訂閱以下載
ACA Allertor-125

ALERTING COMMUNICATORS OF AMERICA

The Allertor 125 is a rotational, electromechanical civil defense siren that was produced by Alerting Communicators of America from 1968 until it was replaced by the similar Penetrator series in 1980. The Allertor was the direct successor to Biersach and Niedermeyer's Mobil Directo siren, with significant improvements to the design which simplified manufacturing and enhanced the siren's durability and performance versus its predecessor. Like the Mobil Directo, it is unique in that it sucks in air through the bottom intake horn, and then the sound comes out of the top horn of the projector.
In 1980, the Allertor was redesigned into the Penetrator-10 and 15, which replaced the giant projector with a simple horn and intake, which reduced costs and got rid of a lot of the Allertor's problems such as snow and ice building up inside the projector, and difficulty of installation. However, the Allertor's design offered superior performance. The Allertor was sold alongside the P-10 for a short time before it was finally discontinued, as can be seen in ACA's 1980 catalogue.

The Allertor 125 is driven by a dual sided 10HP AC motor, which drives both the rotor and the rotator, and was rated at 126db at 100ft. Rather than using all-metal construction like its predecessor, ACA used then-brand new fibreglass construction on these sirens, which greatly improved the siren's longevity and durability as it prevented corrosion and better protected the siren's internals. The siren was rotated as one large unit, with the siren's motor being connected to a gear reducer that then drove vertical shaft that operated a gear-driven or chain-driven rotator below. This design was quite reliable, as chains do not suffer from the same issues as belts do. A popular misconception is that the Allertor's chains were prone to snapping, but this is far from the truth. Allertors were and still are very reliable sirens due to their fibreglass construction. The Allertor's biggest flaw was that it was prone to water building up inside the projector drum if the drainage holes were blocked, which could freeze and result in the rotor getting stuck and burning up the motor. The ACA Howler would be introduced in 1972 in an attempt to combat this problem, and the Penetrator-10 would also later solve this problem at the cost of performance.

A three-signal Allertor was offered alongside the standard dual-signal model for a short time, using a special motor that could reverse polarity during operation, which would quickly bring the rotor to a halt, creating a "Yelp" signal. This was a short lived option, with no three-signal units known to exist today, nor were any known to have been sold. Single tone 8-port or 12-port were also options, though no single tone units were known to have been sold.

The Allertor 125 came in three different generations:
Generation 1
Generation 2
Generation 3

Port Ratios : 9/12, 10/12, 8/12, 8, 12

Motor HP : 10HP, 15HP

Production : 1968-1980

Decibel Rating
Gen 1/2 - 125db | 127db Single Tone
Gen 3 - 127db | 130db Single Tone

Type of siren
Rotating Electromechanical