Stove guard using a broad field of view

A stove guard comprising:

• a data processing unit and a heat sensor arrangement for receiving heat radiation from objects located in a given field of view and for delivering detector signals indicative of the received heat radiation to the data processing unit, wherein:
• the heat sensor arrangement is arranged to generate detector signals differently corresponding to heat radiation received from a central area of the field of view than to heat radiation received from a circumferential region of the field of view,
• the heat sensor arrangement has at least a first and a second different detector elements,
• the stove guard has a first optical element and a second optical element different from said first optical element, of which said first optical element is arranged to direct heat radiation to the first detector element from a first portion of said field of view and the second optical element is arranged to direct heat radiation to the second detector element from a second portion of said field of view, of which said first portion is narrower than said second portion,
• the stove guard further comprises an optical transmitter arranged to emit optical radiation out of said stove guard so that said heat sensor arrangement is also arranged to receive from the field of view radiation emitted by said optical transmitter and reflected or scattered from an object in the field of view, and
• said data processing unit is programmed to identify whether the received radiation, emitted by the optical transmitter and reflected or scattered from an object in the field of view, changes regularly or irregularly and to interpret regular change as movement of user and irregular change as smoke or steam present in the field of view.