1. 1 Class I Leak Detection Systems - Highest level of monitoring and prevention of double walled tanks and pipes, according EU Standard EN 13160-2 Class I Leak Detection Systems - Highest level of monitoring and prevention of double walled tanks and pipes, according EU Standard EN 13160-2 Overpressure systems working principle… Overpressure systems working principle… www.thomas-leak-detection.com

2. 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 13160 Class I Working principle - overpressure system Pressure leak detector (e.g. THOMAS-ASF D9)

3. … 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 13160 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

4. Präsentation neuer LAG Newsletter.ppt 4 Focus on Safety, For A Clean Environment. Proven ASF Leak Detector Technology Contact Mail:info@thomas-leak-detection.com Phone:+49 (0)89 809 00 1170 Web:www.thomas-leak-detection.com Copyright – Gardner Denver Thomas GmbH, D-82178 Puchheim, 02/2014 Thomas does not warrant, guarantee or assume any obligation or liability in connection with this information.