Flexible sheet sensor inserted in tube

A sensor for sensing moisture content of a soil medium, the sensor including:

• a tubular member;
• an electronics module;
• a flexible sheet including one or more sensing elements interfacing with the electronics module to form a sensing circuit for sensing the parameter of the soil medium surrounding the tubular member;
• and
• a shaped member;
• wherein the flexible sheet is formed around the outside of the shaped member to provide an insert which is located within the tubular member and wherein the one or more sensing elements substantially adopts the shape of an inner wall of the tubular member.

A sensing unit for sensing a parameter of a medium, the sensing unit including:

• an electronics module;
• a flexible sheet including one or more sensing elements interfacing with the electronics module to form a sensing circuit for sensing the parameter of the medium surrounding a tubular member;
• and
• a shaped member;
• wherein the flexible sheet is formable around the outside of the shaped member to provide an insert for insertion into the tubular member.

An insert for inserting into a tubular member of a sensing unit for sensing a parameter of a medium, the insert including:

• a flexible sheet including one or more sensing elements for interfacing with an electronics module to form a sensing circuit for sensing the parameter of the medium surrounding the tubular member;
• and
• a shaped member;
• wherein the insert is formed by forming the flexible sheet around the outside of the shaped member.