5 Ways of Finding Leaks Using Vacuum Leak Detector

Vacuum Leak Detector

The Vacuum Leak Detector is a non-contact device that allows the operator to simulate the vacuum of space and check for seemingly invisible leaks. The air pressure inside a vessel can be altered by a number of actions, but this will change the mass of the vessel and therefore its buoyancy. It will also initiate a partial vacuum inside the vessel, not possible with traditional vacuum gauges or venting from ports. A fully automated system then controls the flow of gas into the vessel to match actual evaporation rates, thereby simulating space-level vacuum conditions.

Eliminating leaks is important for a number of reasons air leak detectors are compressible, when air leaks into a process it can cause important changes in pressure or vacuum within the system. Also, because air molecules are small, many of them are not effectively removed when processed by a filter, thus decreasing the effectiveness of the product in processing air.

Leak Measurement 

A specific property in which you are interested, in our case it could be the volumetric flow rate of analysis. The next step is to determine how many area units are involved in the transmission of gas. This could be done by measuring the diameter of the perimeter around the leak, or for our case, it could be done by determining the length around the leak. After this has been done, you need to find out if this volume is equivalent to a certain volume known as its diameter.

Leaks detection method using a vacuum leak detector 

  • Spray Technique (Local Leak Test):

The Vacuum Method – Spray Technique (Local Leak Test) is a test method for gas measuring instruments and gas outlets that depend on absolute measurement principles and is also applicable to the determination of the residual level of gas in cylinder-type gas sources. When using this test method, all likely leak points, i.e. those most relevant to an instrument’s operating principle, must be traced with a measured flow quantity of test gas at a suitable speed until no further test gas can be detected by the instrument.

  • Sniffer technique

The sniffer technique is a non-destructive testing method used to detect leaks in pressurized equipment. A test object is filled with test gas to a higher pressure than the surrounding atmosphere. A sniffer tip is slowly moved along the outside of the test object at the area of interest, looking for gas leakage – any indication that the sniffer tip is venting unsuppressed gases can indicate a leak position.

  • Envelope Test According to the Positive Pressure Method

The test result is decisive in the process of attaining leak-tightness in the system. The positive pressure method makes it possible to detect even the smallest overall leakage, so it is particularly suitable for automated industrial leak testing. A pressurized test object, placed in a vacuum vessel connected to a helium detector, yields an integrated leak rate at the detector whose value can be read directly on its display.

  • Bombing test 

A “bombing test” is a sampling method of subjecting the internal components of a container to pressure, heat, and an inert atmosphere in order to determine if there is any gas leakage past the seal. It is commonly performed on new, high-volume production parts.

  • Envelope Test According to the Vacuum Method

A helium leak detector is an electronic device for detecting gas leaks. A special envelope can be placed over a counterpart object under test, to which the helium leak detector is then connected through a vacuum pump. With this test, one can determine whether a counterpart object has small holes or cracks in its surface. The evacuated test object enclosed by the flexible envelope cannot be damaged as a result of being exposed to ambient pressure or being damaged by going through a pressure cycle.

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The Vacuum is one of the most under-appreciated pieces of equipment ever invented. Without it, freeze-dried foods, refrigerators, and air conditioning would be impossible. It forms the surface of every silicon microchip and is still necessary for the manufacture of many electronic devices.