Visonic Inc. DUO240E ユーザーズマニュアル

 

DUO 240 

 

 

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  

 

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. 

DE1826 

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