Abstract: A sensor insertion and removal apparatus for inserting and/or removing a sensor into/from a chamber having at least one sensor port. The apparatus has a port collar configured to connect near to or at the sensor port of the chamber and to allow the sensor to pass through the port collar into the chamber. One or more cables or screws are attached to the sensor and utilized to insert and remove the sensor at a predefined rate into the chamber.

Abstract: A sensor insertion and removal apparatus for inserting and/or removing a sensor into/from a chamber having at least one sensor port. The apparatus has a port collar configured to connect near to or at the sensor port of the chamber and to allow the sensor to pass through the port collar into the chamber. One or more cables or screws are attached to the sensor and utilized to insert and remove the sensor at a predefined rate into the chamber.

Abstract: An apparatus for permanently or semi-permanently fitting to an underground water pipe 15,16 for detecting leaks therein, comprises a hydrophone 26 mounted to acoustically monitor water flowing along the pipe 15,16 and means 29 for analysing a parameter of the output signal of the hydrophone 26 and for generating an alarm signal, in the event that the parameter is above a maximum value or below a minimum value. The apparatus further comprises a radio transmitter for transmitting the alarm signal to a remote receiver, so as to indicate the detection of a leak. The maximum and minimum values are preferably calculated using historical data obtained from the hydrophone 26, so that the values are automatically adjusted to suit location of the apparatus. In use, a plurality of leak detection apparatus can be installed to pipes at various locations around a geographical area of supply.