Category Archives: Rebecca Peterson

How Do I Meet Low Frequency Requirements Using Voice Systems? (Part 4 of 4)

In my previous blog, we talked about the products offered by System Sensor for low frequency applications, but how can you incorporate the low frequency devices using a voice system?

Most high-rise lodging applications and R-2 occupancies, such as hotels and college dormitories, require the use of voice systems to manage the evacuation of occupants. For the majority of the low frequency discussion, the product solutions in mind have been stand alone notification appliances.

What do you do when you are required to put a voice system in the sleeping space?  Can you play an audio file that can comply with the low frequency requirement?   

The answer is yes, but you have to ensure it is UL listed as compatible system to the low frequency requirements defined in UL 464.

Why is this required for fire alarm or ECS control panels since they come with a wide variety of pre-programmed sound files that do not require compatibility?

The answer can be found in the details of the low frequency requirements as defined per UL 464. Speakers are just passive devices; they just turn on or off depending on the activation of the system and operate listed frequency ranges. A sound file goes through processing as it goes through the amplifier and out of the speaker. UL requires verification that the signal coming out of the speaker complies with the low frequency performance requirements just as a standalone low frequency device.

Fire-Lite’s ECC-50/100 is now UL listed with select System Sensor Speakers and Speaker Strobes to produce the low frequency tones for Voice Evacuation or Emergency Communications. These messages can easily be downloaded to the Control panel with our Audio programming utility.

Be sure to visit the Fire-Lite Blog for the entire 4 part series and MORE!

 

About the Author
Rebecca Peterson is a Sr. Product Marketing Manager for the AV business unit of System Sensor. Rebecca has been with System Sensor for 13 years and her primary focus on new product development and voice of the customer on products that customers need and want.

 

Low Frequency Product Solutions to Meet Your Needs (Part 3 of 4)

Did you know System Sensor offers a wide variety of product solutions to meet your low frequency applications?

Low Freq Family Accessories

Low Frequency Sounders and Sounder Strobes
Like the entire SpectrAlert Advance product line, the low frequency sounder and sounder strobe devices include a variety of features that increases their application versatility while simplifying installation. Enabled with our System Sensor synchronization protocol you can interconnect them with our non-low frequency sounders to provide synchronization throughout the notification zone.

These devices were designed to easily integrate into new or existing panel’s notification appliance circuit (NAC) line and provide the required audibility and square wave tone, low frequency requirements needed to awaken individuals. They are UL listed as low frequency (520Hz) notification appliances.

The low frequency (520Hz) sounders come with three field selectable tones (T3, continuous, coded) and are compatible with 12 and 24 VDC/FWR Systems. Model Numbers are HR-LF and HW-LF.

The low frequency (520Hz) sounder strobe features our high-candela range: 135, 150,177, and 185 cd, it comes with two field selectable tones (T3 and continuous) and is compatible with 24 VDC/FWR systems. Model Numbers are P2RH-LF and P2WH-LF.

Low Frequency Sounder Bases
The B200SR-LF low frequency sounder base, with its attractive aesthetics is ideal for applications where appearance is critical. For example, the sounder base employs a separate mounting plate that installs to various junction box sizes to eliminate unsightly surface-mount boxes. In addition the mounting plate is locked in position with two retaining screws, which is covered by installed sensor head for added tamper resistance.

The low frequency (520Hz) sounder base features with field selectable tones (T3 and continuous) and is compatible with 24 VDC/FWR systems.

To learn more about System Sensor low frequency (520Hz) product solutions visit our website.

Want more? Check out part one and part two of this series.

Stay tuned for part four!


About the Author
Rebecca Peterson is a Sr. Product Marketing Manager for the AV business unit of System Sensor. Rebecca has been with System Sensor for 13 years and her primary focus on new product development and voice of the customer on products that customers need and want.

 

How Will Low Frequency Requirements Impact Me? (Part 2 of 4)

In this next blog we want to review what the low frequency requirements impact the design of the system.  (If you missed part one, click here)

Keeping people and property safe are the primary reasons we are in the life safety industry. However, when new solutions are found to protect the greater good, the impact to the design Keep In Mindmay be forgotten.

Here are a few things that you should keep in mind about designing low frequency systems:

In order for manufacturers to meet low frequency requirements, they will use speaker elements in their design. Speakers, by nature, draw more energy and are less efficient than a traditional piezo element. Don’t be surprised when you look at the datasheets and find the current draw is 2X or 3X more than the non-low frequency products. New designs require more power supplies with fewer devices on each notification circuit line.

While the lower frequency tone is more effective at waking individuals, the produced audibility is not as high as traditional notification devices. If you have higher audibility requirements or larger spaces to cover, you may find that one device will not be enough for the same area as a traditional notification device.

To learn more about the low frequency design and installation considerations visit our archived System Sensor webinar.

Be sure to check back on the Fire-Lite Blog for the next part of this series!

 

About the Author
Rebecca Peterson is a Sr. Product Marketing Manager for the AV business unit of System Sensor. Rebecca has been with System Sensor for 13 years and her primary focus on new product development and voice of the customer on products that customers need and want.

 

Why is Low Frequency So Important? (Part 1 of 4)

We’ve been trained to evacuate a building when the alarm, horns, and strobes sound during a fire event. Ideally you would respond ahearing-restoreds soon as you hear the audible device, but what happens if you’re sleeping and unable to react right away? What if you’re hard-of-hearing?

Recent studies conducted by the NFPA 72 committee and the FPRF found that many high-risk groups exhibited a delayed response when audible devices went into alarm. Some high-risk groups also had a delayed response to the usual 3 Kilo-hertz tone found in many smoke alarms and audible devices. In some cases, high-risk groups, such as individuals with mild to severe hearing loss or those under the influence of sleeping aids or alcohol, had a delayed response with the higher frequency tones.

Research shows that audible devices with a lower frequency, 520 Hz, were more effective at waking impaired individuals. These impaired individuals are the aforementioned people with mild to severe hearing loss or those under the influence of sleeping aids or alcohol. Increasing the notification effectiveness in this application increases the chances of prompt evacuation during an emergency.

To learn more about the benefit of the low frequency sounders and hear the tone, visit the System Sensor Low Frequency webpage.

Be sure to check back on the Fire-Lite Blog for the next part of this series!

 

About the Author
Rebecca Peterson is a Sr. Product Marketing Manager for the AV business unit of System Sensor. Rebecca has been with System Sensor for 13 years and her primary focus on new product development and voice of the customer on products that customers need and want.