70A-2

Overview

The Omega 70A-2 is a solid-state audible alarm annunciator designed for panel mounting. It operates on a 120 Vac supply and utilizes an internally driven piezoelectric transducer to produce a fast pulse tone. The device generates a sound level of 95 dB at a frequency of 2.9 kHz. It features screw terminals for electrical connection and is rated to withstand surge voltage up to 20% over the maximum rated voltage. This component is part of the Series 70A line, intended for use with controllers having relay outputs.

Feature Summary

• Internally driven piezoelectric sound production
• Fast pulse tone configuration
• Panel mount installation with screw terminals

Applications

• Audible temperature alarms with controller relay outputs
• Industrial control panel monitoring
• Process safety warning systems

Procurement Notes

Verify that the application requires a 120 Vac supply, as this specific model differs from variants rated for other voltages such as 220 Vac. Confirm that the required sound output matches the 95 dB specification at 2.9 kHz. Ensure the enclosure allows for panel mounting and that the wiring method supports screw terminal connections. Check for compatibility with the existing relay output drivers in the control system.

Selection Notes

Select this model when a fast pulse tone is specifically required for alarm indication. Consider the 120 Vac operating requirement against available power sources. Evaluate the 95 dB acoustic output against ambient noise levels to ensure audibility. Compare physical dimensions and mounting requirements against the available panel space. Review the surge voltage tolerance if the environment experiences electrical transients.

Part Context

The 70A-2 belongs to the Omega Series 70A family of low-cost audible alarm annunciators. These devices are engineered for solid-state sound production using piezoelectric technology. The series includes various voltage ratings and configurations, with the 70A-2 specifically designated for 120 Vac applications. It serves as a direct interface between relay outputs and audible warnings.

Replacement Considerations

Direct substitutes include the 70A-3 for similar specifications within the same series. Verify voltage compatibility when considering alternatives, as models like the 70A-1-220V operate at different potentials. Ensure any replacement maintains the fast pulse tone characteristic and 95 dB output level.