Digital linear heat detector with thermal activation confirmation

A digital linear heat detector with thermal activation confirmation comprising:

• a first conductor coated with at least a layer of a negative temperature coefficient material;
• a second conductor coated with at least a layer of a non-conductive heat sensitive material;
• a monitoring circuit configured to monitor resistance along the first and second conductors;
• wherein, in response to a heat event reaching a first predefined temperature, the layer of the non-conductive temperature sensitive material melts, thereby causing the layer of negative temperature coefficient material to come into contact with the second conductor;
• and
• wherein the monitoring circuit can detect the change in resistance along the first and second conductors due to changes in resistance of the negative temperature coefficient material caused by variations in temperature.

A digital linear heat detector with thermal activation confirmation comprising:

• a first conductor coated with an inner layer of a negative temperature coefficient material and an outer layer of a non-conductive heat resistance material;
• a second conductor coated with an inner layer of a negative temperature coefficient material and an outer layer of a non-conductive heat resistance material;
• a spring conductor wrapped around the first and second conductors to maintain a substantially continuous spring pressure between the first and second conductors;
• a monitoring circuit configured to monitor resistance along the first and second conductors;
• wherein, in response to a heat event reaching a first predefined temperature, the layers of the non-conductive temperature sensitive material melts, thereby causing the layers of negative temperature coefficient material to come into contact with each other;
• and
• wherein the monitoring circuit can detect the change in resistance along the first and second conductors due to changes in resistance of the layers of negative temperature coefficient material caused by variations in temperature.

A method for operating digital linear heat detector comprising:

• monitoring resistance along a first and second conductor of the digital linear heat detector;
• detecting, in response to a non-conductive material melting due to a heat event reaching a first predefined temperature, a change in resistance caused by a layer of negative temperature coefficient material covering the first conductor coming into contact with a layer of negative temperature coefficient material covering the second conductor;
• setting, in response to the detected change in resistance, an alarm state;
• and
• detecting additional changes in resistance due to changes in resistance of the layer of negative temperature coefficient material covering the first conductor and the layer of negative temperature coefficient material covering the second conductor due to changes in temperature.