At Vacuum Engineering Services we specialise in bespoke helium leak detection machines that cater to all applications. Our machines fit into a few different categories. Keep reading to find out more and see some examples of our machines. If you are unsure of what sort of test you may need for your product, try out application finder or contact us directly to see if we can help.
Hard vacuum leak testing is currently one of the most widely used method. It involves placing the component within a vacuum chamber that is connected to a helium mass spectrometer. This method enables all joints to be tested with very high levels of sensitivity and reliability. It is the standard method for testing all leaks below 1 x10-3 mbar.l/sec. With this objective in mind our engineers will always design the machine you require in line with your technical requirements and within your financial possibilities.
Our technical options include:
- Single or multiple tracer gas systems
- Helium sniffer probes to help locate the leak path
- Manual or fully automatic or partial automatic systems
- Fully or partly integrated into manufacturing lines or stand-alone systems
- Production rates to suit your needs [our fastest is 14 parts per second!]
- Leak rates as low as 1.0 E-9 mbar·l/s
- Test pressure – to suit your needs
- Programming Software – to suit your needs
- Product traceability system (barcode reading, barcode printing, engraving, pin-dot marking, label-printing, data acquisition, data-storage)
- PLC/PAC types – to suit your needs (typically Rockwell/Allen-Bradley, Siemens, Mitsubishi, Omron, Toshiba, Wonderware/In-Touch)
- Ability to connect to your system remotely for repairs and troubleshooting
Accumulation Testing Systems
The advantages of hard vacuum leak testing without a vacuum system!
Leak testing products designed to contain liquids (1.0 e-1 to 1.0 e-3 mbar·litre/sec range) are generally either completed by pressure decay, mass flow or hard vacuum leak test machines.
Pressure decay & mass flow suffer from the fact that the pressure may also vary, not because of a leak but because of a change of temperature, or volume, as described in Boyle’s law. The result is the measurement of the leak is often smaller than the “noise” created by the temperature or volumes variation so the technique has problems in capably meeting the leak rate requirements.
Our AT (Accumulation Testing) Machine combines the benefits of hard vacuum leak testing with a much lower price to purchase and to operate.
Read more about Accumulation Testing
Sniff test systems are very good when there is a need to locate the position of a leak. They can be used as independent leak detectors, when the location of the leak is likely to be restricted to some critical and known points, or when the production rates are low and the leak detection test can be performed manually. They can also be used in conjunction with an automated helium leak detection system, to locate the position of the leak in rejects before these are sent to a re-work station.
Read more about Sniff Testing
This method consists of evacuating the part through a pump group integrated in a system where a helium detector is included. Once the component internal pressure reaches the pre-set vacuum level, helium is applied on its external surface (or on the most critical areas only). The application of helium can be manual or automated. In the event of a leak, helium reaches the internal part of the component which is kept under vacuum during the whole process. At this point the helium detector senses an increase of the tracer gas concentration and, if this is higher than the pass/fail limit, the part will be classified as a reject.
Read more about Spray Testing
Helium Recovery Systems
With the increasing costs of helium, nowadays it is important to make sure that the leak detection test operations use the minimum amount of tracer gas required for the test cycle and that helium wastes are reduced to the minimum.
In order to reduce the cost of helium, this can be mixed in different percentages with dry air or nitrogen; however it has to be reminded that by decreasing the percentage of helium, the sensitivity of the system is reduced, so this solution is possible only for certain applications.
When helium is used at 100%, and especially when it is used at high leak test pressures, a recovery system can be very convenient. Helium recovery systems help save money by enabling the helium used on a leak test to be recovered and reused in the following test cycles.
Read more about Helium Recovery Systems
Pressure / Vacuum Decay Testing Systems
Pressure decay systems provide a dry, operator independent test for identifying leaks for higher leak rate applications (generally in the range of 1×10-2 mbar·litre/sec). This technique is particularly suited to products with small internal volumes and rigid constructions, for which temperature changes do not affect the test results and the geometry of the components does not change with the internal pressure they are charged with.
Read more about Pressure / Vacuum Decay Systems
Central Vacuum Systems
Our specialist knowledge and experience gained in the vacuum systems industry enables us to offer a wide range of different vacuum systems. These vacuum systems can be offered at very competitive prices due to our purchasing power for vacuum components and parts, based on years of experience and presence in the field.
The most common helium leak detection solution based on a vacuum system consist of a vacuum chamber, a pump group, a helium supply and nitrogen supply, a leak detector, a PLC control unit and the related piping and framework.
Read more about Central Vacuum Systems