Tag Archives: low frequency

Internally Speaking: Applications Using the EVS-INT50W

I wrote a blog in May 2015 introducing our new EVS-INT50W internal amplifier. An overview of the product was provided along with a brief mention of applications. In this installment, I would like to discuss a few specific applications: Day Care Centers, Assembly Occupancies, K – 12 Educational Facilities, and Lodging.

evs-int50w-diagram1Day Care Centers is an ideal application for the internal amplifier because of limited wall space for mounting external hardware and the requirement for the 520Hz low frequency output. Many jurisdictions are adopting the 2012 edition of the International Building Code (IBC) which states that a manual fire alarm system that initiates the occupant notification signal utilizing an emergency voice/alarm communication system shall be installed in Group E occupancies.  Day Care facilities fall under a Group E occupancy. In addition, Section 18 of the 2013 edition of NFPA 72 states that effective January 1st, 2014, audible appliances provided for the sleeping areas to awaken occupants shall produce a low frequency alarm signal.

As defined by NFPA 101, an Assembly Occupancy is an occupancy used for a gathering of 50 or more persons for deliberation, worship, entertainment, eating, drinking, amusement, awaiting transportation, or similar uses. A common example of an assembly occupancy is a place of worship where the area of congregation will require voice evacuation. The EVS-INT50W is perfect for this application because vital wall space is saved while providing a 50 watt single speaker circuit amplifier that meets required decibel output and audibility requirements

K – 12 Educational Facilities offer the ability to use the internal amplifier with the flexibility of integrating distributed amplifiers. As with the Day Care Center application, K through 12 educational facilities fall under a Group E occupancy. Since many classrooms and other gathering locations will have an occupant load of greater than 30 people, these facilities are prime candidates for voice evacuation and emergency communications. The 5820XL-EVS and the EVS-INT50W will cover an area or areas of the facility while distributed amplifiers will cover other areas of the facility. This is quickly becoming a popular method of distributing voice.

evs-int50w-diagram2Due to recent code updates and state/local legislation, low frequency is becoming common in the lodging industry. Section 18 of the 2013 edition of NFPA 72 states that effective January 1st, 2014, audible appliances provided for the sleeping areas to awaken occupants shall produce a low frequency alarm signal. Full coverage for low frequency voice evacuation can be accomplished by using a combination of the internal amplifiers and the distributed EVS-100W amplifiers. As with the K – 12 Educational Facilities application, the 5820XL-EVS and the EVS-INT50W will cover an area or areas of the lodging facility while the distributed EVS-100W will cover other areas of the facility.

Do you have applications where the EVS-INT50W would be helpful? Please let us know by clicking on the Leave a Reply link above to enter your request.  Click here to download the EVS-INT50W data sheet.


About the Author
Mark Indgjer is a Product Marketing Manager with Silent Knight.  Mark joined Silent Knight in 1988 and is responsible for new product development, product marketing and much more.  Mark is also NICET Level II certified.​

Temporal 4 Notification Solutions

NFPA 720 has designated the Temporal 4 cadence output pattern for notification of carbon monoxide detection (CO) as the industry standard. In most cases, the annunciation of the Temporal 4 output is limited to the affected area and doesn’t require system wide notification. Silent Knight offers multiple solutions for Temporal 4 output: sounder bases, audio outputs and speaker tone.FireCO Temp 4 Detector Image

The B200S and B200S-LF sounder bases which, used in conjunction with the SK-FIRE-CO  detector, can provide the temporal 4 output for CO detection and the Temporal 3 output for fire detection where only localized annunciation is required. In addition, synchronization of the sounder bases for the Temporal 3 and Temporal 4 output can be accomplished through programming on the fire alarm control panel.

In applications where system wide annunciation of a CO alarm is required by the use of horns, Temp 4 Notification Imageyou must use either a 4-wire horn/strobe or horn only devices to achieve the Temporal 4 output. Currently, there are no 2-wire horn/strobes that can provide both the Temporal 4 for a CO alarm and Temporal 3 for fire alarm outputs. It is necessary to have a separate horn circuit that can be programmed to provide the Temporal 4 on CO alarms and Temporal 3 on fire alarms, while using a separate output to drive strobes utilizing the appropriate sync protocol. Again, synchronization of the Temporal 3 and Temporal 4 audio outputs can be programmed for the horns through the fire alarm control panel.

When using the 5820XL-EVS in applications where Temporal 4 is required for the speaker tone, a Temporal 4 or a Temporal 4 with the 520 Hz low frequency tone can be programmed for the speaker output. Synchronization cannot be accomplished through the speaker output.



About the Author
Bill Root is the Technical Support Supervisor for Silent Knight. Bill joined Silent Knight in 1988 and is responsible for managing applications and technical support across the Silent Knight product line. Bill is also NICET Level II certified.

SKST Adds the Internal Amplifier and More!

The Silent Knight Selection Tool (SKST) is a powerful program that allows you to build a system with any of our IntelliKnight addressable panels. This FREE tool provides job information, bill of materials, battery calculations, and datasheets.

SKST Version 1.4 comes with the following updates:

  • Reconciled all data sheet links for all devices. Some links have been updated to correct file SKST Image 2015not found errors, some links have been added to devices that had no links before.
  • Added the EVS-INT50W internal amplifier to the program for use with the 5820XL-EVS.
  • Added the System Sensor Low Frequency Sounders and Sounder/Strobes as well as Low-Frequency bases and accessories to the program.
  • Added the new ISO-6 multiple Isolator module to the program.
  • Added the EVS-100W Amplifier and EVS-100WBU backup amplifier to the program for use with the 5820XL-EVS Control Panel.
  • Added System Sensor WFDN series Waterflow Detectors to the program.

The SKST includes the following time-saving features and functions:

  • Enter and save project information
  • Select and edit parts from the catalog
  • Generate a bill of materials
  • Export your bill of materials to MS Excel and Microsoft Access
  • Determine battery size by creating battery calculations based on your configuration
  • Print groups of data sheets for submittal packages

To download the latest version (1.4) of SKST, please visit our website: http://www.silentknight.com/support/Pages/SKST.aspx

To learn about the SKST and other tools that Silent Knight has to offer, feel free to view our webinar “Add Value Not Cost: Free Services from Silent Knight”.



About the Author
Richard Conner is the Director of Marketing for the SED Channel – Fire-Lite Alarms, Silent Knight, and Honeywell Power. Richard joined Honeywell in 2002 and has over 15 years of experience in the fire alarm industry in Marketing, Engineering, and Product Support positions. Richard is responsible for developing brand strategy and marketing programs for all brands.

Trade Show Breakdown – After NFPA 2015

NFPA 2015 did not disappoint! Hopefully you were able to attend the expo and hit up a few of the over 120 educational tracks and sessions offered this year. The booth traffic stayed steady throughout the show and the new products got a lot of attention.

In case you missed the expo, here are a few products we highlighted this year:
Fire/CO Detector
Silent Knight’s SK-FIRE-CO addressable combination fire and carbon monoxide (CO) detector drew a lot of attention. With so many regions now requiring Fire and CO detection, the product fits tons of applications. This device not only protects people from CO leaks and fires all-in-one, but also saves the costs of independent smoke and CO detectors, and all the related parts and wiring. Plus it maintains the aesthetics of any room. It uses four sensing elements to provide the best fire detection and false signal rejection available, reducing nuisance alarms and provides a separate carbon monoxide signal. When used with the B200S/B200S-LF intelligent sounder base, the system ties together by providing the appropriate temporal signals, and because it can synchronize with System Sensor A/V devices, it becomes part of the evacuation signal vs. using a separate device.

Low Frequency Sounders, Strobes & Bases
Shown in connection with the Silent Knight fire panels were the SpectrAlert® Advance Low Frequency Sounders, Bases and Sounder Strobes. These are the first UL-listed low frequency (520 Hz) notification appliances to meet the NFPA 72® 2010/2013 requirements for new sleeping spaces. These devices were designed to easily integrate into new or existing panels’ notification appliance circuit (NAC) line and provide the required audibility and square wave tone to awaken individuals.

5820XL-EVS with Internal Amplifier (EVS-INT50W)
Ideal for schools, hospitals, government and military facilities or other places of assembly, the Silent Knight 5820XL-EVS is an excellent choice for buildings considering an emergency communication system (ECS) or fire alarm upgrade, or for those located within a municipality that will soon adopt current NFPA code ECS requirements. The EVS-INT50W is a 50 watt, single speaker circuit amplifier. What makes this amplifier unique is its ability to be mounted and housed in the 5820XL-EVS cabinet. This new amplifier mounts on the standoffs where 5815XL point expanders are normally mounted, thus saving valuable wall space.

If you’ve never attended an NFPA Conference or Expo, it’s a wealth of information for both product and industry! If your business is involved with fire, don’t miss next year’s conference at the Mandalay Bay Convention Center in Las Vegas, NV, June 13 – 16.

NFPA 2016
Did you go to NFPA 2015?  If so, what was your favorite part?

See you in 2016!

About the Author
Elizabeth Richards is the Manager of Communications for the SED Channel – Fire-Lite Alarms, Honeywell Power, and Silent Knight. Liz joined Honeywell Fire Systems in 2003 and is responsible for the communications, collateral, messaging, and events for all three brands.

You Have The Power – B200S Series Auxiliary Power Requirements

The use of sounder bases in applications such as apartments, hotels and dormitories provide a flexible and efficient means of required audible notification. The ability to activate the sounder bases in the affected area or for general alarm makes these bases an effective audible option.

The Silent Knight B200S and B200S-LF sounder bases are used with the addressable SK series of detectors. These bases require a total of 4 conductors: 2 for the SLC (Signaling Line Circuit) and 2 for constant 24 VDC auxiliary power.sounders

A distinct advantage of the B200S series sounder bases is the supervision of the constant 24 VDC auxiliary power.  Previous versions of the sounder base did not supervise 24 VDC power at the base and required an End of Line relay module along with an addressable contact input module.  If 24 VDC power was lost, the End of Line relay module would open, thus creating a trouble on the contact input module. The B200S and B200S-LF supervise the power at the base, eliminating the need for an End of Line relay module and a contact input module. Since these bases take on the address of the detector, additional addresses are not required. If the power is lost, the affected detectors will indicate a Missing Base trouble. Supervision at each base also provides huge benefits by allowing the 24 VDC power circuit to be T-Tapped or Home Run from the source. Bases that require an End of Line relay module for supervision cannot be T-Tapped or Home Run.

The Silent Knight addressable fire alarm control panel provides a standard 24 VDC constant auxiliary power option or 24 VDC constant Sounder Base Sync option. The Sounder Base Sync option outputs a sync pulse that allows all B200S and/or B200S-LF bases to synchronize when activated.

The B200S-LF is a low frequency sounder base that provides a 520 Hz output required by code for sleeping areas.

Have a question on where or when to use certain sounder bases? Have a specific question on programming? Enter questions and comments in the comments section below.

About the Author
Mark Indgjer is a Product Marketing Manager with Silent Knight.  Mark joined Silent Knight in 1988 and is responsible for new product development, product marketing and much more.  Mark is also NICET Level II certified.​