20/04/2026
Maintaining SF6 breakers requires a thorough leak detection inspection. There are several methods to perform this task, and we’ll provide a brief overview to help you choose the best one for your team. The choice of method depends on whether you need to confirm a leak or pinpoint its exact location.
Handheld sniffers are the most common professional tools. They use high-voltage ionization or infrared (NDIR) technology to detect trace amounts of SF6 in the air. Start with high sensitivity to find the general area, then switch to low sensitivity to pinpoint the exact source.
Optical Gas Imaging (SF6 Cameras) specialize in infrared cameras, like the Fluke Ti450. These cameras visualize the gas plume as “black smoke” on a video screen, allowing for safe, non-contact inspection of live, high-voltage equipment from a distance.
The Soap Bubble Test is the cheapest method. It involves spraying a soapy solution (water and detergent mixture) onto suspected joints, flanges, or valves. If bubbles form, a leak is present.
Ultrasonic detectors pick up the high-frequency sound waves generated by pressurized gas escaping through small cracks. They are effective in noisy industrial environments but cannot measure the actual leak rate.
Leaks typically occur at “joined” points rather than through solid metal. Key areas to inspect include flanges and gaskets, which are the most frequent leak sites due to aging seals or improper tightening. Bushings and end caps often experience wear or corrosion over time. Valves and gauges should be checked for fill valves and connections for pressure monitoring tubes. Lastly, welds should be inspected, as pinhole leaks can occur due to manufacturing defects or rust pitting.
At intellirent, we have SF6 analyzers and various types of leak detection equipment for rent. Call us at 888-902-6111 for your needs.
