Model B401BH-2 sounder base

- Base Diameter: 6 inches (152 mm)
- Base Height (less base and sensor): 0.75 inches (19mm)
- Weight: 0.32 lb. (145 g)
- Operating Temperature Range: 14° to 140°F (–10° to +60°C)
- Operating Humidity Range: 10% to 95%, non-condensing

Electrical Ratings
- Voltage: 17 to 32 VDC
- Standby Current: 1.0 mA maximum
- Alarm Current: 15 mA maximum
- Maximum Ripple Voltage: 10% of supply voltage
- Start-up Capacitance: 200 μF
- Horn Input Current Requirement: 600 μA maximum
- Sound Output: Greater than 90 dBa measured in anechoic room at 10 feet (3 meters), 24 volts. 85 dBa minimum measured in UL reverberant room.
- Sounder Delay Time: 0.75 to 5.7 sec.

System Sensor B401BH-2 Manual

Model B401BH-2 sounder bases is intended for use with System Sensor 400 Series plug-in sensor heads in conventional 2-wire plug-in systems. Refer to systems manuals for the maximum allowable number of units per loop. The B401BH-2 requires an external 24VDC (nominal) supply with reverse polarity capability. The connections of the external supply (terminals 1 and 2) and the initiating loop (terminals 3, 4, and 5) are isolated in the B401BH-2 to prevent electrical interaction between them.

A loop of horns can be made to sound by reversing the polarity of the external supply.

NOTE: When the associated system is NOT used as a supplementary evacuation system, the external 24VDC supply must be treated as a component of the main power supply system with the result that it falls under the requirements of NFPA 72.