Digital Vacuum Absolute Pressure Gauge For Vacuum Resin Infusion – GDH 200

Benefits of the GDH 200

  • Performance Indicator – The only way to measure the pressure value in which a high quality infusion process takes place
  • Indicates without delay and with a resolution of 1 mbar(0.02953 inHG) if a leak has been found thus it saves time with the setup of a perfect vacuum infusion process
  • Enables a performance check of the vacuum pump

An absolute pressure gauge (barometer) works the opposite way to a conventional dial type vacuum gauge which is usually mounted on resin catch pots or vacuum pumps. The latter measures the pressure differential below the atmospheric pressure surrounding the gauge (manometer) which varies widely with changes in weather and geography. An absolute pressure gauge measures the actual pressure above the absolute zero (or perfect vacuum) of pressure. Using the absolute zero of pressure as a reference provides far more accurate measurements of vacuum levels because it is a fixed point of reference uninfluenced by environmental factors. A high-quality vacuum resin infusion process or prepreg work usually takes place in the 2mbar to 20mbar range of absolute in-bag pressure. In order to confirm that a bag has been evacuated to this degree of vacuum, the gauge used needs to be accurate in this region. This is practically impossible for conventional dial type gauges, which will experience inaccuracies of at least ±55 mbar due to changing environmental conditions and the imprecise mechanism within the gauge. It is obvious that such a vacuum gauge is not appropriate for measuring an in-bag vacuum below 20 mbar.

German Advanced Composites` mission is to provide only the best products for high quality composite applications to its customers. We have gained excellent experiences with the digital vacuum absolute pressure gauge GDH 200-14 in countless projects. It responds to pressure changes with a resolution of 1mbar down to absolute zero in an instant which does not only save time with setting up the vacuum system and finding leaks. It is also an excellent performance indicator for the quality of the vacuum resin infusion process.