1. What is a Motion Sensor?
2. Cautions for use
1. Checkpoints relating to principle of operation
MP motion sensors are passive infrared sensors which
detect changes in the infrared rays. They may fail to
detect successfully if a heat source other than a human
being is detected or if there are no temperature changes
in or movement of a heat source. Care must generally be
taken in the following cases. The performance and relia-
bility of the sensors must be checked out under condi-
tions of actual use.
<1>Cases where a heat source other than a human being
1) When a small animal enters the detection range.
2) When the sensor is directly exposed to sunlight, a
vehicle’s headlights, an incandescent light or some
other source of far infrared rays.
3) When the temperature inside the detection range has
changed suddenly due to the entry of cold or warm
air from an air-conditioning or heating unit, water
vapor from a humidifier, etc.
<2> Cases where it is difficult to detect the heat source
1) When an object made of glass, acrylic or other sub-
ject which far infrared rays have difficult passing
through is located between the sensor and what is to
2) When the heat source inside the detection range
hardly moves or when it moves at high speed; for
details on the movement speed, refer to the section
on the performance ratings.
2. Other handling cautions
1) Be careful not to allow dust or dirt to accumulate on
the lens as this will adversely affect the detection sen-
2) The lens is made of a soft material (polyethylene).
Avoid applying a load or impact since this will deform
or scratch the lens, making proper operation impossi-
ble and causing a deterioration in its performance.
3) The sensor may be damaged if it is exposed to static
with a voltage exceeding ±200V. Therefore, do not
touch its terminals directly, and exercise adequate care
in the handling of the sensor.
4) When the leads are to be soldered, solder them by
hand for less than 3 seconds at a temperature of less
than 350°C 662°F at the tip of the soldering iron. Avoid
using a solder bath since this will causing a deteriora-
tion in the sensor’s performance.
5) Do not attempt to clean the sensor. Cleaning fluid may
enter inside the lens area causing a deterioration in
6) When using the sensors with cables, it is recommend-
ed that cables which are shielded and as short as pos-
sible be used in order to safeguard against the effects
Cautions for MP Motion Sensor ‘ ’
1. Ambient operating conditions
1) Avoid using the sensor in environments containing
excessive amounts of steam, dust, corrosive gas, or
where organic solvents are present.
2) When the sensor is used in noisy environments, con-
nect a capacitor (minimum 33 µF) across its power
1) Check all wiring before applying power. Incorrect wiring
may damage the internal circuit (in particular, check
that the connection to the power supply is not
2) Avoid excessive removing and replacing of the connec-
3. Detector surface (Optical surface)
1) Keep the detector surface clean. Excessive dust or dirt
on the detector surface will deteriorate the sensing
2) Do not allow condensation or freezing to occur on the
surface of the sensor. If condensation or freezing does
occur at low temperatures, the sensor may not detect
3) This product is designed to detect the existence of
human body. The sensor will not detect objects consist-
ing of a low reflective material (e.g., an object coated
with black rubber, etc.) or of a highly reflective material
(e.g., mirror, glass, coated paper, etc.)
4) The front surface of the lens and case are made of
polycarbonate resin and can withstand water, alcohol,
oils, salts and weak acids. Other fluids such as alka-
lines, aromatic hydrocarbons and halogenated hydro-
carbons may melt or swell the lens and case, please
do not have such fluids touch the lens and case.
5) To protect the inner circuit, wiring should be max. 3 m
4. Recommended installation procedure
Install the MA motion sensor so that it is orientated cor-
rectly in relation to the pass directions of the target
objects as shown in the figure below.
Cautions for MA Motion Sensor
❈ → stands for pass direction of the target object.
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