Sensor system for monitoring characteristics of a dewar tank

A sensor system for monitoring characteristics of a dewar tank having an inner shell and an outer shell, the sensor system comprising:

• a sensor arrangement comprising a first magnetic field sensor and a first permanent magnet element;
• and
• a controller;
• wherein the first magnetic field sensor is connected to the controller;
• wherein the first magnetic field sensor is configured to be attached to the outer shell of the dewar tank;
• wherein the first permanent magnet element is configured to be attached to the inner shell or to the outer shell of the dewar tank;
• wherein the first magnetic field sensor and the first permanent magnet element, in a mounted state on the dewar tank, are configured to be located in a vicinity of each other, such that the first magnetic field sensor detects a magnetic field created by the first permanent magnet element;
• and
• wherein the controller is configured to measure, via the first magnetic field sensor, the magnetic field of the first permanent magnet element and to infer at least one characteristic of the dewar tank based on the detected magnetic field of the first permanent magnet element.