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Term Definition
20mm Panel hole size. Size of hole needed to mount Mallory's 22mm panel mount alarms.
30mm Panel hole size. Size of panel hole needed to mount Mallory's SC, SCE, LSC, SCH, SCL, ST Series of panel alarms.
AC Abbreviation for Alternating Current.
AC/DC An alarm rated for AC/DC works on both AC or DC current.
Alarm Generic term that covers electronic audible alarms. Other common names include buzzers, audible indicators, alerts, piezo's, beepers, sirens, & indicators.
Alerts Generic term that covers electronic audible alarms. Other common names include buzzers, audible indicators, piezo's, beepers, sirens, & indicators.
Alternating Current Electric current in which the polarity alternates (i.e. follows a sinusoidal wave shape), abbreviated as AC, and measured in ampheres (amps). House hold current uses AC current.
Amperes Units of electrical current abbreviated as Amps.
Amps Abbreviation for Amperes.
Audible A "sound" whose pitch falls between 1 Hz and 20,000 Hz which is the normal range of hearing for an adult. Also known as audio.
Audio A "sound" whose pitch falls between 1 Hz and 20,000 Hz which is the normal range of hearing for an adult. Also known as audible.
A-Weighted Mathematical scale used to adjust the sound level to account for the human ear not being a perfect microphone. A sound level measurement that is made using the A-Weighted scale has units of dB(a).
Board Mount Any alarm that is intended to be used on a circuit board.
Bracket Mount Audible alarms that utilize a metal bracket to mount the alarm.
Buzzers Generic term that covers electronic audible alarms. Other common names include audible alarms, audible indicators, alerts, piezo's, beepers, sirens, & indicators.
Constant Tone A constant (or continuous) tone alarm will continously sound when voltage is applied. This is in contrast to a pulsing or beeping alarm that turns on and off when voltage is applied.
Cross Walk Series Mallory Sonalert audible alarm series designed to be used for pedestrian crosswalk applications.
cUL Registered cUL is a combined specification that covers both the UL and CSA specification under one qualification certification.
dB Abbreviation for Decibels.
dB(a) Abbreviation for Decibels using an A-Weighted scale.
DC Abbreviation for Direct Current.
Decibels Unit of measure for sound level abbreviated as dB. If an A-Weighted scale is used, the abbreviation is dB(a). The decibel scale is an arbitrary scale that ranges from the threshold of hearing (0 dB) to the threshold of pain (130 dB).
Direct Current Current that flows in only one direction, abbreviated as DC, and is measured in ampheres (amps). Batteries provide direct current.
Dual Mode- C/FP Dual Mode- Continous/Fast Pulse. An alarm that can make either a continuous tone or a fast pulse tone depending on how it is powered up.
Dual Mode- C/SP Dual Mode- Continous/Slow Pulse. An alarm that can make either a continous tone or a slow pulse tone depending on how it is powered up.
Dual Tone A Tone that alternates between two different frequencies. Also known as a warble tone or a Hi-Lo sound.
Dual Tone Alarm An audible alarm that can produce two different sounds depending on which terminals are activated. One of the sounds is a continous tone, and the other is a pulsing sound.
EAU Abbreviation for Estimated Annual Usage.
EFI Abbreviation for Electromagnetic Frequency Interference
Electromagnetic Type An electromagnetic audible alarm utilizes an electro-magnetic coil and a metal disc. When a voltage is applied to the magnetic coil, the resulting electromagnetic field causes the metal disc to physcially bend.
Electromechanical Type An older technology of audible alarm that uses a metal clapper to generate the sound. Electromechanical alarms have mostly been replaced by more efficient and reliable electronic audible alarms.
EMI Abbreviation for Electro-Magnetic Interference
ESD Electro-Static Discharge.
Euro-style Terminal Block A termination type started in Europe which is finger-proof safe.
External Drive Transducer A transducer type audible alarm that only has two external connections. The user has complete control of the AC signal that is applied to the part.
Feed Back Usually refers to the third terminal on a self-drive transducer audible alarm that provides a voltage that is 180 degrees out of phase with the input voltage signal.
Flange Mount An audible alarm that has an integrated flange with mounting holes. These parts are generally mounted using rivets or screws.
Frequency The number of peaks per second of the audible air pressure wave. Also known as sound pitch and is measured in Hertz (Hz).
Fundamental Frequency The main frequency component of an audible sound. A sound can be composed of many different frequencies (think of hitting multiple keys on a piano at the same time). For electronic audible alarms, there is typically one main fundamental sound frequency.
Harmonic Frequency(s) Audible alarms typically have one main frequency called the fundamental frequency. Often, there are much softer higher frquency components in the generated sound that are called the harmonic frequencies (which are a multiple of the fundamental frequency.
Hertz Unit of measure for sound pitch or sound frequency. One Hertz equals one cycle per second. Abbreviated as Hz.
Hi-Lo Sound A sound that changes between two different pitches. Also known as a warble sound or a Dual Tone.
Hz Abbreviation for Hertz.
Indicator An electronic audible alarm that has a built in circuitry so that the user of the alarm only needs to apply voltage to the part.
Intermittent Sound A sound that repeatedly turns on and off. A slow pulsing sound is typically less than 2 pulses per second while a fast pulsing sound is typically more than 2 pulses per second. Also known as a pulsing sound.
IP A self-certified European rating system for dust water protection.
Knurled Nut The plastic or metal nut that is threaded onto the neck of the panel mount alarm.
LED Abbreviation for Light Emitting Diode.
NEMA A self-certified U.S. rating system for water protection.
Over-Voltage Applying more voltage than the normal operating voltage range. Most Mallory Sonalert alarms are rated for 10 to 20% over-voltage protection.
Panel Mount Panel mount alarms require that a hole be cut into the panel in order for the alarm to be properly mounted. The panel hole size varies depending on the alarm series used.
PC Board Mount An audible alarm designed to be mounted onto a printed circuit board.
Piezoelectric Type A piezoelectric audible alarm utilizes a piezoelectric sounder element which consists of a metal disc that has a special ceramic material mounted on it. When voltage is applied to the piezoelectric sounder element, the sounder element physically bends.
Pitch The number of peaks per second of the air pressure wave. Also known as sound frequency and is measured in Hertz (Hz).
Pulsing Sound A sound that repeatedly turns on and off. A slow pulsing sound is typically less than 2 pulses per second while a fast pulsing sound is typically more than 2 pulses per second. Also known as an intermittent sound.
Resonant Frequency The frequency at which the transducer operates the most efficiently and produces the loudness sound level.
RFI Abbreviation for Radio Frequency Interference.
RoHS An audible alarm that is RoHS compliant meets the RoHS European Directive that requires all products sold in Europe to contain insignificant levels of 5 different materials including the metal Lead (there are applications and industries that are excepted
Sealed Typically means that the back of the audible alarm is sealed in some manner. In order to completely seal an audible alarm so that it can be put through a wash cycle, a wash label must also be used to cover the front hole opening of the audible alarm.
Self-Drive Transducer A transducer type audible alarm that has three external connections. Besides the positive and ground terminals, the third terminal connects to the feed-back portion of the sounder element.
Siren Sound An audible sound whose pitch rises up and down (i.e. a police siren).
SMT Abbreviation for Surface Mount Technology.
Snap-in Mount A panel mount alarm that is especially designed to "snap" into the panel without the need for a knurled nut.
Sonalert The brand name currently owned by Mallory Sonalert Products, Inc. that includes the very first series of electronic audible alarms introduced in the late 1960's.
Sound Level A measure of the loudness of the alarm at a given distance and voltage measured in Decibels (dB). For example, the sound level of Mallory Sonalert model # SC616N is 103 dB at 2 feet at 16 Vdc. Also known as the sound loudness or sound pressure level.
Sound Loudness A measure of the loudness of the alarm at a given distance and voltage measured in Decibels (dB). For example, the sound loudness level of Mallory Sonalert model # SC616N is 103 dB at 2 feet at 16 Vdc. Also known as the sound or sound pressure level.
Sound Pressure A measure of the loudness of the alarm at a given distance and voltage measured in Decibels (dB). For example, the sound pressure level of Mallory Sonalert model # SC616N is 103 dB at 2 feet at 16 Vdc. Also known as the sound or sound loudness level.
Sounder Diaphragm or Element The metal element of the audible alarm that physically deflects to produce the air pressure wave that is interpreted by the human ear as an audible sound. Also known as the sounder or transducer element.
Tamper-proof A panel mount audible alarm where the knurled nut used to mount the alarm goes behind the panel so that someone cannot unscrew the alarm from the front.
Telephone Ringers Piezoelectric transducer type devices that operate at lower frequencies that are typically associated with the ringer sound produced by telephones.
Terminal Block Euro-style termination type which is finger-proof safe.
Transducer Diaphragm or Element The metal element of the audible alarm that physically deflects to produce the air pressure wave that is interpreted by the human ear as an audible sound. Also known as the sounder diaphragm or element.
Transducer Type An audible alarm that consists of a sounder element mounted in a housing without any associated circuitry. The user must supply the complex AC signal at the appropriate frequency to make the transducer produce an audible sound.
UL Registered An audible alarm that is UL Registered has been qualified by UL to a specific specification. Appropriate specifications include UL464 (Safety Specification for Audible Devices) and UL50 (Water-proof Panel Spec.).
VAC Abbreviation for Voltage Alternating Current (AC Voltage)
VDC Abbreviation for Voltage Direct Current (DC Voltage)
Voltage The electrical force that causes electrical current to flow abbreviated as volts.
Volts Abbreviation for voltage.
Warble Sound A sound that changes between two different pitches. Also known as a Hi-Lo sound or Dual Tone.
Wash Label A paper or plastic material with a sticky adhesive that is put on the audible alarm to cover the front hole opening so that the part can be put through a wash cycle after the soldering operation. The wash label must be removed after the wash operation.
Mallory Sonalert Products • 4411 South High School Rd. • Indianapolis, IN 46241 • 317.612.1000