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05
Aug 2021

A Guide to MicroCurrent HVLD Technology

A Guide to MicroCurrent HVLD Technology

High Voltage Leak Detection (HVLD) of pre-filled syringes, vials, cartridges, ampoules, BFS, bottles and liquid filled pouches detects pinholes, micro-cracks, stopper/plunger leaks, non-visible leaks under crimping and many other defects. The HVLD testing procedure also guarantees the security of the product seal by finding tiny pinholes, micro fractures and screen defects that are not visible. Eventual packing defects lead to resistance differential and changes of current flow in the container and the approximate position of the fault. It is also one of the most affordable methods for testing container closure that requires little adjustments to the infrastructure. This technology is not invasive and does not require preparation of the sample. It is one of the most powerful CCI technologies for all biological and parenteral goods

E-Scan HVLD has a high-speed test cycle, produces highly reproducible results and is easy to handle. Fast changeover and easy adjustments of test parameters for various goods and applications are further advantages. Another advantage of the HVLD technique is that it can readily be moved from the laboratory offline to 100% online testing applications at high production speeds. That is an enormous benefit and makes the inspection and validation procedure globally simpler. E-Scan employs a number of electrode probes to scan a sealed container which is not conductive. Glass, plastic or poly laminate might be the container material.

Working principle of MicroCurrent HVLD technology

In non conductive or semi-conductive packing materials, HVLD works by implementing high voltage potential for electrically conductive goods. When electrical discharges between goods and device electrodes are observed, the pinholes are determined. The two container walls (high voltage side and ground side) offer complete electric resistance when the package is not leaked, and no significant current is detected by flash. If one of the container walls has a microleak or fracture, the barrier to breakup is met and the current passes. HVLD is the only technique for leak detection that requires a crack site without mass, needing just the flow of electricity via a crack. This feature sensitises HVLD to leaks that are not identified by typical leak test systems.

Applications of MicroCurrent HVLD

  • Pre-filled syringes
  • Vials
  • Cartridges
  • Ampoules
  • BFS
  • Bottles
  • Pouches

Advantages of MicroCurrent HVLD

  • High level of repeatability and precision
  • Deterministic, non-destructive, non-invasive
  • Product and environmental low voltage exposure
  • Offline and 100% online testing at high production speeds
  • Simpler inspection and validation procedure
  • Most powerful CCI technology for all parenteral and biologic products
  • Robust method and approximate 3x Signal-Noise-Ratio for a wide range of product classes and package formats
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hvld, high voltage leak detection, high voltage leak detection principle, hvld testing, cci technologies
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