Blog Details

Author: KRONZ Technical Team
Published: July 2026
Reading Time: 8–10 Minutes

Choosing the correct measuring distance is one of the most important decisions when selecting a laser displacement sensor. While many users focus on output type or measurement accuracy, the sensing distance has an even greater impact on installation flexibility, measurement stability, and overall system performance.

A measuring distance that is too short may limit installation options, while a distance that is too long may reduce the achievable measurement accuracy for precision applications. Understanding how different measuring distances are used can help engineers select the most suitable sensor for their automation projects.

This guide explains the characteristics of common measuring distances and provides practical recommendations for selecting the right laser displacement sensor.

The measuring distance defines the optimal working range between the sensor and the target object.

Selecting the correct distance helps achieve:

• Higher measurement accuracy
• Better repeatability
• Easier installation
• More stable detection
• Improved equipment safety
• Greater production efficiency

Rather than choosing the longest available measuring range, engineers should select a sensor that best matches the actual installation distance of their application.

A 30 mm laser displacement sensor is designed for ultra-short-range precision measurement.

Because the sensor is installed close to the target, it provides excellent repeatability and is ideal for applications requiring micron-level positioning accuracy.

• Electronic component inspection
• PCB assembly
• Semiconductor manufacturing
• Precision positioning
• Connector inspection
• Micro-mechanical assembly

KRONZ KD25-30 Series

A 50 mm measuring distance provides a balance between installation flexibility and high measurement accuracy.

It is one of the most common choices for factory automation and general industrial inspection.

• Packaging machinery
• Assembly automation
• Product positioning
• Vision-assisted inspection
• Small robotic systems
• Production line detection

KRONZ KD25-50 Series

A 100 mm laser displacement sensor is suitable for medium-distance industrial measurement where additional installation space is required without sacrificing measurement stability.

• CNC machinery
• Robot positioning
• Height inspection
• Thickness measurement
• Automated assembly
• General industrial automation

KRONZ KD25-100 Series

A 200 mm measuring distance offers significantly greater installation flexibility for medium and large automation equipment.

The increased sensing distance makes it easier to integrate sensors into production systems with moving machinery or larger workpieces.

• Material handling systems
• Robotic automation
• Automated production lines
• Machine positioning
• Warehouse automation
• Industrial inspection

KRONZ KD25-200 Series

A 400 mm laser displacement sensor is designed for extended-range industrial applications.

The KRONZ KD25-400 Series provides an effective measuring range of 200–600 mm, allowing engineers to install the sensor farther from the target while maintaining reliable non-contact measurement.

This extended range improves equipment accessibility, installation flexibility, and operator safety in large automation systems.

• Heavy machinery
• Large production equipment
• Industrial robots
• Automated logistics
• Large workpiece inspection
• Intelligent manufacturing

KRONZ KD25-400 Series

The following table provides a quick comparison of common measuring distances.

Before choosing a laser displacement sensor, consider the following questions:

Measure the actual installation distance rather than estimating it.

Compact machines often require shorter measuring distances, while large automation systems benefit from longer sensing ranges.

Higher precision applications generally perform best with shorter measuring distances.

Applications involving moving objects or changing positions often require additional measuring range to maintain stable detection.

Dust, vibration, temperature, and ambient light should all be considered when selecting the appropriate sensor.

Many users choose the wrong measuring distance because they assume that a longer range is always better.

Common mistakes include:

• Choosing an unnecessarily long measuring distance
• Ignoring installation space limitations
• Overlooking accuracy requirements
• Selecting the wrong output configuration
• Not considering future equipment upgrades

Choosing a sensor based on actual application requirements results in better performance and lower overall system cost.

Selecting the correct measuring distance is essential for achieving accurate, reliable, and efficient non-contact measurement.

Whether your application requires 30 mm ultra-precision detection, 50 mm general automation, 100 mm industrial positioning, 200 mm robotic integration, or 400 mm extended-range measurement, choosing the appropriate sensor improves installation flexibility, system reliability, and long-term production performance.

The KRONZ KD25 Series offers a complete range of measuring distances together with NPN or PNP output options and Switch Output or Dual Output configurations, making it easy to find the right solution for virtually any industrial automation application.

Expand your knowledge of laser displacement sensing with these related technical articles from the KRONZ Technical Resource Center.

• What Is a Laser Displacement Sensor? A Complete Guide to Working Principles, Types, and Industrial Applications
• How to Choose the Right Laser Displacement Sensor
• What Measuring Distance Should You Choose for a Laser Displacement Sensor?
• Switch Output vs Dual Output: Which Output Configuration Is Right for Your Application?
• NPN vs PNP Output: Understanding the Differences in Industrial Automation
• Laser Displacement Sensor vs Photoelectric Sensor: What's the Difference?

• How to Install a Laser Displacement Sensor Correctly
• Common Laser Sensor Installation Mistakes
• Laser Displacement Sensor Troubleshooting Guide

• Laser Sensors for Robotic Positioning

Explore the complete KRONZ KD25 Series to find the ideal measuring distance for your application.

Selecting the correct measuring distance is critical for achieving reliable and accurate measurement results. The KRONZ Technical Team can help you evaluate your application and recommend the most suitable KD25 Series model based on your installation space, target size, accuracy requirements, and control system.

Contact KRONZ today for:

• Product selection assistance
• Application engineering support
• OEM & ODM services
• Technical consultation
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