Conventional systems are hardware-based and use analog technology. Conventional fire alarm systems are made up of zones. Multiple devices, both initiating and notification devices, make up a zone which connect to the main control panel. Conventional systems are analog in that they use electrical currents to communicate with the control panel. Initiating and notification devices are designed to dramatically increase the current in the circuit (the amount of electricity flowing through the wires) any time the environmental conditions (heat or smoke) in the area of the sensor exceed a predetermined threshold. This change in the current is communicated to the control panel to trigger the alarm.
Because a conventional system relies on individual circuits to communicate with the control panel, the information the panel can receive is limited to the number of devices it can support. The information is also limited in the sense that it only tells the panel whether a device has been activated or removed, not which device or where.
Instead of relying on changes in the electrical current running through a circuit in a conventional system, with an addressable system digital technology transfers information from the connected devices to the main control panel as binary code – combinations of ones and zeros.
The binary code starts as an analog signal created by variations in voltage within the signaling device. With an addressable device, there is a “mini-computer” that converts these variations into binary code. Depending on the device and the types of information it is designed to convey, an addressable device can transfer a wide variety of critical information to the control panel as opposed to the single triggering signal that conventional systems provide.
Because they use digital technology, addressable systems offer a much broader range in the types of information that the control panel can receive from the devices. While all addressable systems provide the location of every device on the system to the control panel, newer, “analog addressable” systems provide even more information, such as how much smoke or heat the detector is sensing. This information allows the control panel to make “intelligent” decisions such as when or when not to go into alarm mode.
The most important type of information that addressable systems transmit is exactly where the fire is occurring in a building. Because the exact location of each device in an addressable system is programmed in, firefighters know before they even arrive precisely where in the building the fire is occurring, which allows them to respond more quickly to a fire. With a conventional system, unless the area in which the system is protecting is a single room, the firefighters will have to spread out to locate the fire.
Analog Versus Digital
In today’s digital world, people often think of analog devices or systems as old fashioned or outdated technology. Conventional fire alarm systems have indeed been around a long time. Many businesses today still use them. And, while newer technologies now exist, conventional systems remain a good option in some settings.
Conventional systems are highly reliable, cost-effective, and affordable for small buildings where just one or two zones could cover the entire area. However, more and more small businesses are beginning to consider addressable systems when it comes time to replace their systems for additional benefits that the newer technology provides.
If you’re considering a new system for your business, the key to selecting the right one is to look beyond the initial costs when evaluating the lifetime value of the system. There are other costs associated with each type of system that may make one a better choice than the other. A closer look at some of the key differences between conventional and addressable systems can help you make a more informed choice when investing in a new fire alarm system.
False alarms are always an important consideration when choosing a fire alarm system. False alarms are expensive for fire departments in terms of fuel costs, wear and tear on firefighting equipment, wasted time, and the risk of collision and injury when traveling to the scene. Not surprisingly, many jurisdictions now impose fines for false alarms, which can add up quickly for a small business.
False alarms are far more common with conventional systems because the accumulation of dust and other contaminants on the sensors can send false signals to the control panel. These can be difficult to avoid with conventional systems because there is no way to know if the alarm is false until first responders have arrived and determined, after physically seeking out the detector that triggered the alarm that contamination was the culprit.
In contrast, addressable devices can send a variety of information to the control panel, including trouble signals and maintenance alerts. With addressable systems, the alarm panel monitors the sensitivity level of the smoke detectors to prevent the occurrence of false alarms. The sensitivity of the sensors in addressable devices can also be adjusted. Also, addressable devices provide “drift compensation” – the ability to distinguish between subtle changes in the level of smoke detection that occur over time due to contamination, like dust, and rapid changes resulting from a real fire.
Without a doubt, addressable systems provide a greater level of fire safety because they allow firefighters to respond more quickly and effectively by pinpointing the exact location of a fire in a building.
There are a couple of other ways that addressable systems can improve fire safety. One is that unlike conventional systems which are limited to the notification of an alarm, addressable systems can combine notification, trouble, and supervisory signals with voice messages to provide instructions or evacuation directions to occupants in the event of a fire.
The fact that addressable systems have fewer false alarms than conventional systems can also help to ensure people take every alarm seriously. When nuisance alarms become common, people begin to ignore them, which can have deadly consequences in the event of a real fire.
An addressable system is generally more reliable than a conventional system mainly due to how the different systems are wired. With a conventional system, if a device’s wire is damaged or severed, its signal and the signal of other devices down the line cannot be transmitted to the control panel.
With an addressable system, both ends of the wire connect to the control panel. Therefore, if one end becomes damaged or severed, signals can still reach the control panel through the other end of the loop. In addressable systems, a device can be removed or disabled and it will not affect the other devices in the loop.
Addressable systems provide a great deal of flexibility in comparison to conventional systems. While the number of devices either system can accommodate is determinant on the manufacturer of the alarm panels, every type of device added to a conventional system requires a new circuit.
Because they require less wire, an addressable alarm control panel can accommodate far more devices than a conventional system. They can have anywhere from one to 30 loops, commonly referred to as a signaling line circuit , each of which can monitor and control several hundred devices.
Initial Costs and Ongoing Maintenance
The equipment required for conventional systems usually comes with a much lower price tag than addressable systems, which is why conventional systems are still a popular choice for small businesses. However, it is wise to look beyond the initial costs.
Even for small buildings, the lower initial costs to purchase the equipment needed for a conventional system are often offset by higher installation costs. Remember that conventional systems require a single circuit for each zone, one which can lead to much more complex wiring than an addressable system in which all the devices are wired into a single loop. This increase in complexity not only drives up the cost of installation but also introduces a greater risk of human error.
While both types of systems require regular inspections and testing, trouble-shooting and maintenance are easier and less expensive with addressable systems. With independently wired zones in a conventional system, each device must be checked separately to find the problematic device. Addressable devices can send maintenance alerts and trouble signals to the control panel to make finding problematic devices and getting them repaired or replaced much faster.
Which is the Best Fire Alarm System for Your Business?
While it might seem obvious at this point that an addressable system offers a better, more cost-effective design, the fact is that not every business has the budget for such a system. The best advice is to contact your local Koren Fire & Security branch. We have decades of experience in working with both types of systems. Koren has NICER-certified technicians that receive continual training on all brands of fire alarm systems and stay on the cutting edge of evolving fire alarm technologies. Contact us today for help in choosing the best fire alarm system to fit your needs and budget.
What is a conventional fire alarm system
A conventional system employs one or more initiating circuits, connected to sensors (initiating devices) wired in parallel. These sensors are devised to decrease the circuits resistance when the environmental influence on any sensor exceeds a predetermined threshold. In a conventional system the information density is limited to the number of such circuits used. At times, a floor plan of the building is often placed near the main entrance with the defined zones drawn up, and LED indicating whether a particular circuit/zone has been activated. Another common method is to have the different zones listed in a column, with an LED to the left of each zone name.
The main drawback with conventional panels is that one cannot tell which device has been activated within a circuit. The fire may be in one small room, but as far as emergency responders can tell, a fire could exist anywhere within a zone. The same applies to coded panels, which nowadays are no longer made, but can be found in old systems. These, if the decision is made to keep them, are “grandfathered” in under NFPA regulations
Improvements in technology have helped drive down costs. Should your organization choose a conventional or intelligent fire alarm system? The answer is easy…it depends. It depends on the building you are looking to have the system installed in. Best utilized for smaller applications, a conventional fire alarm remains a viable fire protection solution. The main difference between conventional and intelligent fire alarm systems is that with intelligent fire alarm systems, you can pinpoint exactly which device has been activated. Conventional systems are not able to provide exact details of the event.
Conventional Fire Alarm System
Let us start with the simplest of the two systems. A conventional fire alarm system is a fire alarm system wired using a radial method (single legs of cable). These radials are wired from the main fire alarm panel and are either fire alarm zones or sounder circuits.
Fire alarm zones are the radial circuits that monitor the detectors and manual call points. These zone circuits can accommodate multiple detectors and call points on each radial circuit.
Sounder circuits are the radial circuits that control the fire alarm sounders and Visual Alarm Devices . These circuits can accommodate multiple sounders, but they are generally limited to each sounder’s power consumption, along with how much output the panel offers on each sounder circuit.