Abstract: An apparatus for measuring at least one of the level and the velocity of a media in a channel, the apparatus including a remote measuring device which comprises: a sensing unit having at least one sensing assembly arranged to measure at least one of the level and the velocity of the media, a two-wire interface arranged to receive power from an external power source and permit data transfer between the sensing assembly and an external control unit over the two-wire interface, an energy store for storing energy transmitted to the measurement device over the two-wire interface, a controller, and characterised in that the remote measuring device further comprises: an indicator means for providing in-situ feedback to a user on the status of the measuring device, and a switching means which is operable in response to signals from the controller to selectively connect each of the sensing unit and the indicator means to the energy store.

Abstract: A system for the detection of a rate of flow or a level of a fluid or the presence of an object, such as a PIG, in pipelines, comprising at least one detection device that includes: a sensor assembly arranged to detect the rate of flow or level of a fluid withing a section of a pipeline or the presence of a pig located along the section of pipeline where the device is located, a power store, a position determining module, a radio frequency receiver, and a radio frequency transmitter, in which the detection device has a sleep mode in which the sensor assembly is inactive and has a first power consumption and an active mode in which the sensor assembly is active and the detection device has a second, higher, power consumption when the sensor assembly of the device is actively detecting, the device in the active mode also being arranged to transmit signals from the transmitter that are indicative of the detected property of the fluid or presence of an apparatus along the section of the pipeline; and in which the

Abstract: A velocity measurement device (17) for measuring the velocity of a moving media (3) in a channel (1), the velocity measurement device (17) including a radar unit (21) having: a radar module (33) arranged to measure the velocity of the media (3) using the Doppler effect; and a two wire interface (23) to the radar unit (21) arranged to receive power from an external power source (35), and provide data transfer between the radar unit (23) and an external control unit (19).

Abstract: A velocity measurement device (17) for measuring the velocity of a moving media (3) in a channel (1), the velocity measurement device (17) including a radar unit (21) having: a radar module (33) arranged to measure the velocity of the media (3) using the Doppler effect; and a two wire interface (23) to the radar unit (21) arranged to receive power from an external power source (35), and provide data transfer between the radar unit (23) and an external control unit (19).