Abstract: An apparatus for remotely monitoring variables comprising: one or more independently powered remote monitoring devices having means for sensing variables coupled to a microprocessor for receiving and processing variable data and means for transmitting the variable data to a control device; a control device having a means for receiving variable data from the one or more remote monitoring devices, coupled to a microprocessor for processing variable data and means for transmitting data to the one or more remote monitoring devices; the one or more remote monitoring devices being momentarily activated at programmed intervals, wherein during activation, the one or more remote monitoring devices transmit a beacon signal to the control device and/or further transmits processed variable data from the and/or a previous activation period, the one or more remote monitoring devices resuming a sleep mode after such transmission(s) and at the end of the activation period, the activation period being extendible.

Abstract: The present invention relates to an apparatus and method for remotely monitoring variables comprising; one or more independently powered remote monitoring devices having means for sensing variables coupled to a microprocessor for receiving and processing variable data and means for transmitting the variable data to a control device; a control device having a means for receiving variable data from the or each remote monitoring device, coupled to a microprocessor for processing variable data and means for transmitting data to the or each remote monitoring device; the or each remote monitoring device being momentarily activated for a period of time at programmed intervals, wherein during such momentary activation period the or each remote monitoring device transmits a beacon signal to the control device and/or further transmits up to 1 byte of any processed variable data from the and/or a previous momentary activation period, the or each remote monitoring device resuming a sleep mode after such transmission(s) a

Abstract: An electronic seal (2) is disclosed which comprises a housing (4,104) and a closure member co-operable with the housing to form a seal. The closure member may for example take the form of an elongate member (6, 106) connectable at both of its ends to the housing. The closure comprises an outer portion (8, 108) surrounding a core (10, 10A, 110). A sensor assembly (14, 16, 135, 136) is provided for sensing integrity of the core. Hence tampering with the seal can be detected. The core may be formed as a fiber optic cable (10, 10A with an integrity sensor comprising an optical source 14 and an optical detector 16.