ACB-EW Hochiki Weatherproof Heat Sensor, Analogue ASX RangeManufactured by Hochiki, this Hochiki ACB EW Hochiki Weatherproof Heat Sensor, Analogue ASX Range is fully compatible with Hochiki's ESP Analogue Addressable Protocol. The ACB EW incorporates a Variable Temperature heat element and Rate of Rise heat element, both of which are controlled from the control panel, allowing either thermal element or both elements simultaneously to be active in making the fire decision. The sensor's polling LED's can also