and Q16. This turns off alarm relay driver Q16
If the detected sound is maintained for a long period,
causing alarm relay K1 to deenergize signaling a
the 0.7 second alarm signal will repeat every 4.5
detected ultrasonic sound.
seconds, until the detected sound stops. If a loss of
power is encountered, relay K1 will de-energize and
During a state of no alarm, Q16 is conducting to a
signal an alarm. When Q16 returns to a conducting
hold relay K1 in the energized position. When the
state (no detected sound) relay K1 is again energized
alarm is activated, Q16 goes into a nonconducting
and integrator discharge Q17 is driven into conduc-
state for a period of approximately 0.7 seconds.
tion causing integrator capacity C27 to discharge.
DETAIL A - RANDOM MULTIVIBRATOR PULSING OUTPUT
DETAIL B - CONTINUOUS MULTIVIBRATOR PULSE OUTPUT
Figure 6-2. Typical multivibrator/integrator relationship
processor/transceiver ultrasonic motion signal. Op
d. Band Rejection Filter Functional Description.
eration of the processor/transceiver ultrasonic mo
The band rejection filter is used only when the
tion signal emits an ultrasonic sound at a frequency
processor/receiver ultrasonic passive signal is
of 26.3 kHz which appears within the
operating in the same environment as a