Abstract: A system comprising: a reservoir (14) for holding a liquid; a pump (20) arranged to pump the liquid out of the reservoir (14) or into the reservoir (14); a level sensor (26) configured to detect the level of the liquid in the reservoir (14) and to generate level data; a current monitor (28) configured to monitor the current drawn by the pump (20) and to generate current data; and a controller (30) configured to: receive level data and determine the static head from the level data, and generate head data from the static head; receive first current and head data corresponding to the current drawn by the pump (20) as a function of the static head for a first period of operation of the pump (20); receive second current and head data corresponding to the current drawn by the pump (20) as a function of the static head for a second period of operation of the pump (20), wherein the second current and head data is recorded when the liquid in the reservoir (14) is between a first liquid level and a second liquid level,

Abstract: A system comprising: a reservoir (14) for holding a liquid (1); a pump (20) arranged to pump the liquid (1) out of the reservoir (14) to a system outlet (24) or into the reservoir (14) from a system inlet; a pressure sensor (34) arranged between the reservoir (14) and the system outlet (24) or between the system inlet and the reservoir (14), the pressure sensor (34) configured to measure the discharge pressure (Pd) of the pump (20) and to generate discharge pressure data; a level sensor (26) configured to detect the level (1) of the liquid (1) in the reservoir (14) and to generate level data; a power monitor (28) configured to monitor the power consumed (p) by the pump (20) and to generate power data; a volume monitor configured to monitor the volume (V) of liquid (1) pumped by the pump (20) and to generate volume data; and a controller (30) configured to: receive the power data, the volume data, the discharge pressure data and the level data; process the discharge pressure data to determine a discharge head

Abstract: A system comprising: a reservoir (14) for holding a liquid (1); a pump (20) arranged to pump the liquid (1) out of the reservoir (14) to a system outlet (24) or into the reservoir (14) from a system inlet; a pressure sensor (34) arranged between the reservoir (14) and the system outlet (24) or between the system inlet and the reservoir (14), the pressure sensor (34) configured to measure the discharge pressure (Pd) of the pump (20) and to generate discharge pressure data; a level sensor (26) configured to detect the level (1) of the liquid (1) in the reservoir (14) and to generate level data; a power monitor (28) configured to monitor the power consumed (p) by the pump (20) and to generate power data; a volume monitor configured to monitor the volume (V) of liquid (1) pumped by the pump (20) and to generate volume data; and a controller (30) configured to: receive the power data, the volume data, the discharge pressure data and the level data; process the discharge pressure data to determine a discharge head

Abstract: A system comprising: a reservoir (14) for holding a liquid; a pump (20) arranged to pump the liquid out of the reservoir (14) or into the reservoir (14); a level sensor (26) configured to detect the level of the liquid in the reservoir (14) and to generate level data; a current monitor (28) configured to monitor the current drawn by the pump (20) and to generate current data; and a controller (30) configured to: receive level data and determine the static head from the level data, and generate head data from the static head; receive first current and head data corresponding to the current drawn by the pump (20) as a function of the static head for a first period of operation of the pump (20); receive second current and head data corresponding to the current drawn by the pump (20) as a function of the static head for a second period of operation of the pump (20), wherein the second current and head data is recorded when the liquid in the reservoir (14) is between a first liquid level and a second liquid level,

Abstract: A method of monitoring one or more sumps in order to predict an overflow condition comprising: pumping, using at least one pump (14), liquid from the or each sump (16); monitoring the liquid level in the or each sump (16) using a level monitoring means (24) and outputting liquid level data; monitoring at least one operating condition of the or each pump (16) and outputting pump condition data; and processing the liquid level and pump condition data, using processing means, to predict whether the sump will overflow within a predetermined future period.

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).

Abstract: A transducer assembly adapted for the pulse-emission of a signal includes a transducer (10) with a drive-circuit (20) therefor. The drive circuit (20) includes a charge-storage device (21), a wound-coil device (23) and one or more switching-elements (24, 25). The assembly can be used to determine the level of a fluid in an enclosed vessel.