USON 628 Single Channel Differential Pressure Decay Leak Tester

USON 628 Single Channel  Differential Pressure Decay Leak Tester View Large Image

The 628 puts Uson’s industry leading differential pressure decay sensitivity in your hands and in your budget with no compromise in quality, reliability, and repeatability

When speed and accuracy are important to a process, Uson’s 628 Differential Pressure Decay Leak Tester is the ideal solution. Where typical differential testing methods can be complex and expensive, Uson’s 628 leak tester delivers unmatched accuracy and reliability.


With the 628, Uson has reinterpreted the classic automatic leak tester into a powerful-yet-simple instrument that can run multiple tests, including differential pressure decay, differential vacuum decay, and compensation and calibration programs.


The Uson 628 leak tester serves the automotive, industrial and medical device industries, helping to identify quality issues to increase yield and improve production efficiency. By identifying leaks early in the process, the 628 helps to reduce the likelihood of product deviations or recall issues.


As a highly flexible and budget-friendly choice in leak detection, the 628 allows users to choose from four different pressure ranges from vacuum up to 225 psi (15 bar) to cover a wide range of applications from medical check valves to automotive radiators and more.  Plus, it is possible to create and save up to 30 test programs for fast recall.



  • Offers a large, user-friendly, 4.3” TFT graphic display
  • Features a standard front challenge port for convenient connections
  • Allows for comfortable, table-top usage, with a 15° viewing angle with a small footprint and low profile (5.3” x 12.6” x 13.2”)
  • Stores up to 512 results to allow review of previous results, including individual program statistics like pass, counters, average, and min and max values
  • Includes an export/import option to backup and retrieve tester settings, and allows the transfer of these settings to other testers
  • Supports external outputs, including Pass, Reject +, Reject -, Alarm, and EOC
  • Includes pressure & vacuum options
  • Offers an electronic regulator option for testing multiple pressures
  • Includes internal or external vacuum supply options
  • Supports external inputs, including Start, Abort, and Program Selection
  • Sends readable, text-formatted reports or result audit output to a USB memory device, internal memory file, or serial port
  • Protects electronics with a dust-proof and waterproof enclosure
  • Incorporates a flat, seamless front panel for easier cleaning
  • Allows across-the-room viewing of at least 10 feet, with accentuated Pass/Fail lights
  • Reduces unintentional interference of the regulator by operators by connecting the regulator in rear of the instrument
  • Supports English, Chinese, and Spanish languages, with additional languages on request
  • Calibration Port Options: Mini Swagelok, Swagelok, Staubli


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