10V

Sentry 10V
Company	Sentry Siren, Inc.
Produced	1980-Present
Type	Omnidirectional Electromechanical
Sound output	115 dB @ 100 ft
Frequency	60 Hz
Horsepower	10 hp 7.5 hp (early units)
Voltage	208-230/460 V AC 1 or 3 ph
Preceded by	Sterling Model M Sterling Vertical Siren Sentry 10V2T
Documentation	Product sheet

The 10V is an omnidirectional siren that is produced by Sentry Siren, Inc. It is the second largest of Sentry's single-rotor sirens, as well as the most versatile. It is a mainstay of Sentry's lineup, having been produced for over 40 years and enjoying success in the market.

The 10V has changed little over its production run and is still produced today. While it is outperformed by its dual rotor cousins such as the 15V2T or 16V1T-B, it remains one of Sentry's more popular options.

History and design

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 is designed for both close and long-range coverage through the use of 4 long horns and 4 short horns. Originally, the 10V came stock with all long horns, and this was changed early in production. The 10V comes with these horns as standard, though it can ordered with a skirt instead of horns if desired. The horns on the 10V were originally flat at the end, but these were later replaced with pointed horns to keep snow and debris out. The 10V comes standard with an 8-port single-tone rotor and stator borrowed from the Sterling Model M. It is driven by a 10 (7.5 on early units) horsepower AC motor, with each stator port having a horn attached. While 8-port is the default option, the 10V can be ordered in 16-port single tone if desired. The siren can also be special ordered as the 10V-B, which uses a 72 V DC electric motor to allow for battery backup. Unlike the other battery backup models Sentry offers, the 10V-B is not listed as an official model and is only a special-order option.

Like all of Sentry's single-rotor sirens, the siren's design is very basic, with the rotor and stator being attached to a 6-legged mount that has a cone to project the sound from the intake outwards. The motor itself is placed inside a weatherproof housing above the siren. This simple design allows the siren to be both cheap and easy to maintain. The horns and intake use mesh screens to keep debris out. The 10V is available in either 1 or 3 ph AC, with 1 ph units using a centrifugal regenerative brake which slows the rotor down rapidly when the rotor reaches a low enough RPM to recharge the motor's capacitor. The siren can reach 115 dB at 100 ft, according to Sentry. A corrosion-resistant stainless-steel variant of the siren was also offered for areas such as coastal cities, where the salty air would otherwise destroy the siren rapidly.