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).

Abstract: A distance measurement apparatus arranged to measure the distance to an object (106) comprising a first sonic transmitter (100) arranged at a first distance (h1) from that object and a second sonic transmitter (102) arranged at a second distance (h2) from that object (100), wherein the first and second distances are different, the first (100) and second (102) transmitters being controlled by processing circuitry (108) and the first and second transmitters being arranged such that sonic pulses emitted, in use, thereby are incident upon that object (106) and the apparatus further comprising at least one sonic receiver (100) arranged to receive a plurality of reflected sonic pulses and generate an output therefrom and the processing circuitry (108) being arranged to receive the output, determine the times since the first and second pulses were emitted and generate a distance to that object from the determined times.

Abstract: A method for controlling the operation of one or more electrically-operated pumps (11, 12) to pump a liquid from a well or sump (10) which, in use, receives a substantially continuous inflow of said liquid, characterized in that the method includes the step of starting or stopping each pump in relation to the approach of a change of tariff for the electricity supplied for the operation of each said pump (11, 12).