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Addressable Multi-Sensor with CO Detection

Our Most Sophisticated Multi-Sensor



Introducing Hochiki’s brand new addressable loop-powered multi-sensor, with smoke, heat and CO sensing elements. This device is unrivalled by its competitors, with 24 modes of operation, a 10 year CO cell life, and the ability to detect the threat of COHb poisoning. To help installers select the best mode for the environment Hochiki has created an interactive mode selector tool (see below).



ACD Spotlight










A  Variety of Applications


This revolutionary product offers a staggering 24 EN approved modes of operation*, including combinations of smoke detection, fixed temperature heat detection, rate of rise heat detection, CO detection and COHb toxic threat detection; making it ideal for a variety of applications.


Traditionally, CO detection is integrated into a multi-sensor to assist with the rapid detection of smouldering fires; however, the ACD-EN also features a highly sophisticated algorithm for adjusting its sensitivity according to its environment.




False Alarm Reduction


The ACD is enhanced for false alarm reduction. 


In the modes featuring the Reduced False Alarm function (+RFA), the sensor will automatically adjust the sensitivity of the optical sensing element over time, learning from its surrounding environment from the moment of installation.


It does this through a highly sophisticated algorithm which continually monitors the analogue value reading from a series of multiple samples of the environment and calculating an average value.


This ‘moving average’ value is memorised by the sensor over time to determine the environment’s baseline reading.


We call this ground-breaking algorithm ‘Suitable Moving AveRage Time’, - SMART.





Flexible Settings


Each mode utilises different fire detection technologies either in combination or individually to generate a fire condition. This allows the installer the flexibility to “fine-tune” the ACD for any environment in which it is being fitted.


Furthermore, the ACD operates on Hochiki’s world renowned, robust and reliable, ESP open protocol, giving specifiers, installers and end users an open choice on system design, installation and maintenance; and therefore complete control over costs.


Fully Approved by LPCB


EN 54-5:2000 + A1:2002

EN 54-7:2000 +A1:2002 + A2:2006

EN 54-26: 2015

EN 54-29: 2015

EN 54-30: 2015

EN 54-31: 2015

CEA 4021:2003


Panel Support


  • L@titude
  • Taktis
  • Prodex
  • FIREscape+
  • Advanced MxPro5
  • Solution F1 & F2


More coming soon!


Global Markets


Hochiki also offer a UL approved variant, the ACD-V. This version has 16 fully approved operational modes and is fully compatible with today’s enhanced FireNET Plus Control Panels and Loop Explorer II Software.


Download ACD-V Specification































































Mode Selection Tool


With 24 modes of operation* and the ability to detect smoke, heat, CO and COHb toxicity threat, the ACD-EN is unrivalled by its competitors. 
This mode selector tool has been designed to assist in the selection of the best day and night modes for the specific installation environment*.


Using your mouse (or touch screen) you can click on the outer circle of the below image to drag the mode selector tool to the chosen environment.
It is important to remember however, that this tool should be used as a guide only and it remains the responsibility of the installer to
correctly risk assess the environment and install the correct fire detection technology.




Modes Key


+S/FT/CO +RFA (Default Mode)












+FT +RoR (A1)


+FT +RoR (A1R)


+FT (A1S)


+FT +RoR (C)


+FT +RoR (CR)


+FT (CS)


+S +FT +RoR +CO +COHb




+S +COHb


+FT +RoR (A1) +COHb


+FT +RoR (A1R) +COHb


+FT (A1S) +COHb


+FT +RoR (C) +COHb


+FT +RoR (CR) +COHb


+FT (CS) +COHb


+S/H/CO +S +FT +RoR +CO/H +CO/COHb






S: Smoke | H: Heat | RoR: Rate of Rise | FT: Fixed Temperature | CO: Carbon Monoxide | COHb: Carboxyhaemoglobin | RFA: Reduced False Alarm

*This tool should be used as a guide only. It remains the responsibility of the installer to correctly risk assess the environment and install the correct fire detection equipment




See below a list of resources for the Hochiki's ACD Multi Sensor. Click on the image for more information.

ACD Multi-Sensor with CO

Hochiki's most sophisticated multi-sensor brought to market to date, with 24 EN54 approved modes of operation.

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