PIR Sensor Element: Detection Range Up to 12 meters

Q: What is the difference between PIR and microwave motion sensors?

PIR sensors detect infrared radiation from moving heat sources, while microwave sensors emit and detect reflected radio waves. PIR is more energy-efficient and less prone to false triggers from non-living objects, but microwave sensors can detect through non-metallic materials.

Q: How does ambient temperature affect PIR sensor performance?

Extreme temperatures can reduce sensitivity. Most industrial PIR sensors include temperature compensation circuits and operate effectively between -20°C to +70°C. Sudden temperature changes may cause false triggers until the sensor stabilizes.

Component Specifications

Definition

A passive infrared sensor element is a pyroelectric component that detects motion by sensing changes in infrared radiation emitted by objects within its detection range. It consists of a pyroelectric material that generates electrical signals when exposed to varying thermal radiation, typically configured with dual or quad sensing elements to differentiate between ambient temperature changes and moving heat sources.

Working Principle

The PIR sensor element operates on the pyroelectric effect, where certain crystalline materials generate a temporary voltage when their temperature changes. When a warm object (like a human) moves across the sensor's field of view, it creates a differential infrared radiation pattern between paired sensing elements, producing a measurable electrical signal that indicates motion.

Materials

Lithium tantalate (LiTaO3) or lead zirconate titanate (PZT) pyroelectric crystals, silicon window with Fresnel lens array, ceramic substrate, gold or aluminum electrodes, epoxy encapsulation

Technical Parameters

Parameter	Typical range	Notes & selection driver
Field Of View	110° x 70°
Output Signal	Digital pulse or analog voltage
Response Time	<2 seconds
Supply Voltage	2.7-6V DC
Detection Range	Up to 12 meters
Spectral Response	8-14 μm
Operating Temperature	-20°C to +70°C

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 13849-1, IEC 60947-5-2, UL 60730

Parent Products

This component is used in the following industrial products

Motion Sensor

This motion sensor is a component designed for integration into outdoor solar bollards.

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Engineering Analysis

Risks & Mitigation

False triggering from HVAC airflow
Reduced sensitivity in high ambient temperatures
Lens contamination reducing detection range
Electrical interference in industrial environments

FMEA Triads

Trigger: Pyroelectric crystal degradation
Failure: Reduced sensitivity or complete detection failure
Mitigation: Regular calibration checks, environmental sealing, using industrial-grade components with extended temperature ratings

Trigger: Fresnel lens contamination
Failure: Decreased detection range and false negatives
Mitigation: Install protective covers, implement regular cleaning schedules, use anti-static coatings

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±10% detection range variation, ±5°C temperature compensation accuracy

Test Method

ISO 13849-1 performance level testing, IEC 60947-5-2 electrical safety testing, environmental stress screening (ESS)

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

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Inspection readiness

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Supplier transparency

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Manufacturers of PIR Sensor Element

Manufacturer profiles associated with PIR Sensor Element.

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Frequently Asked Questions

What is the difference between PIR and microwave motion sensors?