Loop Powered Reflective Beam Sensor

The LPB-700 and LPB-700T are Intelligent Reflector type linear optical beam smoke detectors designed to operate as a component of an intelligent fire alarm system. They operate primarily on the principle of light obscuration utilising infra-red light. Optical beam smoke detectors are particularly appropriate for protecting buildings with large open spaces such as warehouses, atriums etc.

The LPB-700 and LPB-700T detectors are combined transmitter/receiver units, which can be directly connected to an analogue addressable loop without the need for a separate local power supply (LPB-700T requires 24Vdc @ 0.5A when using the servo test feature). The Infra-Red transmitter generates a beam of light directed towards a high efficiency reflector. The reflector returns the beam to the receiver where an analysis of the received signal is made. The change in the strength of the received signal is used to determine the alarm condition.

Testing of beam detectors when positioned at height presents some interesting challenges. The LPB-700T features a unique remote test capability that fully tests both the optics and the electronics of the device. An optical filter is automatically introduced in front of the optics, attenuating the returned beam and causing the unit to go into alarm. This allows a test facility to be placed at low level, negating the requirement to gain access to the typically high level beam to perform routine testing.

• Combined transmitter and receiver unit
• Connects directly to the analogue addressable loop
• Range 10-100 metres
• 4 fixed sensitivity/threshold adjustment
• 2 automatic variable sensitivity modes
• Numerical indicators to aid beam alignment
• Fault and alarm LED indicators
• Integral horizontal and vertical beam alignment
• Drift compensation
• 3 year warranty

• Complies with EN54-12