What is ClassiFire ® ? ClassiFire is a patented Artificial Intelligence system used in the Stratos-HSSD ® range of Aspirating Smoke Detectors. ClassiFire continually monitors the environment and automatically adjusts operating parameters to maximise sensitivity. When it has conditioned itself to the environment, it does not need manual re-adjustment.

Advantages Very simple initial set-up. Constantly monitors the environment and adjusts sensitivity to allow optimal performance at all times, irrespective of occupancy.

ClassiFire maintains sensitivity at optimum level without nuisance alarms Advantages

Alarm Indicators A user-definable ‘AUX’ level can be set to any position on the bar graph from level 2-10.

Alarm Indicators A ‘Pre-Alarm’ level is set to allow early detection of fires.

Alarm Indicators When the predetermined level of smoke is reached the ‘Fire Alarm’ is activated.

Alarm Indicators In case of large fires there is also a ‘Fire 2’ Alarm

The Stratos LCD text display can display a wide variety of messages, keeping you informed about the detector’s condition and alarm conditions. General Indicators

Number of samples in each class It builds up a statistical picture of the normal environment using histograms of smoke density... How does ClassiFire work? Smoke Level

... based on the familiar ‘normal distribution’ How does ClassiFire work? Smoke Level Number of samples in each class

How does ClassiFire work? ClassiFire ® sets the alarm flags at the appropriate distance from the histogram average level to provide the level of protection required. As the smoke distribution changes, ClassiFire ® updates the alarm levels to maintain the required level of protection.

How does ClassiFire work? When the detector is first powered up it will automatically go into ‘FastLearn’ mode while it generates a probability histogram of smoke density by sampling air from the environment. Over 24 hours, the system builds up a histogram to represent the standard range of pollution in the environment to reduce ‘nuisance’ alarms to a minimum.

The Alarm threshold flag is initially set well away from the mean to take account of the sparse data SMOKE DENSITY Amplitude of smoke signal Frequency of measurement FIRE Smoke Level

when the blue FastLearn histogram is complete, it is used as the basis for a long term histogram... SMOKE DENSITY Frequency of measurement FIRE Smoke Level Amplitude of smoke signal

the yellow slow updating histogram now takes over to form the basis for future settings SMOKE DENSITY Frequency of measurement FIRE Smoke Level Amplitude of smoke signal

As the FastLearn histogram only has 15 minutes of data, ClassiFire ® begins to perform a more refined and detailed analysis... SMOKE DENSITY Frequency of measurement FIRE Smoke Level Amplitude of smoke signal

…and after 24 hours, the detector has enough data about the working environment and sets the alarm flag based on the level of protection required... SMOKE DENSITY Frequency of measurement FIRE Smoke Level Amplitude of smoke signal

…and after 24 hours, the detector has enough data about the working environment and sets the alarm flag based on the level of protection required... SMOKE DENSITY Frequency of measurement FIRE Smoke Level Amplitude of smoke signal

…based on the normal distribution of the data. SMOKE DENSITY Frequency of measurement FIRE Smoke Level Amplitude of smoke signal

How does ClassiFire work? Smoke levels will usually be higher in daytime and lower at night. If the sensitivity is set to a fixed figure there may be unwanted alarms during the day, or delayed alarms at night: An ideal detector needs to be able to be pre-set to at least two sensitivity levels to provide the best protection. ClassiFire does this automatically

How does ClassiFire work? ClassiFire ® uses two sets of histograms; the ‘day’ and ‘night’ histograms. –The ‘day’ or ‘active’ histogram reduces sensitivity to take account of normal working practices and minimises the risk of nuisance alarms. –The ‘night’ or ‘inactive’ histogram increases sensitivity to take account of lower smoke density during night/shutdown periods and maximises protection when the protected area is unoccupied. These histograms are dynamically and continuously updated to ensure that alarm levels are optimally set.

During the day, ClassiFire ® keeps the fire alarm level out of the ‘nuisance zone’, a set distance from the active histogram average level, based on the ClassiFire ‘Alarm Factor’ selected. FIRE Number of samples in each class Smoke Density

The fast histogram updates continually in the background and is shown dotted in blue for reference. The previous ‘inactive’ histogram is maintained in the background and is shown dotted in yellow. Number of samples in each class Smoke Density FIRE

When work stops in the protected area and people leave, the smoke level starts to drop Number of samples in each class Smoke Density FIRE

The fast histogram ‘mean’ tracks the smoke level and begins to diverge from the active histogram mean, taking on new data at the rate of once per second Number of samples in each class Smoke Density FIRE

The alarm setting remains based on the ‘mean’ and the width (standard deviation) of the active histogram Number of samples in each class Smoke Density FIRE

Number of samples in each class Smoke Density FIRE

Number of samples in each class Smoke Density FIRE

As the fast histogram ‘mean’ reduces, it approaches the previous night’s histogram mean level... Number of samples in each class Smoke Density FIRE

When the Fast Histogram mean has reached at least 2/3 of the distance towards the previous night’s mean, ClassiFire ® checks to see if the time is within + 70 minutes of the programmed switchover time, and if so... Number of samples in each class Smoke Density FIRE

Number of samples in each class FIRE The inactive histogram immediately takes over and the alarm flag is repositioned based on this data. The previous active histogram is saved in the background to await the next changeover time, when the ‘search’ process is repeated. Smoke Density FIRE

How does ClassiFire work? In addition to detecting the change from ‘active’ to ‘inactive’ periods, ClassiFire ® also takes account of the time in which the change occurred. For example, if there is a change in working hours so that people leave at 6pm instead of 5pm, ClassiFire ® will adjust the changeover time by an amount proportional to the difference from the pre-set time. After a few days the system will switch over according to the new working times.

Easy to set up Set the detector’s clock and calendar. Set the Pre-Alarm and AUX alert levels if required. Set the day and night changeover times if required. Check the ClassiFire ® alarm function and set to the required level. Leave the rest to ClassiFire ® ! It’s that simple!