System Sensor 2020HF fixed temperature Conventional Heat Detector (78øC) belongs to System Sensor?s Vision range of detectors. Vision is a range of conventional detectors, which have been produced using the latest in manufacturing technology and supplied with an array of installer-friendly advanced features, making them ideal for small, straightforward fire detection systems. The 2020HF 78øC fixed temperature thermal detector uses a state of the art thermal elementcombined with an application specificintegrated circuit (ASIC) to provide quick and accurate detection of fires. The detector incorporates a static element and is suitable where ambient conditions normally exhibit rapid changes in temperature above 45øC e.g. boiler houses.