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Contact-Type Displacement Sensor

Contact-Type Displacement Sensor

Contact-Type Displacement Sensors
What is A Contact-Type Displacement Sensor?

What is A Contact-Type Displacement Sensor?

A contact-type displacement sensor is a precision measurement device that detects changes in position or displacement by making direct contact with the measured object. Unlike non-contact sensors, it eliminates potential interference from environmental factors such as light, dust, or electromagnetic fields, ensuring high accuracy and stability.

These sensors typically operate based on optical (grating), inductive, resistive, capacitive, or piezoelectric principles, converting physical displacement into electrical signals for precise measurement.
The high precision and sensitivity of contact-type displacement sensors are primarily attributed to the following features:

▪️Direct Contact: The probe directly contacts the measured object, eliminating potential interferences (such as optical or magnetic interference) common in non-contact sensors.
▪️Precision Design: The mechanical structure of the probe and the signal processing circuitry are optimized to capture and amplify minute displacement changes.
▪️High Resolution: The sensor's physical effects are highly sensitive to small changes, enabling high-resolution measurements.
Additionally, the signals from contact-type displacement sensors are typically amplified, filtered, and digitized before being output as digital or analog signals for real-time display or further analysis.

Types of Contact-Type Displacement Sensors
Contact-Type Displacement Sensor GFJ Series
The GFJ Series contact-type displacement sensor adopts a spring self-reset driving mechanism, with a built-in spring-driven sensor probe. It offers two measurement ranges: 12.7mm and 25.4mm. Utilizing grating encoding technology, the sensor accurately measures displacement changes through a high-precision optical reading system. Featuring absolute grating encoding, the sensor can directly read absolute positions, effectively preventing data loss after power failure and ensuring reliable and continuous measurement results.
High-Accuracy Contact Digital Displacement Sensor GFK & GFW Series
The GFK & GFW Series digital integrated contact displacement sensor employs spring-return or air-push driving mechanisms, enabling rapid response to measurement needs. Equipped with a high-definition digital display, the sensor provides real-time measurement data and comes standard with MODBUS protocol, RS485 interface, and I/O interface, facilitating seamless data transmission to upper computers or PLC systems.
Contact-Type Displacement Sensor GFJ Series
High-Accuracy Contact Digital Displacement Sensor GFK & GFW Series
These series of sensors are ideal tools for high-precision measurement, suitable for detecting minute dimensional changes, including displacement, vibration, inner diameter, outer diameter, perpendicularity, roundness, straightness, and other geometric tolerances. Additionally, they are widely used in online inspection applications such as automotive components, bearings, gears, electronic product housings, and glass, ensuring product quality and production efficiency.

Application Examples of Contact-Type Displacement Sensors
Contact-type displacement sensors are versatile tools designed for high-precision measurement across a wide range of industrial applications. From ensuring the flatness of lithium batteries to inspecting coupling assembly alignment, these sensors deliver unmatched accuracy and reliability. They are essential for measuring the flatness of precision products, detecting motor shaft misalignment in lithium batteries, and verifying crankshaft dimensions in automotive manufacturing. Additionally, they play a critical role in automotive component size inspection, lithium plate thickness measurement, transmission part height verification, and resin roll eccentricity detection. With their ability to provide real-time, accurate data, contact-type displacement sensors are indispensable in industries such as new energy, automotive, precision manufacturing, and material processing, ensuring quality control and enhancing production efficiency.
Contact Displacement Sensor Measuring Lithium Battery Flatness
Measuring Lithium Battery Flatness
High-Precision Contact Sensor for Coupling Assembly Inspection
Coupling Assembly Inspection
Precision Flatness Measurement with Contact Displacement Sensor
Precision Product Flatness Measurement
Lithium Motor Shaft Misalignment Measurement Using Contact Sensor
Measuring Lithium Motor Shaft Misalignment
Crankshaft Dimension Measurement with High-Accuracy Contact Sensor
Crankshaft Dimension Measurement
Automotive Part Size Measurement by Contact Displacement Sensor
Automotive Component Size Measurement
Contact Sensor for Measuring Lithium Plate Thickness with High Precision
Measuring Lithium Plate Thickness
Transmission Part Height Measurement Using Contact Displacement Sensor
Transmission Part Height Measurement
Resin Roll Eccentricity Measurement with Contact Displacement Sensor
Resin Roll Eccentricity Measurement

Contact-Type Displacement Sensors List
Contact-Type Displacement Sensor
Contact-Type Displacement Sensor GFJ Series
Models
Measuring range
Resolution
Accuracy
Response time
GFJ-HA
0-12.7 mm
5μm
≤10μm
50ms
GFJ-KA
1μm
±2μm(≤4μm)
GFJ-WA
0.5μm
≤2μm
GFJ-GWA
0.2μm
≤1.4μm
GFJ-HB
0-25.4 mm
5μm
≤10μm
GFJ-KB
1μm
±3μm(≤6μm)
GFJ-WB
0.5μm
≤3μm
GFJ-GWB
0.2μm
≤1.8μm
Contact Digital Displacement Sensor
Contact Digital Displacement Sensor GFK & GFW Series
Models
Measuring range
Resolution
 Repeat accuracy
 Measurement force
GFK/W-01
1mm(±0.5mm)
Minimum 0.1μm
 0.2μm
1.2N (middle position)
 GFK/W-02
 2mm(±1mm)
0.3μm
 0.9N (middle position)
GFK/W-05L
 5mm(±2.5mm)
 0.5μm
 0.6N (middle position)
GFK/W-05S
GFK/W-10L
 10mm(±5mm)
 1μm
0.8N (middle position)
GFK/W-10S
GFK/W-10P
 10mm(±5mm)
 min 0.2N
DADISICK's displacement sensors are engineered for precision in demanding industrial applications. These sensors offer high-accuracy measurements and robust performance, making them a trusted choice for quality control and automation.
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FAQs About Contact Displacement Sensors

What is a Contact Displacement Sensor?
Q: How does a contact displacement sensor work?
A: A contact displacement sensor works by directly touching the measured object with a probe, converting the object's displacement changes into electrical signals (such as resistance, capacitance, inductance, or piezoelectric signals), which are then processed to output measurement results.

What is the difference between contact and non-contact displacement sensors?
A: Contact sensors measure displacement through physical contact, making them suitable for high-precision measurements. Non-contact sensors (e.g., laser or ultrasonic sensors) do not require contact and are ideal for measuring deformable or high-temperature objects.
What Are the Driving Methods of Contact Displacement Sensors?
Contact displacement sensors offer various driving methods, including:
• Spring Return (Self-Reset): The probe automatically resets via spring force, suitable for rapid measurements.
• Split Type (with Iron Core Linkage): The probe is separate from the sensor body, ideal for complex installation environments.
• Vacuum Suction: The probe is fixed via vacuum suction, suitable for smooth surface measurements.
• Free-Fall Ultra-Light Contact: The probe falls freely with minimal contact force, ideal for fragile objects.
• Pneumatic: The probe is driven by air pressure, suitable for applications requiring constant contact force.
How to Choose the Right Contact Displacement Sensor?
Q: What parameters should be considered when selecting a contact displacement sensor?
A: Key parameters include:
• Measurement range (stroke)
• Accuracy (e.g., micron or nanometer level)
• Output signal type (analog or digital)
• Environmental adaptability (temperature, humidity, protection rating)
• Probe type (spherical, pointed, flat, etc.)

Q: When should I choose a digital integrated contact displacement sensor?
A: If real-time data display, portability, or quick on-site measurements are required, a digital integrated sensor is the better choice.
Installation and Usage
Q: What should I pay attention to when installing a contact displacement sensor?
A: During installation, ensure:
• The probe is perpendicular to the measured object to avoid tilting.
• Avoid excessive impact or vibration to prevent probe damage.
• Select an appropriate protection rating (e.g., IP65 for water and dust resistance) based on environmental conditions.

Q: How to calibrate a contact displacement sensor?
A: Use standard gauge blocks or objects of known dimensions for calibration. Adjust the zero point and range according to the manual to ensure measurement accuracy.
Maintenance and Troubleshooting
Q: What should I do if the probe of a contact displacement sensor is worn out?
A: Probe wear can affect measurement accuracy. Regularly inspect and replace the probe. Using wear-resistant materials (e.g., tungsten carbide) can extend the probe's lifespan.

Q: What might cause unstable measurement results?
A: Possible causes include:
• Poor probe contact or wear.
• Environmental interference (e.g., vibration, temperature changes).
• Unstable power supply voltage.
• Poor signal cable contact or electromagnetic interference.
Technical Support and After-Sales Service
Q: How can I get technical support for the sensor?
A: You can contact our technical support team, providing the product model, issue description, and relevant parameters for professional assistance.

Q: Is there a warranty for the sensor?
A: Yes, we offer a one-year warranty covering repair or replacement for non-human damage.
About the Measurement Range of Displacement Sensors
Q: How to choose the right displacement sensor based on the measurement range?
A: The selection of a displacement sensor's range depends on specific measurement requirements:

1️⃣Small Displacement Measurement (typically millimeter-level or smaller):
• Strain gauges
• Inductive sensors
• Linear Variable Differential Transformers (LVDTs)
• Eddy current sensors
• Hall effect sensors
• These sensors are suitable for high-precision, small-range displacement detection.

2️⃣Large Displacement Measurement (typically centimeter-level or larger):
• Inductosyns
• Grating sensors
• Capacitive grating sensors
• Magnetic grating sensors
• Magnetostrictive sensors
• These sensors are suitable for large-range, high-resolution displacement measurement.

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