kjt

KJT-LD18
Radar Sensor Longer Range · Higher Accuracy · Greater Stability
— A Complete Upgrade Beyond Ultrasonic Sensing Measuring Range Up to 20 m Better Performance · More Cost-Effective

KJT-LD18 radar sensor

KJT-LD18 Radar Sensor

122GHz Millimeter-Wave Radar (FMCW) | Resistant to Dust, Steam and Light | Smart IO-Link Visualization

KJT-LD18 Radar Sensor

The KJT-LD18 series of KJT radar ranging sensors are high-performance radar sensors that employ advanced frequency modulated continuous wave (FMCW) technology. They feature ultra-narrow beam angles, wide measurement ranges, and strong environmental adaptability. They are designed for precise ranging and object detection in complex industrial scenarios, facilitating efficient operation of industrial automation, intelligent equipment, and level monitoring.

Radar vs Ultrasonic

Comparison ItemKJT-LD18 Radar Sensor Traditional Ultrasonic Sensor
Measurement Principle122GHz Millimeter-Wave Radar (FMCW)Acoustic Wave Reflection
Measuring Distance Up to 20m Ultra-Long Range❌ Typically ≤ 1 m ~ 2 m
Effective Measurement Capability⭐ Stable and accurate even at long distances❌ Errors increase significantly as distance increases
Measurement Accuracy <2mm （High Accuracy）Generally ±1%FS
Response Speed ⭐ <40ms（millisecond-level response） Slower response
Interference Resistance✅ Unaffected by dust, steam or light❌ Easily affected by dust, temperature and airflow
Environmental Adaptability-40℃ ~ 65℃ , IP67/IP68/IP69KStrongly affected by temperature; lower protection rating
Stability / Temperature DriftLong-term stability with low temperature driftObvious temperature drift and accuracy deviation
Material InfluenceUnaffected by color or transparencyEasily affected by object color and material
Penetration CapabilitySupported (penetrates plastic / dirt)Penetration not supported
Beam Angle8° Precise focusing Large divergence; prone to sidelobe interference
Performance in Harsh EnvironmentsStable operation in dust, rain, fog and strong lightProne to failure or false triggering
Smart FunctionsIO-Link adjustable / visualization / parameter self-adaptationBasic switching output with limited functions
Cost Advantage Better performance-to-price ratio (efficient replacement)High-end models are expensive and still performance-limited
Benefits for Your Usage
  • Provides stable and reliable measurement signals even under harsh conditions, strong ambient light and heavy contamination  
    • High measurement accuracy and repeatability across the full range, with minimal temperature drift  
    • Suitable for outdoor operation from -20 to 70 °C without an additional protective enclosure
    • Designed to pass IP68/IP69 protection tests as well as more demanding proTect+ sealing tests
  • Simple and flexible installation 
    • Compact structure for installation in confined spaces
  • Easy and precise adjustment for different application requirements
    • Expanded functionality via IO-Link interface  
    • User-friendly interface for visualizing measurement data
  • Fast measurement speed with rapid response to position changes  
    • Ultra-short millisecond-level response time
  • No distortion caused by nearby object obstruction 
    • Precise focusing with a narrow radar beam angle and a measuring range up to 20 m
Applications

Radar technology is especially suitable for outdoor and off-highway applications such as agricultural machinery, construction equipment and port machinery.

  • •  Vehicle positioning and measurement in car wash and parking systems
  • •  Position detection for bridge cranes, crane trolleys and transfer carts
  • •  Anti-collision monitoring for cranes and fully automated systems
  • •  Detection and positioning of large moving objects such as trains
  • •  Object presence detection on ground or road surfaces such as asphalt
  • •  Height control for sprayer booms and combine harvester attachments
  • •  Level detection in open or closed containers, including pressurized vessels

Vehicle Positioning and Measurement in Car Wash Systems

  • The radar sensor measures vehicle position and dimensions to enable accurate brush positioning in drive-through and tunnel car wash systems.
  • Sensor signals are unaffected by water mist and cleaning agents.

 

Ground Distance Measurement for Asphalt Pavers

  • Precise ground distance measurement.
  • Measurement results are unaffected by air or asphalt temperature.

Height Control for Combine Harvester Attachments

  • Measures the distance between the ground and plants to control attachment height.
  • By measuring both the ground and plant distance, the actual crop height can be determined.
  • Fast response time.

All-Weather Water Level Data Detection

  • The radar sensor uses non-contact measurement technology. It emits microwave pulses toward the water surface and receives reflected echoes to accurately calculate the distance from the sensor to the water surface, thereby determining the water level.

Stable Water Level Control

  • The radar sensor provides high-accuracy, highly stable non-contact water level data, unaffected by surface fluctuations, foam, steam or temperature changes.

Strong Reflection On Different Materials

  • Radar sensors use the strong reflection generated by microwave signals at the interface between two media with significantly different dielectric constants to achieve interface measurement.
Technology
Measuring Distance to Flat or Round Objects

Measuring Distance to Flat or Round Objects

For flat objects, it is important that the surface tilt angle does not exceed half of the radar divergence angle. This ensures that the radar beam reflected from the object surface can return to the sensor for reliable detection. Round objects benefit from rotational symmetry, allowing part of the radar beam to be reflected back to the sensor at all times, which simplifies calibration. However, compared with flat objects of the same size, round objects reflect weaker radar signals.

Distance Measurement Through Covers

Distance Measurement Through Covers

Radar beams can penetrate certain materials, such as plastic covers, for distance measurement, and the covers do not need to be fully transparent. For example, the radar sensor can “see through” black plastic panels. Although a small portion of the radar beam is reflected back by the cover, the sensor can learn and ignore this reflection profile through a unique self-learning algorithm. It can then directly measure the object behind the cover as if the cover were not present.

Radar Barrier Sensors Enable Highly Reliable Object Detection

Radar Barrier Sensors Enable Highly Reliable Object Detection

With specific settings, the radar sensor can also operate like a through-beam sensor. Through a unique self-learning algorithm, the radar sensor learns the reflector position and then monitors it. Once an object interrupts the radar beam between the sensor and the reflector, the sensor switches its output state. The advantage of this design is that the object does not need to reflect the signal back to the sensor. Therefore, object shape and reflectivity are not critical—objects of any shape, even radar-absorbing materials, can be reliably detected.

Frequency-Modulated Continuous Wave (FMCW) Radar Sensor

Frequency-Modulated Continuous Wave (FMCW) Radar Sensor

  • Radar sensor using frequency-modulated continuous wave technology.
  • Measures object distance and relative speed.
  • Uses high-frequency radar waves with a compact design and narrow beam angle.
proTect+ Sealing Design

proTect+ Sealing Design

  • Excellent reliability and sealing performance throughout the sensor lifetime.
  • Passed thermal shock testing across the full temperature range to simulate aging effects.
  • IP69 protection against dust ingress and high-temperature, high-pressure water.
KJT Sensor Kit

KJT Sensor Kit

  • Analyze, configure and use smart sensor solutions with IO-Link interfaces.
  • Fully understand and unlock the potential of IO-Link devices and KJT products.
  • Visualize sensor functions and support products from different manufacturers.
  • Clean, easy-to-use software design with practical guidance and support information.

Technical Documents

  • Considerations for Lighting in a Manufacturing Environment

    Why is radar technology a good detection solution?

    Learn More
  • Considerations for Lighting in a Manufacturing Environment

    10 Things You Should Know About Radar Sensors

    Learn More
  • Considerations for Lighting in a Manufacturing Environment

    Radar sensors can easily measure the filling level of bulk containers

    Learn More
  • Considerations for Lighting in a Manufacturing Environment

    Ten characteristics of radar sensors

    Learn More
  • Considerations for Lighting in a Manufacturing Environment

    Common Questions About Radar Sensors

    Learn More
  • Considerations for Lighting in a Manufacturing Environment

    What is a radar sensor?

    Learn More
  • Considerations for Lighting in a Manufacturing Environment

    Applications of radar sensors

    Learn More
  • Considerations for Lighting in a Manufacturing Environment

    Detection capability of radar sensors

    Learn More

Product

Service Center

About Us

Contact Us

Message

Copyright © 2020-2025 KJT·KJTDQ All Rights Reserved
{SITE_TONGJI}