What are PIR lenses?

Sensor lenses (Fresnel optics) are interchangeable optical elements that define the PIR motion sensor detection zone. With a suitable lens, you can change the shape and range of the field detected, such as creating narrow curtains, covering wide angles, or increasing the detection distance.

Types of PIR lenses we offer

• Curtain lens: It allows to create a narrow line of detection (curtine), ideal for doors, gates or fences. {index=0}
• Wide-angle lens: Expands the viewing angle of the detector to a very wide area, e.g. 141° for the EWA lens. {index=1}
• Long-range lens: Extends detection distance — the LR lens from the Satellite allows detection at a longer distance. {index=2}
• Fresnel lens universal / repair: Small Fresnel panels or plates (e.g. 46×25 mm) help fix or limit the sensor's too wide field of action. {index=3}
• CT lenses for SLIM enclosures: They allow to change the characteristics of the SLIM-PIR or SLIM-DUAL detector to curtain detection. {index=4}

Why change lenses in PIR detectors?

• Adaptation to the assembly site: If the detector is mounted at a narrow passage (e.g. corridor, gate), the curtain lens will help focus detection on this zone.
• Increased efficacy: The long-range lens will allow you to detect movement further, which can be crucial for larger objects.
• Sensor repair: The damaged or soiled Fresnel lens may worsen the detection — replacing the new lens will restore the original parameters.
• Instead of replacing the entire detector, you can only change the lens, which is a cheaper solution.

What should you pay attention to when choosing a lens?

• Mechanical compatibility: Make sure the lens fits the sensor model (e.g. SLIM, AQUA, VB).
• Detection characteristics: Whether you need a curtain, angle or range – choose the lens that best suits the protected area.
• The lenses are made of plastic (Fresnel plastic), which affects durability and resistance to dirt.
• The lens shall be mounted cleanly, without scratches, so as not to interfere with detection.

Sample detector lenses

• ####### The VB vertical curtain lens (Satel)** — dedicated to VB series detectors, creates a vertical detection curtain. :contentReference[oaicite:5]{index=5} **## Extra wide-angle lens EWA (Satel)** — detection angle up to ~141°, range up to 15 m. :contentReference[oaicite:6]{index=6} **##### Long-range LR lens (Satel)** increases detection distance in Aqua detectors. :contentReference[oaicite:7]{index=7} **##CT-CL2 cover with curtain lens** — panel with lens for SLIM-PIR and SLIM-DUAL detectors, easy replacement. :contentReference[oaicite:8]{index=8} **##Fresnel lens 46×25 mm** — universal optical plate for repair or modification of small PIR sensors. {index=9}

Also possible (import / accessories DIY)

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