FIELD: control systems.
SUBSTANCE: invention relates to a system for monitoring a floating roof of a tank containing a liquid, wherein system determines a local status of floating roof in spaced apart sensing element locations. In a hazardous or potentially hazardous environment, there is an on-roof subsystem including a sensing element in each sensing element location, intrinsically safe measuring circuitry coupled with sensing elements and arranged for determining said local status, intrinsically safe radio communication on-roof circuitry coupled for communicating externally of on-roof subsystem local status, an intrinsically safe power supply circuitry connected to an intrinsically safe and interchangeable energy storage unit for powering on-roof subsystem. Disclosed system further includes monitoring circuitry for receiving an indication of local status and for determining an overall monitored status of said floating and further radio communication circuitry. On-roof subsystem uses wireless power supply and communication modules.
EFFECT: invention for monitoring a floating roof of a tank containing a liquid is disclosed.
26 cl, 3 dwg
