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How does a measuring light curtain differ from a safety light curtain?

Update Time:2026/7/2

Measuring light curtains are designed for dimensional measurement and object profiling, while safety light curtains are designed to protect personnel by stopping hazardous machinery when a person enters a dangerous area. They serve fundamentally different purposes.

Industrial automation factory safety Industrial machinery

Key Differences

FeatureMeasuring Light CurtainSafety Light Curtain
Primary PurposeDimension measurement, position detection, profilingPersonnel safety, machine stop on intrusion
Output TypeRS485/RS232, 4-20mA, 1-10V analog or digital measurement dataOSSD safety outputs (dual-channel), relay
Response TimeTypically 5-50ms depending on scan rateTypically less than 20ms for safety stop
ResolutionHigh resolution (2.5mm, 10mm, 20mm beam spacing)Finger (14mm), hand (30mm), body (50mm+)
Safety CertificationNot required (measurement device)Required (SIL3, PL e, Type 4)
Output DataPrecise measurement data for object size/positionBinary ON/OFF state (safe/unsafe)

When to Use Which

Use Measuring Light Curtain When

You need to measure part dimensions, detect object position, count items, profile shapes, or perform quality control inspections on a production line.

Use Safety Light Curtain When

You need to protect operators from hazardous machine motion, create a safety perimeter, or comply with machinery safety regulations (ISO 13849, IEC 62061).

Case Example

Scenario: An automotive parts assembly line requires both dimensional inspection and operator protection.

Solution: Install DADISICK DK-QL measuring light curtains (10mm beam spacing) at the inspection station to measure part dimensions. Separately install DADISICK safety light curtains around the robot cell to ensure operator safety. The two systems work independently — one measures, the other protects.

Explore DADISICK Measuring Light Curtains

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