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Quad elements coupled with new signal processing (discriminating temperature differential information and object size information) provide high "catchability." Twin-element optical unit and signal-processing circuitry provide high-density protection areas. Unit can be adjusted from quad elements sensing to twin element sensing, resulting in double the number of sensetive zones. Includes checking test of alarm contact whenever an alarm is initiated. Includes built-in alarm memory(indicates which sensor was activated) and trouble alarm to signal unit trouble or low voltage 82' Long-range vertical curtain Wall or Ceiling mount, Separate base and sensor head. Adjustable mirror Optic QUAD with aiming LED. Pulse count & sensitivity adjustment with Slight Motion detection. N/O or N/C selectable output. Alarm contact check feature with trouble output Tamper circuit LED on/off. Alarm memory, 9.5V to 30VDC