User's Manual

DUO 240
Ceiling-Mount Dual Technology Intrusion Detector
Installation Instructions
1. INTRODUCTION
DUO 240 is a microcomputer-controlled, ceiling-mounted dual-
technology intrusion detector. Its operation is based on two
physical phenomena - the infrared (IR) radiation emitted by the
human body and the Doppler frequency shift caused by a person
moving in a microwave (MW) field. The IR and MW technologies,
when combined in a single detector, complement each other to
assure the most reliable detection and immunity to false alarms.
The superiority of the DUO 240 over other dual detectors has
been achieved by the advent of a True Motion Recognition™
algorithm (patented). This advanced motion analysis method
provides the DUO 240 with the ability to distinguish between the
true motion of a human body and any other disturbances which
invariably cause false alarms.
Another unique feature of the DUO 240 is the MW Motion
Simulator circuit (patents applied for), which simulates the effect
created by a human body moving in the MW field. The simulation
routine is carried out periodically for self-testing, supervision and
assurance that the MW detector operates properly.
2. SPECIFICATIONS
Input Voltage: 9 to 16 VDC
Current Drain: About 30 mA @ 12 VDC
PIR SECTION
Detector: Low noise dual-element pyroelectric sensor
Trip Indication: Green LED flashes for up to 5 seconds
True Motion Event Verification Counter: 1 or 2 events
Detection Pattern: A virtually conical pattern of maximum 9 m
(30 ft) diameter, when installed on a 4.5 m (15 ft) ceiling (Fig. 1).
Mounting on a lower ceiling will reduce the coverage area.
MW SECTION
Oscillator: Microstrip DRO-stabilized type
Frequency: 2.45 GHz
Detection Range: Adjustable from 25% to 100%
Trip Indication: Green LED lights for up to 5 seconds
ALARM, TAMPER & TROUBLE DATA
Alarm Indication: Red LED lights for 2-3 s (both detectors trip)
Relay Contacts: Normally closed, 0.1 A resistive/30 VDC; 18 Ω
resistor in series with contacts
Alarm Duration: 2-3 seconds (red LED lights and output relay
contacts open)
Tamper Contacts: Normally closed, 50 mA resistive/ 30 VDC
Trouble Output: Open-collector, 100 mA max., with 47 Ω resistor
in series
MOUNTING AND PHYSICAL DATA
Maximum Mounting Height: 4.5 m (15 ft)
Dimensions (H x Ø): 24 x 86 mm (3.4 x 0.95 in.)
Weight: 64 g (2 oz)
Color: White
Figure 1. DUO 240 Coverage Pattern
ENVIRONMENTAL CONDITIONS
Operating Temperature: –10°C to 50°C (14°F to 122°F)
Storage Temperature: –20°C to 60°C (–4°F to 140°F)
RFI Protection: Greater than 30 V/m (20 to 1000 MHz)
PATENTS
U.S. Patents 5,237,330 and 5,693,943 (other patents pending)
Compliance with standards: EN 50131-1 Grade 2 Class II
ATTENTION! Detection occurs only in areas in which the MW and PIR patterns overlap.
3.INSTALLATION
3.1 General Guidelines
A few important rules must be observed before selecting a
mounting location.
•
Microwave radiation passes through glass and nonmetallic
walls and floors. Be sure to adjust the MW range to the
necessary minimum, to reduce the possibility of interference
from lower floors.
•
Large reflecting objects (especially metals) within the
coverage area can distort the microwave detector's coverage
pattern.
•
Although the DUO 240 is extremely immune to air turbulence
and RF interference, avoid installation in a room with very
strong air drafts or close to high-power electrical cables. It is
also recommended to avoid aiming the detection pattern at
sources of bright light and/or heat.
•
If two DUO 240 units are installed in the same room, they
should be mounted at least 2 m (6 ft) apart.
•
Always mount the unit on a firm and stable ceiling and
remember that the height above the floor determines the size
of the circular coverage pattern.
•
Do not install the DUO 240 in places where one of the two
detectors alarms constantly or intermittently, due to
environmental interference.
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