps, gauges, and accessories for easy movement around a facility. It's  an inexpensive solution that gives you the flexibility to  test in multiple locations, in multiple locations on  a production floor, or in tight spaces where a fixed installation isn't practical. Standard cart configurations are available from Vacumetrics to suit most of your needs but custom carts can be built for specific facility needs.

New equipment comes with full manufacturer warranties, typically two to three years  and the latest technology, which matters most in high stakes or regulated environments. Given the long life expectancy of a modern leak detector, the annual cost of a new machine is quite reasonable. Certified or refurbished units can offer solid performance at a lower cost for facilities with less demanding requirements, as long as they've been properly serviced and calibrated. A Vacumetrics specialist can help you weigh the tradeoff based on your application and budget.

A part is either filled with helium and monitored from the outside, or placed under vacuum while helium is sprayed around it from the outside. The leak detector's mass spectrometer draws in gas from the test setup and identifies the presence of helium atoms that have passed through any leak path. The size of the detected helium signal corresponds to the size of the leak, which the detector reports as a leak rate.

Helium is a small, light, inert molecule, which lets it pass through even microscopic leak paths that larger gas molecules can't. It's also naturally rare in the atmosphere, at roughly 5 parts per million, so background interference is minimal and any helium detected is likely coming from the test part. On top of that, it's non-toxic, non-flammable, and inexpensive relative to other trace gases used in leak testing.

Background suppression is a function that filters out residual helium that has accumulated in a leak detector's system from repeated testing, so it doesn't get mistaken for a leak signal from the current test. INFICON's I-ZERO is one implementation of this, allowing continuous leak testing at background levels significantly lower than would otherwise be possible. This is especially useful in high volume testing environments where helium can build up quickly.

Acceptable leak rates vary widely by industry and application, but many hermetically sealed electronic and aerospace components are tested against standards like MIL-STD-883 Method 1014, which defines specific leak rate thresholds based on package size. Medical devices and other critical components often have their own regulatory or customer driven leak rate specifications. There isn't a single universal number, so the right threshold depends on the standard or specification governing your part.

The mass spectrometer inside a leak detector ionizes the gas sample it draws in, then uses a magnetic field to separate ions by their mass to charge ratio. Because helium has a distinct, light mass, the instrument can isolate and measure helium ions separately from all the other gases present in the sample. The resulting ion current is converted into a leak rate reading that the technician can interpret.

Most facilities calibrate the internal leak in their leak detectors on a schedule ranging from six to twelve months, although an annual calibration and service is most common. At the beginning of each day or shift the leak detector uses the internal calibrated leak to check the system functionality and calibration. Depending upon the criticality of the parts being tested, and any regulatory or customer requirements, other calibration cycles might be required Equipment used in high volume or high stakes environments, like aerospace or medical device manufacturing, often needs more frequent calibration. A Vacumetrics technician can help you build a maintenance schedule around your specific usage pattern.

NIST-certified calibration means a leak detector's measurements have been verified against reference standards that trace back to the National Institute of Standards and Technology, confirming the equipment reads leak rates accurately. This traceability is often a requirement for quality systems like ISO 9001 and for industries such as aerospace, defense, and medical devices. Without it, you have no independent assurance that your equipment's readings are trustworthy.

Turnaround time depends on the issue, the part availability, and whether the equipment needs to be shipped in or can be serviced on-site. Annual preventative maintenance and calibrations are less than a full day and can be scheduled at your convenience. Complicated repairs involving  replacement of electronics or the rebuilding of turbo molecular pumps may take a week or more. Vacumetrics stocks the typical wear part such as ios sources and valve rebuild kits for quick turn-around.

Yes, Vacumetrics services all makes and models, not only of helium leak detectors but also any make and model of the associate  vacuum pumps.Our history  of servicing your entire helium leak detector fleet lets you work with a single vendor for new systems, maintenance, repairs and parts with a single point of contact. We also keep your equipment in our database so we can track your systems service history and make proactive suggestions for service.

A preventative maintenance service includes a scheduled inspection, cleaning of the valve block and o-ring replacement, a calibrated leak swap, and replacement of wear items like filaments as required. The goal is to catch small issues before they turn into costly downtime or a failed calibration. Services are tailored to your equipment's usage level and operating environment.

Vacumetrics technicians travel to customer sites throughout the East Coast to service equipment ranging from single units to large fleets, in settings like production facilities, labs, clean rooms, and secure environments. Some repairs may still require equipment to be shipped in, depending on the complexity of the issue. Reach out with your equipment and location, and we can advise on the best path.

Vacumetrics is based just south of Boston in East Taunton, Massachusetts, and our technicians travel throughout the Northeast and East Coast for on-site service calls. We understand that timely service is required and will make every effort to travel where you need us. If you're unsure whether your location falls within our service range, it's easiest to just ask.

Downtime on leak detection equipment can hold up production, so our team prioritizes getting equipment back in service as quickly as possible. Exact availability for expedited service depends on current workload and the nature of the issue, so it's best to contact us directly when you have an urgent need. Typically we can accommodate next day service requests.

Aerospace and defense components are often tested against standards like MIL-STD-883 for hermetically sealed electronics, along with customer-specific and program-specific leak rate specifications. Facilities serving this industry also frequently need NIST-traceable calibration records and, in some cases, cleared or credentialed technicians for work in secure environments. Requirements vary by program, so it's worth confirming the exact specification your parts need to meet.

Medical devices with sealed components, such as implantables, drug delivery systems, and diagnostic equipment, generally must meet leak testing standards tied to patient safety and regulatory approval, often referencing ASTM standards or device-specific FDA requirements. Manufacturers typically need documented, traceable calibration to demonstrate their testing process is reliable. The specific leak rate threshold depends on the device and its intended use.

Semiconductor fabrication depends on ultra-high vacuum conditions, where even tiny leaks can introduce contaminants that ruin a batch. Helium leak detectors are used to verify the integrity of vacuum chambers, process gas lines, and system components before and during production to catch leaks that could compromise yield. Dry, oil-free leak detectors are typically preferred in this setting to avoid introducing additional contamination.

HVAC and refrigeration leak testing focuses on verifying that refrigerant circuits and pressure systems are properly sealed, both for performance and for compliance with refrigerant handling regulations. Helium leak detection offers a more sensitive alternative to traditional refrigerant leak detection methods, particularly during manufacturing and quality control. Requirements can vary based on the refrigerant type and applicable environmental regulations.

Vacumetrics services equipment at facilities requiring cleared and credentialed technicians, including some of the industry's most demanding defense and aerospace environments. Our team approaches every job, especially in secure or sensitive settings, with the professionalism and discretion those environments require.

Vacumetrics stocks a wide range of OEM and aftermarket parts for helium leak detectors and vacuum pumps, including electronics, filters, ion sources, lubricants, system components, gauges, and valves. Having a reliable parts source on hand helps minimize downtime when something needs replacing. If you're not sure which part you need, our technicians can help identify it.

Sensitivity loss is often caused by a contaminated or degraded ion source, a worn filament, helium background buildup, or a pump that's no longer reaching its rated vacuum level. Routine calibration checks usually catch this drift before it becomes a bigger problem. We also suggest an inlet filter if the system is used in a harsh environment. If you're noticing a gradual decline in performance, it's worth scheduling a service check rather than waiting for a full failure.

Common causes include a contaminated or damaged ion source, an internal leak in the detector itself, worn pump components, or an out-of-spec calibrated test leak. Environmental factors, like excessive helium background in the room, can also throw off a calibration attempt. A technician can usually pinpoint the cause through diagnostic troubleshooting.

Signs that an ion source needs attention include declining sensitivity, unstable readings, longer pump-down or response times, or difficulty passing calibration. Ion sources are a wear item with a finite lifespan and generally need periodic replacement as part of normal maintenance. If your equipment is showing any of these symptoms, it's a good candidate to check during your next service visit.

Filament and ion source lifespan varies by usage intensity, operating environment, and model, but many are rated for a few years of typical use. Detectors with dual filaments, like INFICON's UL and the Leybold Phoenix series, are often built with an extended warranty on the ion source to account for this wear pattern.

Yes, Vacumetrics has been named one of INFICON's PRIME Distributors in North America, a distinction held by fewer than six distributors on the continent, as well as a Leybold dealer and Authorized Service Provider. This recognition reflects both technical expertise and a mutual trust, as we essentially operate as a service extension of our supplier partners.

Vacumetrics has been serving the helium leak detection industry since 2003, bringing over two decades of experience to customers across aerospace, defense, communications, science, and automotive industries.