Visonic DUO 240 - INSTALLER GUIDE Installation Instructions Manual

DE1826 1

DUO 240

Ceiling-Mount Dual Technology Intrusion Detector

Installation Instructions

1. INTRODUCTION

DUO 240 is a microcomputer-controlled, ceiling-mounted dual­technology 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 (Nominal: 12 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 10.8 m

(35 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

2.4 m

(

8 ft

)

10.8 m (35 ft)

4.5 m
(15 ft)

4.8 m (16 ft)

SIDE VIEW

TOP VIEW

PIR

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, UL-639

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.

2 DE1826

3.2 Mounting

Select the mounting location
in accordance with the
guidelines in Section 3.1.
Make sure that the expected
intruder's path will cross the
detector's coverage pattern.
DUO 240 units can be
mounted at the maximum
height of 4.5 m (15 ft).
Proceed as follows:
A. Hold the base with one

hand as shown in Fig. 2.
Twist the cover counter­clockwise with the other
hand until it stops.
Separate the cover from

Figure 2. Separating the Cover

from the Base

the base, and put it in a safe place, to avoid accidental

damage.

B. Press the base against the ceiling in the selected location.

Mark the two points for drilling through the mounting holes
(see Fig. 3).

Note: The mounting holes are accessible without removing
the printed circuit board from the base. Do not drill with the
detector held in place, to avoid contaminating the unit with
dust and drilled fragments.

C. Put the base aside, drill the two holes in the ceiling and insert

masonry anchors if necessary.

D. Punch out at least one wiring knockout (preferably the one

close to the terminal block).

E. Align the unit (including printed circuit board) with the mounting

holes and fasten it firmly to the ceiling with two screws.

Figure 3. Component Layout

3.3 Wiring

Connect wires to the terminal block in the following order (Fig. 4):

Terminal: TAMP

(tamper switch)

Connect to: A normally closed 24-hour tamper zone of the
control panel.

Details: Once the cover is removed, the tamper switch opens.

Terminal: NC

(alarm relay)

Connect to: Normally closed burglar protection zones of the
control panel.

Details: Upon alarm or power failure, the output relay's normally
closed contacts open.

Terminal: TRB

(trouble output)

Connect to: 24-hour trouble zone, parallel to an E.O.L. resistor
(see Figure 4).

Details: The TRB open collector output will be grounded upon
detector malfunction, causing disturbance in the trouble zone of
the associated alarm system.

Alternative: A buzzer or an interface relay (100 mA max.) may
be connected across the TRB output and the 12 V (+) terminals.

In UL installations, the buzzer, control panel or relay to which
the trouble output is connected must be UL-listed.

Terminals: 12 V(+) and (–)
Connect to: A power source within the range of 9 VDC to 16

VDC. Take care not to reverse the polarity.
Details: It is advisable to connect the power source only after all

other connections have been completed and rechecked.
Disconnect the AC mains from the alarm control panel and verify
that the voltage supplied to the detector is above 9 Volts with the
backup battery as the only power source.

IMPORTANT: To comply with CE safety requirements, connect to
CE-approved control panels with current-limited DC output.

Note: Use RTV to seal the base opening(s) to prevent insects
from entering the detector.

Figure 4. Terminal Block Wiring

3.4 The Power-up Process

After connecting the (+) and (–) terminals to the power source,
the DUO 240 starts a 60-second warm-up period, indicated by
alternate flashing of the green and red LEDs.

Caution! If the alternate flashing of the LEDs does not stop
within 60 seconds, a failure has been detected by the self-test
circuitry and the TRB output is activated

4. INDICATORS AND SELECTORS

4.1 LED Indications

The two LEDs (Fig. 3), which are hidden behind the lens when
the cover is installed, are visible through the lens when
illuminated. They are used to signal various alarm and trouble
messages as shown in Table 1 below:

Notes:

1. During walk testing, the first LED to respond is the green one.
It illuminates steadily (MW detection) or flashes (PIR
detection), depending on which detector discovered the
movement first. Upon subsequent discovery of the movement
by the other detector, the green LED will go off and the red
LED will illuminate (alarm).

2. If the green and red LEDs continue to flash beyond the warm­up period, a malfunction has been diagnosed. Replace the
unit without delay.