UO-09-628-S

Overview

The Floyd Bell Inc. UO-09-628-S is an ultra-loud piezoelectric audio warning device from the Ultra Series. It operates on a DC input voltage range of 6 to 28 VDC with a current draw of 50 mA. The unit produces a continuous tone at a center frequency of 2 kHz, specifically rated between 1750 Hz and 2250 Hz. Acoustic performance reaches 108 dBA at a distance of two feet. The housing utilizes flame-retardant Noryl thermoplastic with a 94V-0 rating.

Feature Summary

• Ultra-loud acoustic output capability for high-noise environments
• Flame-retardant Noryl thermoplastic construction ensuring safety compliance
• Internally driven piezoelectric mechanism requiring no external oscillator circuitry
• Continuous tone generation for persistent alarm signaling

Applications

• Industrial machinery safety interlocks
• HVAC system fault indication
• Commercial appliance status alerts
• Automotive or mobile equipment warning systems

Procurement Notes

Verify the specific suffix requirements against your assembly drawings. Confirm that the 6-28 VDC operating range aligns with your power supply architecture. Ensure panel mounting dimensions accommodate the 35.81 mm diameter. Check for any environmental sealing needs not covered by the standard thermoplastic housing.

Selection Notes

Select this model when high decibel output is critical for audibility over background noise. The internally driven design simplifies PCB layout by removing the need for separate driver components. Consider the 94V-0 flammability rating if the installation location requires specific fire safety certifications. Verify that the 2 kHz frequency does not conflict with other audible signals in the same enclosure.

Part Context

This component belongs to Floyd Bell's Ultra Series of piezoelectric alarms. It shares the core acoustic driver technology with models like UB-09-628-S but differs in terminal configuration and specific electrical ratings. The series is designed for panel mounting applications where reliable, high-intensity audio warnings are required without complex driving electronics.

Replacement Considerations

Direct substitutes include the UB-09-628-S(S) for similar acoustic performance with potentially different termination styles. The UC-09-628-S offers comparable specifications within the same product family. Always verify voltage tolerance and physical mounting hole patterns before swapping between these variants.