A leak detector comprising a sensor unit including a measuring slim-tube (13b) via the lower end of which a liquid in a tank is led in/out, a measuring tube (17) connected to the upper end thereof and having a sectional area larger than that thereof, and temperature sensors (133, 134) and a heater (135)...http://www.google.de/patents/US7334455?utm_source=gb-gplus-sharePatent US7334455 - Leak detector of liquid in tank
