Technical Reference
Leak-Testing Glossary
Plain-language definitions for production leak-testing, fixtures, measurement and dispensing terms.
Definitions provide orientation, not application acceptance criteria. Read the linked method material and validate the complete production system with the responsible quality and engineering teams.
Definitions
- accumulation
- A trace-gas approach that measures gas collected in a defined space over time. Accumulation leak test.
- burst test
- A test that increases pressure until a defined opening or failure condition is observed. Burst pressure leak test.
- cc/min
- Cubic centimeters per minute, a volumetric-flow expression whose conditions should be stated. Leak rate calculator & converter.
- CCI
- Container-closure integrity: the ability of a package closure system to maintain its intended barrier. Leak testing standards.
- chamber / volumetric test
- A test arrangement that encloses a part when direct internal access is unavailable. Chamber leak test.
- continuous dispensing
- Dispensing fluid as an ongoing flow rather than discrete shots. Dispensing applications.
- CV (coefficient of variation)
- A normalized measure of spread, commonly expressed as standard deviation divided by mean. Compare metering pumps.
- differential pressure decay
- A pressure-decay approach comparing a test volume with a reference volume. Differential pressure decay.
- EtherNet/IP
- An industrial Ethernet network term; confirm any product interface requirements with Zaxis. PLC & automation integration.
- false failure
- A failed result caused by the station or process rather than the product condition. Fixture design guide.
- fill time
- The programmed interval used to bring a test volume to the selected pressure. Pressure decay buyer's guide.
- fixture
- The tooling that locates, seals and connects a part for repeatable testing. Fixture design guide.
- gauge R&R
- A measurement-system study used to assess repeatability and reproducibility. Pressure decay buyer's guide.
- helium leak test
- A trace-gas test that detects helium escaping from a test boundary. Z-Charge & Z-Ion helium system.
- hydrogen forming gas
- A hydrogen-containing tracer-gas mixture used in appropriate detection applications. Trace gas leak testing.
- internal / test volume
- The connected gas volume of the part, adapters, hoses and fixture during a test. Fixture design guide.
- IP67/IP68
- Ingress-protection designations whose applicability is determined by the relevant IEC test context. IP67 / IP68 leak testing.
- leak standard / calibrated leak / master leak
- A controlled reference leak used to check or compare a measurement system. Leak standards.
- mbar·L/s
- A pressure-volume-per-time leak-rate unit. Leak rate calculator & converter.
- NEMA enclosure
- An enclosure classification reference; review the applicable designation for the installation. Z8N NEMA air leak tester.
- OPC UA
- An open industrial interoperability standard for exchanging machine, instrument and quality data between controllers and software; the Zaxis Z8 lists OPC UA among its communication options. PLC & automation integration.
- PLC I/O
- Signals used between a programmable logic controller and production equipment. PLC & automation integration.
- positive displacement
- A pumping principle that moves a defined volume by mechanical displacement. Precision metering pumps.
- pressure decay
- A test that pressurizes a sealed volume, isolates the source and measures pressure change over time. Pressure decay leak test.
- repeatability vs accuracy
- Repeatability is result consistency; accuracy is closeness to a reference value. Compare air leak testers.
- resolution
- The smallest change an instrument can distinguish under stated conditions. Compare air leak testers.
- shot dispensing
- Dispensing a defined discrete amount in an individual cycle. Dispensing applications.
- sniffing
- A trace-gas technique that samples around accessible areas to locate escaping gas. Sniff leak test.
- stabilization / settle time
- Time after fill or evacuation that allows the part and gas condition to settle before measurement. Pressure decay buyer's guide.
- standard cubic centimeters per minute
- A gas-flow or leak-rate unit stated at defined standard conditions. Leak rate calculator & converter.
- test time
- The programmed interval during which the measurement decision is made. Pressure decay buyer's guide.
- trace gas
- An identifiable gas used by a dedicated detection method. Trace gas leak testing.
- vacuum decay
- A test that applies vacuum and observes pressure change during the measurement interval. Vacuum decay leak test.
- valveless metering pump
- A positive-displacement pump architecture that meters fluid without conventional check valves. Precision metering pumps.
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See the standards resource center, method chooser and pressure-decay buyer’s guide for deeper context.
