The Hochiki ACD delivers 24 EN-approved modes of operation, combining optical smoke, heat, CO, and COHb detection in a single addressable device for accurate, reliable fire detection across a broad range of building environments.
The award-winning ACD Multi-Sensor monitors smoke and heat alongside carbon monoxide and its 24 EN-approved modes allow each detector to be set for the space it protects, from open-plan offices to kitchens and plant rooms. A smart algorithm helps it distinguish everyday conditions from a real fire, reducing unwanted alarms.
The ACD is LPCB approved to EN 54 Parts 5, 7, 26, 29, 30 and 31, and won an award at Intersec 2026.
For specifiers and installers, that means a detector tested to the multi-sensor standards with ESP open protocol compatibility. For facilities managers, it means fewer unplanned evacuations and less disruption for the people in your building.
The ACD multi-sensor offers 24 EN-approved modes of operation, combining optical, heat and CO sensing in different ways, so the detector can be matched to the risk profile of each area.
By combining optical smoke, heat and carbon monoxide sensing in one device, the ACD multi-sensor responds to a broader range of fire types than a single-technology detector.
The ACD features a high performance smoke chamber that can be removed from the detector head, making routine maintenance far simpler.
Twin LEDs on the detector head provide clear status indication from any direction. The LEDs show green when the detector is polling normally and turn red when a fire is detected
The ACD multi-sensor supports variable sensitivity, allowing the detector’s response threshold to be adjusted to suit the environment it protects.
The built-in SMART algorithm continuously analyses the signals from the detector’s optical, heat and CO sensing elements, adjusting its responsiveness based on the environment around it, to reduce false alarms.
Each ACD detector is electronically addressed, so its address is set using the control panel or programming tool rather than by physical switches or dials on the device, speeding up installation and commissioning.
The ACD multi-sensor is approved by LPCB to EN 54 Parts 5 (heat), 7 (smoke), 26 (carbon monoxide) and the multi-sensor standards 29, 30 and 31, which cover the combinations of smoke, heat and CO sensing.
The ACD is available in white or ivory, so the detector can blend in with the surrounding décor in a wide range of building types. Both colour options offer the same performance and specification.
The ACD multi-sensor carries comprehensive LPCB approvals across EN 54-5, EN 54-7, EN 54-26, EN 54-29, EN 54-30, EN 54-31, and CEA 4021:2003, providing specifiers and building managers with the assurance of independently verified performance and regulatory compliance.
From our standpoint here at Hochiki, we believe true multi-sensors should be able to demonstrate this intelligent, multiple criteria monitoring capability by being designed with these new published standards in mind from the outset.
So our advice at this point is to check the manufacturer’s LPCB certificates – freely available on the LPCB’s own reference site “Red Book Live” to check a multi-sensor’s technical credentials.
In the example certificates below, on the left, not a "True" Multi-Sensor, as smoke and heat elements have been tested independently (Part 5 and Part 7). Whereas on the right, Hochiki's ACD Multi-Sensor with CO Approval Certificate shows it has been tested with smoke, heat and CO elements working together.
