Sentry Siren: Difference between revisions

	Sentry Siren, Incorporated
	; "Premium Outdoor Warning Systems"
Names	Sentry Siren, Inc The Sterling Siren Fire Alarm Corporation (formerly)
Headquarters	Penrose, CO (2020-Present) Canon City, CO (1972-2020)
Founder	Bill Yarberry Scott Yarberry
Key people	Bill Yarberry Scott Yarberry
Founded	1972
Products	Outdoor Warning Sirens
Preceded by	Sterling Siren Fire Alarm Co.
Website	sentrysiren.com

Revision as of 10:14, 8 February 2025

Sentry Siren, Incorporated, technically the successor to the Sterling Siren Fire Alarm Company, is a siren manufacturer that produces a wide range of omnidirectional sirens of many shapes, sizes, and sounds. Being little more than refreshed Sterling Model M sirens at the core, these sirens are known to be very reliable and low maintenance due to their omnidirectional design, although their designs are often inefficient.

History

Sentry Siren began in 1972, founded by Bill Yarberry. The company was run out of Canon City, Colorado, and purchased the designs and rights to the Sterling Siren Fire Alarm Company's sirens, as Sterling had fallen on hard times and had gone out of business. Several sirens were carried over, including the Model M (which was renamed to the Model M-10), the Model 2V8, and the Model F-2. The sirens remained largely the same as their original Sterling counterparts around this time. Around 1973, Sentry would introduce their first custom siren, the 10V2T. The 10V2T was little more than a Model M that was placed into a vertical configuration with horns, but proved to be more popular. As a result, the Model M would see a redesign to match the 10V2T in the mid 1970s. While the company operated as Sentry Siren at this time, the tags on the sirens were marked as "The Sterling Siren Fire Alarm Corporation" instead of Sentry Siren until around 1976.

In 1980, seeing the success of the 10V2T, Sentry would release several more sirens, which included the 3V8, 5V, 10V, and 20V2T. Early models went through several small design changes. Some notable differences include the bottom intake stand having eight legs instead of six, the cooling holes in the motor cover being placed differently, the horn extensions being larger and flat-edged, and more. These sirens would prove quite successful, and the lineup would be expanded further in the mid 1980s with the introduction of the 15V2T. The 16V1T-B was introduced in 2000.

In 2001, Sentry designed a custom built siren to match a customer's requirements, called the SS3 (Defender). This was added to the lineup as an option to compete with the growing demand of rotating sirens, however sales of their omnidirectional sirens were prioritized. Demand remained low, and the Defender was removed from the Sentry website after 2011. Their first "giant voice" array, the VR, was released in 2019, and was succeeded by the SV-8 in 2022. In 2023, Sentry discontinued the 10V2T and introduced the 10V1T.

Sentry is well known to accommodate customer needs whenever possible. They can augment existing siren designs to match specific customer requirements, as well as provide refurbishment for previous customers. The shrouds/horns on their sirens are made of galvanized steel, and the chopper/stator assembly is aluminum, with the pairs machined to match strict tolerance requirements. The shrouds and horns can be made of stainless steel upon request, allowing sales to coastal regions.

Products

Single rotor electromechanical sirens

3V8 (3V8-H, 3V8-H-B)

The 3V8 is the smallest purpose-built outdoor warning siren in Sentry's lineup, as well as the cheapest. It is their smallest siren, introduced as part of Sentry's 1980 lineup, using a rotor nearly identical to that of an original Sterling M. The rotor is also used on the 10V1T. The 3V8 is rated 109dBc at 100ft by Sentry.

In early as 1999 a variant of the 3V8 was introduced, using horns instead of a skirt. This is branded as the 3V8-H, and while it is slightly more expensive, the horns increase the siren's performance. These horns make the siren very similar in appearance to the 7V8, but shorter in height due to the 3V8's smaller rotor.

In 2015, another variant of the 3V8 was introduced, named the 3V8-H-B. The 3V8-H-B is the DC alternative to the 3V8, running on a 4HP 42vDC motor rather than a 5HP AC motor. This allows the siren to run approximately 30 minutes after power is lost. The 3V8-H-B performs identically to a standard 3V8-H.

7V8 (7V8-B)

In 2000, the 7V8 was introduced along with the 16V1T-B, replacing the 5V as Sentry's midrange siren. The 7V8 reaches the same sound output as the 5V, rated 112dBc at 100ft by Sentry, with the added horns giving additional range. In 2002, a DC-powered battery backup capable version of the 7V8 was released, called the 7V8-B. Instead of using a 7.5HP AC motor, the 7V8-B uses an 8HP 72vDC motor, which allows the siren to run on battery backup if AC power is lost. The siren is rated to run approximately 30 minutes after AC power is lost, before the batteries run out of power. It is otherwise entirely identical to the standard 7V8 in both appearance and performance. The rotor on the 7V8 is also found on the 5V, 10V, 10V2T, and M-10.

10V

The 10V was essentially 1/2 of a 10V2T, and used a 7.5HP motor until being opted with a 10HP in the late 1990s. The exact introduction date of the 10V is unknown. It was first seen in a brochure from 1980, however a unit from the late 1970's has been found. The rotor assemblies used on the 10V are also found on the 5V, 7V8, 10V2T, and M-10. Those found on the 16V1T-B and 15V2T/20V2T are the same diameter, but taller. According to Sentry, the 10V is rated 115dBc at 100ft.

14V (14V-B)

The 14V was introduced in 2015, and is essentially the bottom-half of a 40V2T, using a 15HP AC motor. It has been Sentry's top seller since its introduction, and is rated 127dBc at 100ft, according to Sentry.

The 14V is also available in DC power, called the 14V-B, which uses a 14HP 72vDC motor. The siren is rated to run approximately 30 minutes before running out of power when running on its batteries. The 14V-B is otherwise identical to the standard 14V in both performance and design, with slight differences in pitch and an added battery enclosure.

Dual rotor mechanical sirens

10V1T

The 10V1T was released in 2023, as the successor to the discontinued 10V2T. Intended to be a cheap dual rotor option for those on a budget, it is the smallest and cheapest of all of Sentry's dual rotor sirens. The first 10V1Ts were installed in late 2022, after the 10V2T was discontinued earlier the same year. However, the siren did not appear on Sentry's website (along with the SV-8) until February 2023. The Sentry 10V1T performs identically to its predecessor, outputting 120dBc at 100ft, according to Sentry. This places it directly between the 10V and the larger 15V2T in terms of performance and cost, making it a very cost effective siren. The rotors on the 10V1T are also found on the 3V8.

15V2T

The 15V2T was introduced in 1986, and was Sentry's first addition to the lineup since 1980. The 15V2T is nearly as loud as the 20V2T, while also not being quite as expensive, which makes it more appealing to customers. The siren is able to reach 124dBc at 100ft as claimed by Sentry. The rotors in the 15V2T are the same diameter as those in the 10V, but taller. They are also found in the 16V1T-B and the 20V1T/20V2T.

16V1T-B

The 16V1T-B was introduced in the year 2004, as Sentry's largest battery backup equipped siren. The 16V1T-B succeeded the 15V2T-B, which was Sentry's first DC siren, introduced in 2002 in order to compete with Federal Signal and American Signal's high-selling DC sirens. It uses two 8HP 72vDC motors, which can run on battery backup for approximately 30 minutes after AC power is lost. The siren is rated 129dBc at 100ft according to Sentry. Similar to the 10V1T, The 16V1T-B has a unique tone compared to other Sentry sirens, due to the motors running at slightly at different speeds. This gives a distinct warbling tone. The rotors on this siren are also found on the 20V2T and the 15V2T.

20V1T (20V2T)

The 20V2T was introduced as part of Sentry's 1980 lineup. The 20V1T has two 8 port rotors, and the 20V2T is dual tone with 8 and 16 port rotors. Early production 20V2T units were sold with square horns, and approximately 50 of these units were produced between 1980 and 1981. Soon after introduction, manufacture was deemed too difficult and the design was revised to use round horns. Very few of these units remain today. The rotors used on this siren are also found in the 16V1T-B and the 15V2T. The 20V1T/20V2TB is rated at 125dBc at 100ft by Sentry.

40V2T

The 40V2T holds the title as the loudest siren produced by Sentry, as well as one of the loudest omnidirectional sirens ever produced. The exact date of the 40V2T's introduction is unknown, though documentation exists as early as 1998 using the siren's current design. Quincy, IL was the launch customer. The 40V2T dethroned the 20V1T and 20V2T as Sentry's loudest siren upon its introduction, rated by Sentry at 127dBc at 100ft.

Electronic sirens

SV-8

The SV-8 is Sentry's second attempt to enter the electronic siren market. It is intended to replace the short-lived VR, which was Sentry's first electronic siren. The Sentry SV-8 was leaked by a Sentry dealer in April of 2022, with little official information being released until the siren was fully introduced in February 2023. The SV-8 is a small electronic siren that is designed as a "Giant Voice" system, prioritizing voice clarity over raw sound output. The siren is rated by Sentry with an 0.85 - 0.95 Sound Transmission Index (STI) rating. At 4000W, the SV-8 is rated between 110-116 dB at 100ft. This siren fills the gap in demand for Sentry, designed to provide mass voice notification to smaller outdoor areas and event sites.

Industrial sirens

F-2

The Model F-2 (Factory siren, version 2) is a small industrial electric siren produced by Sentry Siren, Inc, and formerly the Sterling Siren Fire Alarm Company. Intended as a small industrial or rural fire siren, these sirens are the main competitor to the Federal Signal Model A and Model L. The F-2 began as the Sterling Type F, which was later re-released as the Model F-2 in 1972, featuring a simpler overall design. The siren's specifications remained the same at 117dBc at 10ft, using the same 8-port rotor, stator, and 1/5HP AC/DC universal motor.

Discontinued Products

Single Rotor

5V

The 5V is a small omnidirectional siren that was one of Sentry's original sirens, and was produced for a period of 20 years before its discontinuation. The 5V was introduced in Sentry's 1980 lineup following the success of the earlier 10V2T. The siren was able to reach 112dBc at 100ft, according to Sentry. Due to similarities between the two, the 5V was eventually discontinued in the year 2000, with the 7V8 being favored. The rotor found in the 5V is also present on the 7V8, 10V, 10V2T, and M-10.

Dual Rotor

Model M

The Model M (later renamed M-10) was introduced in 1973, being a revised version of the original Sterling Model M siren. It was rated 115dBc at 100ft. This siren had a very similar design and appearance to the Model M, except that it used taller rotor and stator assemblies with improved machining, with the shrouds lengthened to match. Due to its inefficient and obsolete design or orientation, these sirens suffered from majorly inhibited sound propagation. The M-10 was later discontinued in the 1980s.

10V2T

The 10V2T was introduced sometime between 1973 and 1976, and was produced for nearly 50 years until its discontinuation in 2023. This siren heavily used parts from the redesigned M-10, which are also found on the 5V, 10V (of which this is half of), and 7V8. The 10V2T was able to reach 121 dBc at 100ft, as claimed by Sentry. A three signal version of this siren was available for a short time after introduction, being the 10V2T-3S, which had solenoid valves on both air intakes. This siren had a similar arrangement to most dual-rotor three-signal sirens sold at the time, and used a 10HP 1PH/3PH AC motor.

The 1PH 10V2T was discontinued in 2008, and the 3PH 10V2T was ultimately pulled from market in 2023, preceding the 10V1T.

Rotational

SS3 Defender

The SS3 Defender was introduced in 2001, designed specifically to meet a customer's requests. It eventually gained a permanent spot on the Sentry line-up, being added as an extra option for potential customers. The Defender suffered in poor sales and low customer demand, as sales of their omnidirectional sirens were prioritized. It was later removed from the lineup in 2011, however support continues. The Defender used the siren core from a 5V, driven either by an 8HP DC motor, or 7.5HP AC motor. It was rated at 127dBc at 100ft.

Electronic

VR

The VR is an electronic siren that was Sentry's very first attempt to enter the electronic siren market. Introduced in 2018, the siren was produced for a short time, later being succeeded by the SV-8. The siren was advertised for "Giant Voice", being designed to function as a public address and notification system prioritizing voice clarity over raw sound output. These were advertised by Sentry as reaching up to 120dBc at 100ft, while having an incredible speech transmission index (STI) rating of 0.91 out of 1.00. This meant that it would be able to be clearly heard and understood over a great distance, which was the siren's main selling point.

Less than a dozen VR units are known to have been sold. Life the Defender, sales of omnidirectional sirens continued to outmatch the VR, eventually leading to its discontinuation in 2019 and eventual replacement in 2023.

@@ Line 6: / Line 6: @@
 == History ==
-Sentry Siren began in 1972, founded by Scott and Bill Yarberry. The company was run out of Canon City, Colorado, and purchased the designs and rights to the Sterling Siren Fire Alarm Company's sirens, as Sterling had fallen on hard times and had gone out of business. Several sirens were carried over, including the Model M (which was renamed to the Model M-10), the Model [[Sterling Vertical Siren|2V8]], and the Model [[Sentry F-2|F-2]]. The sirens remained largely the same as their original Sterling counterparts around this time. Around 1973, Sentry would introduce their first custom siren, the [[Sentry 10V2T|10V2T.]] The 10V2T was little more than a Model M that was placed into a vertical configuration with horns, but proved to be more popular. As a result, the Model M would see a redesign to match the 10V2T in the mid 1970s. While the company operated as Sentry Siren at this time, the tags on the sirens were marked as "The Sterling Siren Fire Alarm Corporation" instead of Sentry Siren until around 1976.
+Sentry Siren began in 1972, founded by Bill Yarberry. The company was run out of Canon City, Colorado, and purchased the designs and rights to the Sterling Siren Fire Alarm Company's sirens, as Sterling had fallen on hard times and had gone out of business. Several sirens were carried over, including the Model M (which was renamed to the Model M-10), the Model [[Sterling Vertical Siren|2V8]], and the Model [[Sentry F-2|F-2]]. The sirens remained largely the same as their original Sterling counterparts around this time. Around 1973, Sentry would introduce their first custom siren, the [[Sentry 10V2T|10V2T.]] The 10V2T was little more than a Model M that was placed into a vertical configuration with horns, but proved to be more popular. As a result, the Model M would see a redesign to match the 10V2T in the mid 1970s. While the company operated as Sentry Siren at this time, the tags on the sirens were marked as "The Sterling Siren Fire Alarm Corporation" instead of Sentry Siren until around 1976.
-In 1980, seeing the success of the 10V2T, Sentry would release several more sirens, which included the 3V8, 5V, 10V, and 20V2T. The earliest known Sentry Siren models were much different from modern ones. Some notable differences include the bottom intake stand having eight legs instead of six, the cooling holes in the motor cover being placed differently, the horn extensions being larger and flat-edged, and more. These sirens would prove quite successful, and the lineup would be expanded further in the mid 1980s with the introduction of the 15V2T. Sentry's sirens proved to be reliable, and they often boasted about the superior performance of omnidirectional sirens over rotational sirens, due to their constant coverage.
+In 1980, seeing the success of the 10V2T, Sentry would release several more sirens, which included the 3V8, 5V, 10V, and [[20V1T|20V2T]]. Early models went through several small design changes. Some notable differences include the bottom intake stand having eight legs instead of six, the cooling holes in the motor cover being placed differently, the horn extensions being larger and flat-edged, and more. These sirens would prove quite successful, and the lineup would be expanded further in the mid 1980s with the introduction of the [[15V2T]]. The [[16V1T-B]] was introduced in 2000.
-Various other models would be introduced later on as the company grew, and today boasts a large number of siren models. Over the years, Sentry has branched out and made many different models. From battery-backed mechanicals to fully electronic, Sentry took a crack at just about everything. Sentry sirens are normally made out of steel, however stainless steel versions are also available upon request as they offer superior resistance to corrosion and weathering. Sentry's sirens are resold today by several different companies, including [[W.S. Darley & Co.|W.S. Darley & Co]], and Edwards Signalling.
+In 2001, Sentry designed a custom built siren to match a customer's requirements, called the [[SS3 Defender|SS3]] (Defender). This was added to the lineup as an option to compete with the growing demand of rotating sirens, however sales of their omnidirectional sirens were prioritized. Demand remained low, and the Defender was removed from the Sentry website after 2011. Their first "giant voice" array, the [[VR]], was released in 2019, and was succeeded by the [[SV-8]] in 2022. In 2023, Sentry discontinued the 10V2T and introduced the 10V1T.
-Sentry Siren continues to operate today, and their sirens are a common sight across North America. They have not been without issues, of course. Their only attempt at creating a rotational siren, the [[Sentry Defender|SS3 Defender]], proved to be a flop, and their sales of their electronic sirens have been very poor. It can be expected that Sentry will continue to stick with omnidirectional mechanical sirens, where they truly excel. However, Sentry often arbitrarily rates the decibel ratings on their sirens, with several being overinflated. DC models are often marked as being up to 9 decibels louder than their AC counterparts, despite being the same siren mechanically. Other sirens have had their decibel ratings increased for no apparent reason despite no design changes. As such, the decibel ratings on Sentry's sirens should be taken with a grain of salt, especially given they are largely vertical Sterling sirens at their core. The rotor designs Sentry uses, which are designed for the horizontal Model M, shoot most of their output through the intakes, where it is wasted. In addition, the hooked, drag-heavy directional design of the rotors mean they perform much better when running ''backwards,'' which means single ph models can never reach their full potential. When running backwards, Sentry's sirens run at a higher speed and are much louder.
+Sentry is well known to accommodate customer needs whenever possible. They can augment existing siren designs to match specific customer requirements, as well as provide refurbishment for previous customers. The shrouds/horns on their sirens are made of galvanized steel, and the chopper/stator assembly is aluminum, with the pairs machined to match strict tolerance requirements. The shrouds and horns can be made of stainless steel upon request, allowing sales to coastal regions.
 == Products ==
@@ Line 19: / Line 19: @@
 ==== [[Sentry 3V8|3V8 (3V8-H, 3V8-H-B)]] ====
-The '''3V8''' is the smallest purpose-built outdoor warning siren in Sentry's lineup, as well as the cheapest. It has been a mainstay in Sentry's catalogue since its introduction, and has seen use in many places for a wide variety of purposes. The 3V8 was introduced in 1980 as part of Sentry's 1980 lineup, which also included the 5V, 10V, and 20V2T, following the success of the earlier 10V2T. The 3V8 is the smallest of that lineup, and is intended for short range use, often by industrial sites or fire stations.
+The '''3V8''' is the smallest purpose-built outdoor warning siren in Sentry's lineup, as well as the cheapest. It is their smallest siren, introduced as part of Sentry's 1980 lineup, using a rotor nearly identical to that of an original Sterling M. The rotor is also used on the 10V1T. The 3V8 is rated '''109dBc''' at 100ft by Sentry.
-As early as 1999, a variant of the 3V8 was advertised with 8 horns attached to the stator ports instead of a skirt. This is branded as the '''3V8-H''', and while it is slightly more expensive, the horns increase the siren's performance. With the exception of the horns, the 3V8-H is identical to the standard 3V8. These horns make the siren very similar in appearance to the 7V8, but shorter in height due to the 3V8's smaller rotor. In 2015, another variant of the 3V8 was introduced, named the '''3V8-H-B'''. The 3V8-H-B is the DC alternative to the 3V8, running on a 4 hp 42 V DC motor rather than a 5 hp AC motor. This allows the siren to run on battery backup if AC power is lost, and is rated to run approximately 30 minutes after power is lost. The 3V8-H-B performs identically to a standard 3V8-H.
+In early as 1999 a variant of the 3V8 was introduced, using horns instead of a skirt. This is branded as the '''3V8-H''', and while it is slightly more expensive, the horns increase the siren's performance. These horns make the siren very similar in appearance to the 7V8, but shorter in height due to the 3V8's smaller rotor.
+In 2015, another variant of the 3V8 was introduced, named the '''3V8-H-B'''. The 3V8-H-B is the DC alternative to the 3V8, running on a 4HP 42vDC motor rather than a 5HP AC motor. This allows the siren to run approximately 30 minutes after power is lost. The 3V8-H-B performs identically to a standard 3V8-H.
 ==== [[Sentry 7V8|7V8 (7V8-B)]] ====
-The '''7V8''' is the midrange single rotor siren in Sentry's current lineup, replacing the 5V for this purpose. The 7V8 was introduced in the year 2000, alongside the 16V1T-B. The 7V8 was designed to replace the 5V, which lacked any sort of amplification for its sound, and became redundant. The 7V8 reaches the same sound output as the 5V, at 112 dB at 100 ft, but the addition of horns allows the sound to be projected further.
+In 2000, the '''7V8''' was introduced along with the 16V1T-B, replacing the 5V as Sentry's midrange siren. The 7V8 reaches the same sound output as the 5V, rated '''112dBc''' at 100ft by Sentry, with the added horns giving additional range. In 2002, a DC-powered battery backup capable version of the 7V8 was released, called the '''7V8-B'''. Instead of using a 7.5HP AC motor, the 7V8-B uses an 8HP 72vDC motor, which allows the siren to run on battery backup if AC power is lost. The siren is rated to run approximately 30 minutes after AC power is lost, before the batteries run out of power. It is otherwise entirely identical to the standard 7V8 in both appearance and performance. The rotor on the 7V8 is also found on the 5V, 10V, 10V2T, and M-10.
-In 2002, a DC-powered battery backup capable version of the 7V8 was released, designated the '''7V8-B'''. The 7V8-B uses an 8 hp 72 V DC motor instead of the 7.5 hp AC motor of the standard 7V8, which allows the siren to run on battery backup if AC power is lost. The siren is rated to run approximately 30 minutes after AC power is lost before the batteries run out of power. The 7V8-B is otherwise entirely identical to the standard 7V8 in both appearance and performance.
 ==== [[Sentry 10V|10V]] ====
-The '''10V''' is the second largest of Sentry's single rotor sirens, as well as the most versatile. It is a mainstay of Sentry's lineup. The 10V was introduced in 1980 following the success of the earlier 10V2T, alongside the rest of Sentry's 1980 lineup which included the 3V8, 5V, and 20V2T. The 10V is the second largest single rotor siren produced by Sentry after the introduction of the 14V, and at the time of its release was the largest. The 10V performs at 115 dB at 100 ft, according to Sentry.
+The '''10V''' was essentially 1/2 of a 10V2T, and used a 7.5HP motor until being opted with a 10HP in the late 1990s. The exact introduction date of the 10V is unknown. It was first seen in a brochure from 1980, however a unit from the late 1970's has been found. The rotor assemblies used on the 10V are also found on the 5V, 7V8, 10V2T, and M-10. Those found on the 16V1T-B and 15V2T/20V2T are the same diameter, but taller.  According to Sentry, the 10V is rated '''115dBc''' at 100ft.
 ==== [[Sentry 14V|14V (14V-B)]] ====
-The '''14V''' is the largest and most powerful of Sentry's single rotor sirens, being little more than a 40V2T cut in half. It is intended for longer range use than its single rotor contemporaries. The 14V is one of Sentry's newest sirens, being introduced in 2015. The 14V is essentially a Sentry 40V2T that has been cut in half, using the same 10-port single tone rotor and stator as the lower half of a 40V2T. The 14V performs at 127 dB at 100 ft, according to Sentry.
+The '''14V''' was introduced in 2015, and is essentially the bottom-half of a 40V2T, using a 15HP AC motor. It has been Sentry's top seller since its introduction, and is rated '''127dBc''' at 100ft, according to Sentry.
-The 14V is also available in DC power, in the form of the '''14V-B'''. The 14V-B makes use of a DC motor with battery backup if AC power is lost. The siren is rated to run approximately 30 minutes before running out of power when running on its batteries. The 14V-B is otherwise identical to the standard 14V in both performance and design, with the only difference being the tag, nonlinear windup, and the addition of the battery enclosure next to the controls.
+The 14V is also available in DC power, called the '''14V-B''', which uses a 14HP 72vDC motor. The siren is rated to run approximately 30 minutes before running out of power when running on its batteries. The 14V-B is otherwise identical to the standard 14V in both performance and design, with slight differences in pitch and an added battery enclosure.
 === Dual rotor mechanical sirens ===
 ==== [[Sentry 10V1T|10V1T]] ====
-The '''10V1T''' was released in 2022 as the successor to the discontinued 10V2T. Intended to be a cheap dual rotor option for those on a budget, it is the smallest and cheapest of all of Sentry's dual rotor options. The 10V1T was released in September 2022, a few months after the 10V2T was discontinued in June of the same year. However, the siren did not appear on Sentry's website (along with the SV-8) until February 2023. The Sentry 10V1T performs identically to its predecessor, outputting 120 dB at 100 ft in a 360 degree radius, at least according to Sentry's claims. This places it directly between Sentry's single rotor options such as the 7V8 and 10V and the larger dual rotor 15V2T or 16V1T-B in terms of performance and cost, making it a very cost effective siren.
+The '''10V1T''' was released in 2023, as the successor to the discontinued 10V2T. Intended to be a cheap dual rotor option for those on a budget, it is the smallest and cheapest of all of Sentry's dual rotor sirens. The first 10V1Ts were installed in late 2022, after the 10V2T was discontinued earlier the same year. However, the siren did not appear on Sentry's website (along with the SV-8) until February 2023. The Sentry 10V1T performs identically to its predecessor, outputting '''120dBc''' at 100ft, according to Sentry. This places it directly between the 10V and the larger 15V2T in terms of performance and cost, making it a very cost effective siren. The rotors on the 10V1T are also found on the 3V8.
 ==== [[Sentry 15V2T|15V2T]] ====
-The '''15V2T''' is a siren that was introduced as a stopgap between the 10V2T and 20V2T, and is a solid and popular choice for cities looking for a midrange dual rotor siren. The 15V2T was introduced in 1986 and has the distinction of being the first siren introduced by Sentry after their lineup in 1980. The 15V2T is nearly as loud as the 20V2T, while also not being quite as expensive, which makes it more appealing to customers. The 15V2T shares the same design as the 16V1T-B and 20V2T. The siren is able to reach 124 dB at 100 ft as claimed by Sentry.
+The '''15V2T''' was introduced in 1986, and was Sentry's first addition to the lineup since 1980. The 15V2T is nearly as loud as the 20V2T, while also not being quite as expensive, which makes it more appealing to customers. The siren is able to reach '''124dBc''' at 100ft as claimed by Sentry. The rotors in the 15V2T are the same diameter as those in the 10V, but taller. They are also found in the 16V1T-B and the 20V1T/20V2T.
 ==== [[Sentry 16V1T-B|16V1T-B]] ====
-The '''16V1T-B''' is a DC-powered omnidirectional siren, and Sentry's most popular DC offering. The 16V1T-B was introduced in the year 2004, as Sentry's largest battery backup equipped siren. The 16V1T-B was the end result of an experiment by Sentry to create a DC-powered siren, in order to compete with the likes of Federal Signal's [[Federal Signal 2001|2001]] and ASC's [[ASC Tempest|Tempest]] series of sirens which were outselling Sentry's AC-only offerings. This began as the dual tone, dual rotor Sentry 15V2T-B in 2002, which was refined into the 16V1T-B.
+The '''16V1T-B''' was introduced in the year 2004, as Sentry's largest battery backup equipped siren. The 16V1T-B succeeded the 15V2T-B, which was Sentry's first DC siren, introduced in 2002 in order to compete with Federal Signal and American Signal's high-selling DC sirens. It uses two 8HP 72vDC motors, which can run on battery backup for approximately 30 minutes after AC power is lost.  The siren is rated '''129dBc''' at 100ft according to Sentry. Similar to the 10V1T, The 16V1T-B has a unique tone compared to other Sentry sirens, due to the motors running at slightly at different speeds. This gives a distinct warbling tone. The rotors on this siren are also found on the 20V2T and the 15V2T.
-The 16V1T-B shares the same design as the 15V2T and 20VXT. Due to running on DC power, the siren can run on battery backup, allowing it to run for approximately 30 minutes after AC power is lost.  The siren is able to reach 129 dB at 100 ft as claimed by Sentry, though this claim is questionable as it uses the same rotors as the 15V2T and 20V2T, which have a lower claimed decibel rating. Due to the nature of DC motors, the two motors do not run at the same speed, which causes a distinctive warbling sound as the two rotor sounds clash.
 ==== [[Sentry 20V1T|20V1T (20V2T)]] ====
-The '''20VXT''' is essentially a higher horsepower variant of the 15V2T. The 20VXT is the second highest horsepower siren that Sentry currently offers, only beaten by the 40V2T. Following the success of the earlier 10V2T, the 20VXT was introduced in 1980 as the dual toned 20V2T, as part of Sentry's 1980 lineup, alongside the 3V8, 5V and 10V. The 20V2T was the loudest, largest, and most powerful offering that Sentry had upon its release. The 20VXT shares the same design as the 16V1T-B and 15V2T. The 20VXT is rated at 125 dB at 100 ft by Sentry.
+The '''20V2T''' was introduced as part of Sentry's 1980 lineup. The 20V1T has two 8 port rotors, and the 20V2T is dual tone with 8 and 16 port rotors. Early production 20V2T units were sold with square horns, and approximately 50 of these units were produced between 1980 and 1981. Soon after introduction, manufacture was deemed too difficult and the design was revised to use round horns. Very few of these units remain today. The rotors used on this siren are also found in the 16V1T-B and the 15V2T. The 20V1T/20V2TB is rated at '''125dBc''' at 100ft by Sentry.
-Early production 20V2T units used square horns, instead of round ones. These were the earliest 20VXT units produced, and were only made for a short time. Approximately 50 of these units were produced between 1980 and 1981, before it was decided that these were too difficult and expensive to produce. In 1981, the horns were changed to the round design used today. Very few of these units remain today.
 ==== [[Sentry 40V2T|40V2T]] ====
-The '''40V2T''' holds the title as the loudest siren produced by Sentry, as well as one of the loudest omnidirectional sirens ever produced, only beaten by the likes of the [[Harry O. Ricci Siren & Signal, Inc.|H.O.R.]] [[H.O.R. Super Sirex|Super Sirex]]. The exact date of the 40V2T's introduction is unknown, though documentation exists as early as 1998 using the siren's current design. The 40V2T dethroned the 20VXT as Sentry's loudest siren upon its introduction, with its own unique design The 40V2T was originally rated by Sentry at 127 dB at 100 ft, but this was changed for no apparent reason to 131 dB at 100 ft despite no design changes. Thus, it is smart to take Sentry's decibel ratings with a grain of salt.
+The '''40V2T''' holds the title as the loudest siren produced by Sentry, as well as one of the loudest omnidirectional sirens ever produced. The exact date of the 40V2T's introduction is unknown, though documentation exists as early as 1998 using the siren's current design. Quincy, IL was the launch customer. The 40V2T dethroned the 20V1T and 20V2T as Sentry's loudest siren upon its introduction, rated by Sentry at '''127dBc''' at 100ft.
 === Electronic sirens ===
 ==== [[Sentry SV-8|SV-8]] ====
-The '''SV-8''' is Sentry's second attempt to enter the electronic siren market. It is intended to replace the short-lived VR, which was Sentry's first electronic siren. The Sentry SV-8 was leaked by C and K Early Warning Systems in April 2022, with little information being released about it until the siren was released in February 2023, as Sentry's second attempt to produce an electronic siren. The SV-8 is a small electronic siren that is designed as a "Giant Voice" system, prioritizing voice clarity over raw sound output. The siren is rated by Sentry with an 0.85 - 0.95 Sound Transmission Index (STI) rating. The SV-8 is rated between 110-116 dB at 100 ft, which is rather low for the wattage the siren uses. It is likely that this siren is intended for campus use rather than as a standard public warning siren, due to its prioritization of voice clarity over sound output and overall lack of raw performance.
+The '''SV-8''' is Sentry's second attempt to enter the electronic siren market. It is intended to replace the short-lived VR, which was Sentry's first electronic siren. The Sentry SV-8 was leaked by a Sentry dealer in April of 2022, with little official information being released until the siren was fully introduced in February 2023. The SV-8 is a small electronic siren that is designed as a "Giant Voice" system, prioritizing voice clarity over raw sound output. The siren is rated by Sentry with an 0.85 - 0.95 Sound Transmission Index (STI) rating. At 4000W, the SV-8 is rated between '''110-116 dB''' at 100ft. This siren fills the gap in demand for Sentry, designed to provide mass voice notification to smaller outdoor areas and event sites.
 === Industrial sirens ===
 ==== [[Sentry F-2|F-2]] ====
-The Model '''F-2''' (Factory siren, version 2) is a small industrial electric siren produced by Sentry Siren, Inc, and formerly the Sterling Siren Fire Alarm Company. Intended as a small industrial or rural fire siren, these sirens are the main competitor to the Federal Signal [[Federal Signal Model A|Model A]] and [[Federal Signal Model L|Model L]].  The F-2 began as the Sterling '''[[Sterling Type F|Type F]]''', which was later re-released as the Model F-2 in 1972, featuring a simpler overall design. The siren's specifications remained the same at 117 dB at 10 ft, using the same 8-port rotor, stator, and 1/5 hp AC/DC universal motor.
+The Model '''F-2''' (Factory siren, version 2) is a small industrial electric siren produced by Sentry Siren, Inc, and formerly the Sterling Siren Fire Alarm Company. Intended as a small industrial or rural fire siren, these sirens are the main competitor to the Federal Signal [[Federal Signal Model A|Model A]] and [[Federal Signal Model L|Model L]].  The F-2 began as the Sterling '''[[Sterling Type F|Type F]]''', which was later re-released as the Model F-2 in 1972, featuring a simpler overall design. The siren's specifications remained the same at '''117dBc''' at 10ft, using the same 8-port rotor, stator, and 1/5HP AC/DC universal motor.
 == Discontinued Products ==
@@ Line 72: / Line 68: @@
 ==== [[Sentry 5V|5V]] ====
-The '''5V''' is a small omnidirectional siren that was one of Sentry's original sirens, and was produced for a period of 20 years before its discontinuation. The 5V was introduced in 1980 alongside Sentry's other 1980 lineup following the success of the earlier 10V2T, which included the 3V8, 10V, and 20V2T. The siren was able to reach 112 dB at 100 ft according to Sentry. The 5V was eventually discontinued in the year 2000, when Sentry's lineup began to change. The 5V and the newly introduced 7V8 had very similar production costs and performance, which led to Sentry choosing to discontinue the 5V in favour of the 7V8.
+The '''5V''' is a small omnidirectional siren that was one of Sentry's original sirens, and was produced for a period of 20 years before its discontinuation. The 5V was introduced in Sentry's 1980 lineup following the success of the earlier 10V2T. The siren was able to reach '''112dBc''' at 100ft, according to Sentry. Due to similarities between the two, the 5V was eventually discontinued in the year 2000, with the 7V8 being favored. The rotor found in the 5V is also present on the 7V8, 10V, 10V2T, and M-10.
 === Dual Rotor ===
+[[Model M|'''Model''' '''M''']]
+The Model M (later renamed M-10) was introduced in 1973, being a revised version of the original Sterling Model M siren. It was rated 115dBc at 100ft. This siren had a very similar design and appearance to the Model M, except that it used taller rotor and stator assemblies with improved machining, with the shrouds lengthened to match. Due to its inefficient and obsolete design or orientation, these sirens suffered from majorly inhibited sound propagation. The M-10 was later discontinued in the 1980s.
 ==== [[Sentry 10V2T|10V2T]] ====
-The '''10V2T''' is a dual rotor omnidirectional siren that was produced over a period of nearly 50 years. Being little more than a vertical 10 hp Sterling Model M at its core with horns attached, the 10V2T was one of Sentry's earliest original siren designs and was an attempt to improve upon the Sterling Model M, which Sentry had purchased and redesigned in 1973 after Sterling Siren Fire Alarm Company went under. The 10V2T was introduced sometime between 1973 and 1976, when Sentry still operated under the Sterling Siren Fire Alarm Corporation name. The Model M (renamed to the Model M-10 by Sentry) would later be redesigned to share common parts with the 10V2T, and many other sirens would be later introduced after the 10V2T's success, such as the 3V8, 5V, 10V and 20V2T. The 10V2T was the lowest powered dual rotor siren in Sentry's lineup, though it has now been replaced by the 3V8-based 10V1T. The siren was able to reach 120 dB at 100 ft as claimed by Sentry. The siren was available early on as a three-signal model with dampers, known as the '''10V2T-3S'''.
+The 10V2T was introduced sometime between 1973 and 1976, and was produced for nearly 50 years until its discontinuation in 2023. This siren heavily used parts from the redesigned M-10, which are also found on the 5V, 10V (of which this is half of), and 7V8. The 10V2T was able to reach '''121 dBc''' at 100ft, as claimed by Sentry. A three signal version of this siren was available for a short time after introduction, being the '''10V2T-3S''', which had solenoid valves on both air intakes. This siren had a similar arrangement to most dual-rotor three-signal sirens sold at the time, and used a 10HP 1PH/3PH AC motor.
-The 10V2T's sales dwindled over the years as its price and performance were lacking compared to Sentry's larger dual rotor sirens such as the 15V2T, 16V1T-B, and 20V2T, and the single ph offering was later discontinued, leaving it only available in three ph. This, along with increasing demand for sirens able to run on DC power, ultimately spelled the 10V2T's end. In June 2022, the 10V2T was officially discontinued, being replaced by the smaller 10V1T in September 2022 after a production life of 42 years. Though it is no longer officially produced, it is still available through special order or through Sentry's partners such as [[W.S. Darley & Co.|W.S. Darley & Co]].
+The 1PH 10V2T was discontinued in 2008, and the 3PH 10V2T was ultimately pulled from market in 2023, preceding the 10V1T.
 === Rotational ===
 ==== [[Sentry Defender|SS3 Defender]] ====
-The '''SS3 Defender''' was a short lived rotational siren that was the company's first and only foray into producing rotational sirens. These sirens were plagued with issues and poor design, and as such are very rare to find in service, and Sentry no longer produces any rotational sirens. The SS3 was originally created around 2001, and was originally called the SS3. The siren reached 127 dB at 100 ft, and came equipped with battery backup, allowing it to run up to 30 minutes after grid power is lost. Unfortunately, the Defender was plagued with issues from the beginning, and this led to the siren becoming quite unreliable. Due to its lack of popularity and its lackluster reliability compared to other DC sirens such as Federal Signal's 2001-130 and ASC's [[ASC Tempest|T-128]], as well as Sentry's overall preference for omnidirectional sirens, Sentry ultimately opted to discontinue the Defender in 2011, after a 10 year production run. This would ultimately be the only rotational siren Sentry would make, as they decided that omnidirectional sirens were the superior option.
+The '''SS3 Defender''' was introduced in 2001, designed specifically to meet a customer's requests. It eventually gained a permanent spot on the Sentry line-up, being added as an extra option for potential customers. The Defender suffered in poor sales and low customer demand, as sales of their omnidirectional sirens were prioritized. It was later removed from the lineup in 2011, however support continues. The Defender used the siren core from a 5V, driven either by an 8HP DC motor, or 7.5HP AC motor. It was rated at '''127dBc''' at 100ft.
 === Electronic ===
 ==== [[Sentry VR|VR]] ====
-The '''VR''' is an electronic siren that was Sentry's very first attempt to enter the electronic siren market. The siren was only produced for a short time as Sentry failed to establish a foothold in the market. It was later succeeded by the SV-8. The VR was announced and introduced in 2018 on Sentry's website. The siren was advertised as a Giant Voice siren, being intended to function as a public address and notification system prioritizing voice clarity over raw sound output. These were advertised by Sentry as reaching up to 120 dB at 100 ft while having an incredible speech transmission index (STI) rating of 0.91 out of 1.00. This meant that it would be able to be clearly heard and understood over a great distance, which was the siren's main selling point.
+The '''VR''' is an electronic siren that was Sentry's very first attempt to enter the electronic siren market. Introduced in 2018, the siren was produced for a short time, later being succeeded by the SV-8. The siren was advertised for "Giant Voice", being designed to function as a public address and notification system prioritizing voice clarity over raw sound output. These were advertised by Sentry as reaching up to '''120dBc''' at 100ft, while having an incredible speech transmission index (STI) rating of 0.91 out of 1.00. This meant that it would be able to be clearly heard and understood over a great distance, which was the siren's main selling point.
-The VR was a complete failure for Sentry. Due to being a niche product that was poorly marketed, less than a dozen overall units are known to have been sold. In addition, Sentry's overall preference for mechanical sirens caused their attention to be focused away from the VR. This, combined with the siren's overall performance lacking compared to competing sirens such as the [[Federal Signal Modulator|Modulator]] or [[Whelen WPS-2900|WPS-2900]], led to the siren's quiet discontinuation in 2020.
+Less than a dozen VR units are known to have been sold. Life the Defender, sales of omnidirectional sirens continued to outmatch the VR, eventually leading to its discontinuation in 2019 and eventual replacement in 2023.
 [[Category:Company pages]]
 [[Category:Sentry Siren Incorporated]]
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