WELiT PIR wall mount motion sensor IR W3140

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Product Details:

WELiT PIR wall mount motion sensor IR W3140

Key Feature

Details Of Security Systems

Night Vision :   No
Complete Kit :   No
Suitable For :   Homes, Hotels, Factories, and Hospitals

Warranty Details

Duration :   1 Year

Country Of Origin

Country Of Origin :   


IR W3140 is a wall mount infrared motion sensor. The specially designed reflector gives it coverage angle of 140° with an angle of aperture of 90° and maximum reach of 10 meters.

Motion sensor

Motion sensor is an intelligent device which controls the ON-OFF operation of electrical loads. When it detects motion inside its detection area, it automatically turns the load ON. It turns OFF the load after preset time delay if no movement is detected for the set time.

It provides artificial light only when it is needed. This reduces the large amount of energy wastage and helps in making the most energy efficient lightings.

IR W3140 – wall mount PIR motion sensor

IR W3140 is a wall mount passive infrared motion sensor. The assembly of highly sensitive pyro-sensor and specially designed reflector provides the unmatched coverage of 140°. It detects heat radiated from a body. Segmented lenses divide the whole detection area into passive and active zones. When any warm object like human body moves between the zones, it is detected as a change in voltage by the pyro-sensor. When it detects such movement, it triggers the switching mechanism to operate the connected load.

As the pyro-sensor operates by detecting change in the temperature, the ambient temperature plays important role in working of this motion sensor. Maximum detection reach distance mentioned in the technical specifications is measured at the ambient temperature of 25 C. Detection reach distance might change with the change in ambient temperature.


Selecting the installation location

Mounting height: With the increased mounting height, the detection area increases and sensitivity to detect the movement is reduced. Hence the product must be installed at the optimal mounting height to suit the particular application.

Detection cone: Make sure to cover the required detection area. Avoid window surfaces.

Avoid exposure to direct light. This may disturb the operation of photocell and it might not able to measure the correct ambient brightness level.

Do not place devices that radiate heat inside the motion sensor’s detection zone.

Minimum distance of 50 cm should be maintained between the light and the motion sensor, since the heat radiated from the light source could result in false triggering of the sensor.

Avoid disturbance or distraction by obstacles or moving objects like fan, curtains, ventilator drafts, hanging lamps, trees, etc. It cannot detect the movement through obstacles like glass partition, wall, etc.

Passive infrared motion sensor detects movements at right angles (tangential movement) more precisely. Decide the place for installation accordingly. 


Motion sensor connection terminals


Motion sensor has 3 connection terminals.

Black: Phase IN (L)

White: Neutral IN (N)

Red: Phase OUT - load (L’)

Connecting several motion sensors in parallel

Several motion sensors can be connected in parallel. Make sure not to exceed the maximum load rating of a motion sensor. Also all the motion sensors must be connected to the same phase line.


Adjustable settings

Two settings are available to adjust the operation of the motion sensor to suit the particular application. These setting can be altered any time. The last setting will remain stored in the system in the event of power failure.

Twilight setting:

With in-built photocell, motion sensor continuously measures ambient light and constantly compares it with the preset light threshold level. Load is switched ON when ambient light falls below a specific threshold while it detects the movement. When there is enough ambient light (above the set threshold value), motion sensor does not turn ON the load even there is any movement inside the detection area.

This threshold value of lighting level can be set with the help of twilight setting knob. Set the knob fully anticlockwise to set the minimum Light level of 10 L. This will turn ON the load by movements only when the ambient brightness is very low, hence during the night time. To set the maximum L level of 2000 L, set the knob fully clockwise. This will turn ON the load by movements even in the full ambient brightness condition, i.e. even during day time. Similarly intermediate settings can be done by adjusting the knob accordingly.

There is no clock inside the system. Hence motion sensor decides the time based on the ambient light level.

Time setting:

When motion sensor detects any movement inside its detection area, it automatically turns the load ON. It turns OFF the load after preset time delay if no movement is detected for the set time.

This off-delay time can be set with the time setting knob. Set the knob fully clockwise to set the minimum time of appox. 10 sec. To set the maximum time of 6 min, set the knob fully anticlockwise. Similarly intermediate settings can be done by adjusting the knob accordingly. Any movement detected during this off-delay time will re-start the timer.



When power is applied to motion sensor, it calibrates its system. During this calibration process, load turns ON for the preset off-delay timing. It takes around 20 seconds of time till it comes to steady state condition. During this time motion sensor does not detect any movement. Modify any setting only after it comes to steady state condition.

Follow the below sequence for required time and Light settings.

-          Set the Light to maximum (Day mode).

-          First, adjust the Time setting knob to set the required off-delay timing.

-          Set the desired Light value by adjusting the l setting knob.


Technical specifications


Operating voltage

230-240 VAC / 50 Hz

Maximum load

-     1100 W (Resistive load, e.g. Incandescent lamps)

-     450 W (Inductive, uncorrected load, cos ϕ = 0.5, e.g. Fluorescent lamps)

-     350 W (Series corrected loads)

-     350 W (Parallel corrected, with C = 45.6 μF)

-     Capacitive loads, Electronic ballasts, e.g. low-energy lamps, max. of 6 loads, C ≤ 132 μF

Angle of coverage


Angle of aperture


Installation type

Wall mount

Installation Height

1.5 – 3.5 m

Sensor technology

Passive infrared motion detection


10 m

Time setting

10 sec – 6 min

Twilight setting

10 – 2000 L

Ambient temperature

-10 to +40 C



More Details

Maximum Retail Price (inclusive of all taxes) :   Rs.1200
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Country of Origin / Manufacture / Assembly :   India
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