System Sensor B200SR-LF Intelligent Low Frequency Sounder Base

The System Sensor B200SR-LF low-frequency sounder base is designed to meet the NFPA 72 sleeping space requirement to produce a fundamental frequency of 520 Hz +/– 10% with a square wave or its equivalent. Studies show that a lower frequency, centered around 520 Hz, is the most ideal to awaken sleeping occupants, even those with mild to severe hearing loss.

The sounder base “listens in” to the communication between the attached sensor head and the fire alarm control panel (FACP) to adopt the same address as the detector, but as a unique device type on the loop. The FACP can then use that address to command an individual sounder, or a group of sounders — to activate. The command set from the panel can be tailor to the specific event, allowing the selection of volume, tone, and group. In addition, some FACPs will enable custom tone patterns.

The B200SR series is fully compatible with existing B501BH-Series sounder base installations. The device enables users to select one of two B501-supported tones (ANSI Temporal 3 or Continuous) by removing a jumper.

With its attractive aesthetics, the System Sensor B200SR-LF is ideal for applications where appearance is critical. For example, the sounder base employs a separate mounting plate that installs on various junction box sizes to eliminate unsightly surface-mount boxes. In addition, the mounting plate enables pre-wiring of all connections to speed and simplify installation. The housing then mates with the mounting plate and is locked in position with two retaining screws which are covered by the installed sensor head for added tamper resistance.

Features / Specifications

• Tone selection via an onboard jumper
• Pre-wire mounting plate fits various junction box sizes
• Mechanical locking feature prevents removal of attached sensor head
• 520 Hz +/– 10% square wave tone
• Operating Humidity Range:  10% to 93% relative humidity (non-condensing)