GT2-71CN Keyence Digital Contact Sensor Amplifier Unit
The GT2-71CN is a high-accuracy amplifier unit from the Keyence GT2 series. It is designed for precise position and thickness measurement in automated lines. This DIN-rail main unit offers a 0.1 µm display resolution. It also provides NPN open collector outputs and a 4 to 20 mA analog output. The unit works as a core part of a modular GT2 measurement system. It suits engineers who need stable, fast, and repeatable contact sensing.
Technical Specifications
| Brand | Keyence |
| Model | GT2-71CN |
| Series | GT2 series |
| Type | High-accuracy digital contact sensor amplifier unit |
| Mounting | DIN-rail mount, main unit |
| Display range | -199.999.9 to 199.999.9 |
| Display resolution | 0.1 µm |
| Response time | hsp(3)/5/10/100/500/1,000 ms; hsp(12)/20/40/400/2,000/4,000 ms with GT2-Pxxx heads |
| Control input | Timing / preset / reset / bank no-voltage input |
| Supply voltage | 10 to 30 VDC, ripple (p-p) 10 % included, Class 2 |
| Power consumption | 2,200 mW or less (73.3 mA or less at 30 V) |
| Output type | HH/HI/GO/LO/LL NPN open collector, 40 V / 50 mA or less, residual voltage 1 V or less |
| Analog output | 4 to 20 mA, max. load resistance 350 Ω |
| Operating temperature | -10 to +50 °C (No freezing) |
| Relative humidity | 35 to 85 % RH (No condensation) |
| Weight | Approx. 140 g (including power cable) |
| Built-in ports | None |
| Protocols | None |
| Communication expansion | Via optional GT2 series communication units (sold separately) |
Key Performance Data
- Measurement range: -199.999.9 to 199.999.9
- Resolution: 0.1 µm for fine detail detection
- Frequency response: Fastest hsp(3) mode; selectable up to 4,000 ms for stable reads
- Sensitivity and linearity: High-accuracy amplifier design for repeatable contact measurement
- Temperature range: -10 to +50 °C
- Environmental tolerance: 35 to 85 % RH, no condensation
- Interference resistance: Stable NPN open collector outputs with low residual voltage
Installation Guide
- Mount the unit on a standard DIN rail.
- Use the main unit as the central amplifier in the GT2 chain.
- Connect 10 to 30 VDC power with correct polarity.
- Wire timing, preset, reset, and bank inputs as needed.
- Keep signal cables away from high-power lines.
Setup and Maintenance
- Set response time to match your machine cycle.
- Use preset and reset inputs for fast re-zeroing.
- Check analog output load stays below 350 Ω.
- Clean the display and connectors with a dry cloth.
- Verify wiring after any line change.
Compatibility Notes
- Works with GT2-Pxxx contact sensor heads.
- Adds communication via optional GT2 series communication units.
- No built-in fieldbus port on this main unit.
- Fits standard DIN-rail cabinets.
Certifications and Packaging
- Official Keyence production status confirmed.
- Lifecycle status: Active.
- Last verified: 2026-09.
- Package includes the amplifier unit and power cable.
- Weight: approx. 140 g.
Warranty and Shipping
- 12-month warranty on this unit.
- Shipping via FedEx, UPS, and DHL.
- Global shipment support from Oiltech Controls.
- Technical verification before shipment.
Typical Applications
- Thickness measurement on production lines.
- Position checking in automated assembly.
- Wear and gap detection on machinery.
- Quality gate inspection with GO/LO limits.
- In-line measurement where 0.1 µm resolution matters.
Diagnostic Capabilities
- HH/HI/GO/LO/LL judgment outputs show part status.
- Analog 4 to 20 mA signal supports trend monitoring.
- Bank and preset inputs speed up changeover checks.
- Response time selection helps isolate noise issues.
Why Buy From Oiltech Controls?
- 15+ years in industrial automation spare parts.
- Worldwide shipping support.
- Tested surplus and refurbished options.
- 12-month warranty on eligible items.
- Technical check before every shipment.
- Help for obsolete control systems.
FAQ
Q: What is the resolution of the GT2-71CN?
A: It offers 0.1 µm display resolution.
Q: Does this unit have built-in communication?
A: No. You can add communication with optional GT2 units.
Q: What output types are available?
A: It has NPN open collector outputs and a 4 to 20 mA analog output.
Q: What is the supply voltage?
A: 10 to 30 VDC, Class 2.
Q: How fast can it respond?
A: The fastest setting is hsp(3). Slower settings improve stability.
Q: Is a warranty included?
A: Yes, a 12-month warranty applies.
Q: How do you ship?
A: We ship by FedEx, UPS, and DHL.
Contact us at info@oiltechcontrols.com or +86 158 8020 0923.
Copyright © 2026 Oiltech Controls Limited. All rights reserved.
Original Source: https://www.oiltechcontrols.com/
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