Leak Test & Leak Rate
A leaky glovebox constantly consumes inert gas and allows oxygen and moisture to enter. The overpressure test shows just how airtight your glovebox really is. We'll explain the procedure.
Leak-tightness—along with gas purification—is the foundation of a properly functioning inert gas atmosphere. Even effective gas purification is no match for a leaky chamber: oxygen and moisture constantly seep in, causing levels to rise and gas consumption to become unnecessarily high.
What does the leak rate mean?
The leak rate describes how much inert gas a chamber loses per unit of time—or how much ambient air enters. The lower the rate, the better. A leak-tight chamber maintains the low O₂/H₂O level once achieved for a long time and requires only a small amount of gas for readjustment.
How the overpressure test works
The standard method for determining the leak rate is the overpressure test:
- A defined overpressure is established inside the chamber.
- The gas supply is shut off.
- Over a specified period, the rate at which the pressure drops is observed.
- The leak rate can be determined from the pressure drop.
In addition, suspected leak points—glove ports, airlock doors, feed-throughs, and seals—are specifically inspected for leaks.
When should testing be performed, and what helps?
- Regularly, typically as part of annual maintenance.
- If readings are rising, provided that gas purification has been ruled out as the cause.
- After a relocation or major modifications to the system.
Common sources of leaks include porous gloves and old seals. Replacing these wear-and-tear parts resolves many leaks—see “Replacing Gloves” for more information. Leak testing is an integral part of our maintenance service; you can obtain the appropriate seals and gloves from our accessories section.
Leak Testing: Frequently Asked Questions
How can I tell if my glove compartment is leaking?
Typical signs include rising O₂/H₂O levels despite a functioning gas purification system and increased gas consumption. A pressure test provides reassurance.
How often should the seal be checked?
Usually once a year as part of routine maintenance, and additionally after a move or major work on the system.
What are the most common sources of leaks?
Most commonly, porous gloves and aged seals on doors, airlocks, and feed-throughs. Replacing these wear parts resolves many leaks.
Want to have your glove box checked for leaks?
We perform pressure tests, locate leaks, and replace wear parts—regardless of the manufacturer.
Request a leak test