JNS-Q120 Pneumatic / Rebound / Digital-Display Contact Displacement Grating Sensor

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The contact-type grating displacement sensor combines grating optical principles with a contact probe design to detect changes in object displacement. It achieves high-precision measurement through moiré-fringe interference on the grating scale, with resolutions reaching micrometer or even nanometer levels. The sensor consists of a reading head, scale body and contact probe — when the probe touches the workpiece, displacement is converted into optical signals for output. It offers strong anti-interference and high stability, ideal for harsh industrial environments.

Applications: precision machining (tool positioning, workpiece measurement on CNC machines), metrology (CMM 3D dimensional inspection), semiconductor manufacturing (wafer alignment, thickness monitoring), automotive (part-deformation detection), and material-testing machines (minute tension / compression displacement monitoring for quality control).

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Product Features

Multi-modal Measurement

Supports real-time displacement, vibration, thickness and runout detection, with extreme-value (MAX / MIN) and difference (MAX − MIN) measurement modes.

Resolution ranges from 0.2 μm (high-precision ten-thousandth) to 5 μm (basic), with 1 μm repeatability on the contact type.

Integrated Design

Integrated digital-display structure: display screen, key controls and sensor body in one unit, showing real-time data in micrometers (μm).

Multi-function keys support tolerance setting (upper / lower limit), correction-value calibration and measurement-mode switching (real-time / extreme value).

Industrial-grade Durability

Protection rating IP65 (dust & waterproof), working temperature −10 °C to +60 °C.

The pneumatic model is compatible with Φ4 air tubes, working pressure 0.16 – 0.2 MPa, with strong dust-interference immunity.

Flexible Interfaces & Protocols

• Outputs: RS232 / RS485 (Modbus RTU protocol); IO out-of-tolerance alarm signal (O1 / O2 pins).
• Power supply: grating type DC 5 V (< 50 mA), contact type DC 24 V.
• Installation: standard DIN rail (contact type) or bolt fixation (grating type).

Product Working Principle

Optical Measurement System (Grating Type)

Moiré-fringe interference: a grating ruler paired with an image sensor — relative grating displacement generates changes in the moiré fringes.

Signal conversion: fringe motion is converted into an electrical signal; the processor computes the displacement (accuracy 0.2 μm). A 16-bit ADC digitizes the value and transmits it via Modbus RTU at 38400 bps.

Mechanical Contact Measurement (Integrated Type)

Probe displacement transmission: when the probe contacts the workpiece, mechanical displacement is generated and converted into linear motion by the internal spring blade or pneumatic push device.

Electrical signal generation: displacement changes trigger Hall elements or strain gauges, outputting a proportional voltage / current signal.

Real-time processing: the built-in MCU filters and linearizes the signal, then outputs the digital value to the display screen and the communication interface.

Intelligent Functions

Extreme-value detection: continuously sample and compare peak values; store MAX / MIN to registers 2000H / 3000H.

Tolerance alarm: when out-of-tolerance, a switching signal is output through the yellow (O1) / green (O2) pins.

Application Scenarios

Precision Manufacturing & Inspection

• Semiconductor / optical components: high-precision ten-thousandth sensors (0.2 μm) for wafer thickness and lens surface-shape detection.
• Machining: thousandth / hundredth-grade sensors (1 – 5 μm) monitor tool wear and part circular runout on machine tools.

Industrial Automation Control

• Online sorting: the integrated contact sensor works with IO signals to trigger sorting mechanisms in real time (e.g. rejection of out-of-tolerance workpieces).
• Pneumatic production lines: pneumatic displacement sensors position cylinder strokes and detect assembly clearances in dusty environments.

Research & Quality Control

• Material-deformation research: long-range type (25.4 mm) for monitoring tensile / compressive deformation.
• Dynamic vibration analysis: 50 ms high-speed sampling captures peak vibrations and computes amplitude / frequency.

Special-environment Adaptation

• Moisture / oil-stained scenarios: IP65 version suits automotive-parts inspection and hydraulic-system monitoring.
• Compact spaces: ultra-thin integrated design (21 mm thickness) embeds inside equipment for real-time displacement feedback.

Series & Model Specifications

Safety Light Curtain — Customer Cases

Real installations from DAIDISIKE clients. Click any case to view in full. Filter by scenario to quickly find a similar setup.