Scientech Electronics IR2N User Manual

INTRODUCTION

The PIR-2S Passive Infrared Detector is specially designed for providing space protection in a wireless
security system. It detects the movement of human body heat within its effective coverage; thus when an
intruder crosses or enters the area, the resulting change in infrared energy from the intruder will be detected
and an alarm signal will transmit to the Base Unit.

Fig. 1

Fig. 2

IMPORTANT NOTE

To get the best sensitivity, PIR should be mounted to detect movement of the
intruder "across" room, rather than "toward" the detector.

PIR MOTION DETECTOR

Do not install where the detector faces a window, since movement outside could
cause unwanted alarms.

Make sure the detection area does not have obstructions (curtains, screens, large
pieces of furniture, plants, etc.) that could block the pattern of coverage.

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Avoid placing the sensor in areas containing objects likely to produce a rapid
change in temperature, such as central heating radiators or ducts (or heaters of
any kind), air conditioners, open flame, etc.

Note that pets can trip sensors and plan sensor placement and pet-restricted
areas accordingly.

INSTALLATION

Remove the front cover by holding the base in one hand, and squeezing the top center of back cover

1.

with the other hand (Fig.1).

2. Insert two AAA alkaline batteries. Select “Installer Mode” on the Base Unit, and enter the Installer

2m 6m 15m

Password to gain access authority. Then select \Set Device\Enroll Device\Burglar Sensor\Enter Zone
No. to enroll the ID of PIR-2S by pressing its TEST button on the PC board. You may change its
various attributes under \Set Device\Change Device Setting\Burglar Sensor Change, to fulfill different
requirements.

Important Notice: In order to reset the microprocessor properly, before replacing the batteries in the
PIR-2S, please press the TEST button for 5 seconds to discharge the energy that remains in the
capacitor on the PC board. Otherwise, it may not restart.

Wait 5 minutes (after power on) for sensor warm-up. Because the PIR-2S is a low-power design, it

3.

takes a few minutes to reach stable state.
Attach the base with the supplied Velcro (or with optional bracket) at a selected location, and make

4.

sure the distance between PIR and Base Unit is not over RF transmission range.

5. WALK TEST

It is essential to perform a walk test to verify optimum detection coverage. To do this, first hold the

TEST” button on the PIR-2S board down for at least 3 seconds, until the LED turns ON→OFF→ON,

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then release the button. Afterward, the PIR-2S enters “TEST” mode for 3 minutes. Replace the cover of
the PIR-2S, then walk into the detection area at normal speed, observing the LED indicator. The LED
stays ON normally, and turns OFF when motion is detected. If the detection pattern is not satisfactory,
re-aming the detector or adjusting the vertical pattern by sliding the PC Board (refer to Table 1) is
recommended.

Notes: 1) Test mode can be terminated before the 3-minutes timeout, by pressing the “TEST” button

again untill the LED turns OFF. Afterward, it returns to NORMAL mode.

2) In NORMAL mode, the PIR-2S activates, the transmitter when it initially detects the first
movement, then disables itself. The unit will resume operation only after about 3 minutes wit
no further detection of movement. In other words, if installed in a heavy traffic area, the
PIR-2S will not transmit, until the area has been evacuated for 3 minutes. The purpose of this
feature is to reduce power consumption and prolong battery life.

6. RADIO LINK TEST

Open the top cover of the PIR-2S, and press the TEST button on the PC Board to see whether the Base
Unit can receive the radio signal.

7. PULSE COUNT SELECTION

The PIR-2S is equipped with a programmable pulse counter; that can be set by placing the jumper on
the desired setting (2 or 4). The PIR-2S automatically overrides to one-pulse mode while in "TEST"
mode.

2 pulses:

This setting has high sensitivity of detection. Two pulses should be selected when the

detection range is longer (over 5m)

4 pulses:

Alarm signal will only be sent if 4 pulses are detected within approximately 1 minute. This
setting provides the maximum protection against false alarms caused by all types of
environmental disturbances.

8. LED ON/OFF SELECTIO N

After installation, the user may put LED ON/OFF jumper at OFF position to prevent the PIR from
being discovered by an intruder. Nevertheless, the LED is enabled automatically when the PIR-2S is in

TEST” mode, even with the jumper in the OFF position.

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VERTICAL ADJUSTMENT

The detection pattern can be adjusted by sliding the PC Board up and down. Usually, adjustment is
unnecessary when the PIR-2S is mounted between 1.7 to 2.5 meters from the floor. If the mounting height is
out of this range, refer to the following table.

HEIGHT 1-1.6m 1.7-2.5m 2.6-3.2m

SCALE

1 2 3

Table 1

DETECTION PATTERN

2m

TOP VIEW

SIDE VIEW