Patent ID: 8502685
Filing Date: 2013-08-06
Classification: G01F,G08B

Abstract:
1. An anti-theft alarm for a liquid storage tank, said alarm comprising: a housing having means for securing the housing to the storage tank, said housing containing a motion and/or vibration sensor for detecting tampering with the liquid storage tank; an alarm means; and a control means for activating the alarm means in response to a signal from the motion/vibration sensor; wherein the control means controls the alarm means to perform a first action, to provide a relatively localized and short audible and/or visual alert, in response to a first detection of tampering by the motion/vibration sensor, the control means controlling the alarm means to perform a further action, to activate a full alarm response, in response to detection of tampering by the motion/vibration sensor one or more further times within one or more predetermined time periods, thus reducing the occurrence of false alarms and enabling the alarm means to provide a deterrent signal prior to full alarm activation.