1 Class I Leak Detection Systems - Highest level of monitoring and prevention of double walled tanks and pipes, according EU Standard EN Class I Leak Detection Systems - Highest level of monitoring and prevention of double walled tanks and pipes, according EU Standard EN Overpressure systems working principle… Overpressure systems working principle…

Interstitial space Pressure line Measuring line Air flow OFF ON Pump Pressure in the Interstitial Green operation light -Leak detector shows normal operation by green light Normal Operation -Interstitial space of the double walled tank (or pipe) is pressurized up to system setup „Pump OFF“ -Normal pressure variations, caused by the system or temperature changes balanced by the pump OFF ON Note: If the operating frequency of the pump increases more and more, this points to an increasing leakage. Note: If the operating frequency of the pump increases more and more, this points to an increasing leakage. Double walled tank (or pipe) Leak Detection acc. EN Class I Working principle - overpressure system Pressure leak detector (e.g. THOMAS-ASF D9)

… in the outer tank wall or Pump Pressure in the Interstitial OFF ON Air flow OFF ON Leakage in the system… -Air is pressed through the inner wall into the tank, or through the outer wall - Pressure level in the interstitial space is decreasing - At set point “Pump ON”, pump starts - Pump can‘t balance the leakage, the pressure level changes down to the set point “Alarm ON” - Alarm situation indicated by visual red light and acoustic buzzer - Switch off the buzzer, call for service Alarm buzzer switch „Buzzer disabled” indicated by yellow light Red alarm light Prevention time … in the inner tank wall Pressure leak detector (e.g. THOMAS-ASF D9) Leak Detection acc. EN Class I Working principle - overpressure system - For a certain period of time, the pressure in the interstitial remains higher than the max. hydrostatical pressure inside the tank  prevents leaking into the environment

Präsentation neuer LAG Newsletter.ppt 4 Focus on Safety, For A Clean Environment. Proven ASF Leak Detector Technology Contact Phone:+49 (0) Web: Copyright – Gardner Denver Thomas GmbH, D Puchheim, 02/2014 Thomas does not warrant, guarantee or assume any obligation or liability in connection with this information.