American Signal Corporation

American Signal Corporation (ASC) is an outdoor warning siren and mass notification company in the United States.

After performing poorly, the company reformed as Alerting Communicators of America (ACA) in 1968, and expanded the line of warning systems they produced.

The company began as Biersach and Niedermeyer Co. in 1873 as a metal fabricating operation based in Milwaukee, Wisconsin.

The company's name changed to Alerting Communicators of America (ACA), and they began production of new models to suit the needs of individual municipalities.

In 1982, the company became the first in its industry to provide a wireless digital supervisory control and data acquisition (SCADA) system called CompuLert, with over 6,000 installations worldwide.

Over the decade, the prominent advancements the company made in its sirens' designs included battery operation, high powered Voice/Sirens, and indoor alerting systems.

Watch an Allertor in the alert and attack cycle.
Watch a Penetrator-15 in the alert and attack cycle.
Head Shot of a P-50. The small tube is the air intake. The "fluting" around the bottom of the chopper is the air exit.
A pole mounted ACA P-50 in The Colony, TX.