Product Recommendation | KJT Precision Displacement Sensor Family: Covering Optical Grating Absolute Measurement, Spring-Rebound, and Pneumatic Solutions

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DISPLACEMENT SENSOR FAMILY

More Than a Range of Measurements—A Complete Precision Measurement Solution

Covering optical grating absolute measurement, spring-rebound, and pneumatic options—making microscopic displacements measurable, transmittable, and actionable.

• MAX. RESOLUTION: Up to 0.1 μm

• MAX. MEASURING RANGE: Up to 25.4 mm

• COMMUNICATION INTERFACES: RS232 / RS485

Measuring micro-level changes to establish fact-based quality control.

How to Translate Invisible Variations into Quality Data?

Stepping Beyond "Is It in Position?" to "How Much Did It Deviate?"

In precision manufacturing, product quality is governed by minute variations undetectable to the naked eye: part height compliance, press-fitting depth accuracy, surface warpage, runout, and eccentricity on rotating parts.

Answering these questions requires continuous, accurate, and controller-accessible displacement data rather than simple binary presence detection.

What Is a Pencil/Gauge-Type Displacement Sensor?

When the contact probe touches the workpiece, the measuring spindle produces a linear displacement matching the target’s position; the sensor converts this mechanical movement into readable, transmittable, and actionable electronic data.

Key Inspection Tasks Supported:

• Height, thickness, step height, and groove depth;

• Flatness, parallelism, and perpendicularity;

• Inner/outer diameter, eccentricity, ovality, and radial/axial runout;

• Press-fit travel, valve stroke, and machine tool positioning.

Series Scope: KWT2, KWT3, KWT4, and KWT7 utilize optical grating absolute measurement schemes; KWI and KWH utilize full-bridge differential inductive coil architectures. Together, they constitute KJT’s precision displacement product portfolio.

01 / KWT Series: Selecting Range Based on the Inspection Task (5 mm to 25.4 mm)

Short strokes emphasize micro-reading; longer strokes accommodate wider dimensional shifts.

Note: "Max Display Resolution" reflects top-tier specifications on product datasheets; actual absolute accuracy, repeatability, and outputs depend on the specific configuration.

The KWT series integrates an optical grating system with an image sensor for absolute measurement. Supported models offer RS232 or RS485 communication for direct integration with PLCs, industrial PCs (IPCs), digital display counters, and data acquisition units.

02 / Spring-Rebound, Pneumatic-Push, and Pneumatic Grating: What Are the Differences?

Actuation methods define how the probe approaches the workpiece, how it resets, and how contact force is governed.

1. KWT7 | Pneumatic Grating:

   0–12.7 mm stroke, 0.16–0.2 MPa operating air pressure, uses Φ4 mm tubing. Ideal for automated inspection stations requiring controlled probe extension and retraction cycles.

2. KWI | Spring-Rebound Full-Bridge Inductive:

   Offers 2 mm, 5 mm, and 10 mm stroke options, repeatability $\le 0.15\ \mu\text{m}$, IP65 enclosure. Tungsten carbide probe tips and precision ball bearing guides ensure contact repeatability and mechanical longevity.

3. KWH | Pneumatic-Push Full-Bridge Inductive:

   10 mm stroke, minimum measuring force as low as 0.2 N, adjustable contact pressure via pneumatic regulation. Ideal for delicate workpieces such as glass, medical vials, and flexible plastics requiring feather-light touch.

Three Factors When Choosing the Actuation Method:

• Inspection Takt Time: Does the probe require continuous contact, cyclic air actuation, or instant spring-rebound?

• Workpiece Sensitivity: Fragile, scratch-prone, or deformable materials demand strictly regulated measuring force.

• Ambient Site Conditions: Verify air supply availability, space constraints, ingress protection, and maintenance accessibility.

03 / Four On-Site Values of a Standardized Family

Measurement accuracy is merely the baseline; the true return is feeding verifiable data into manufacturing control.

1. Finer Measurement: Transforms sub-micron variations into quantitative data for strict tolerance gating.

2. Flexible Selection: Wide span of ranges, accuracy classes, and drive styles eliminates over- or under-specifying.

3. Simpler System Integration: Streams continuous values to PLCs or IPCs via RS232 / RS485 buses.

4. Gentle Workpiece Adaptability: Balances probe tip metallurgy with controlled contact forces across metals, glass, and polymers.