GT-71A Keyence Digital Contact Sensor Amplifier – DIN-Rail Main Unit
GT-71A from Keyence is a general-purpose digital contact sensor amplifier. It belongs to the GT series. This DIN-rail main unit uses an NPN output. It delivers fast, precise measurement for industrial automation. The 1 µm display resolution and 2,000 times/second sampling support demanding inspection tasks. The GT-71A is active and in production. Last verified: 2026-09.
Technical Specifications
| Brand | Keyence |
| Model | GT-71A |
| Series | GT series |
| Type | Digital contact sensor amplifier unit |
| Mounting | DIN-rail mount, main unit |
| Display range | -99.999 to 999.999 |
| Display resolution | 1 µm |
| Sampling rate | 2,000 times/second |
| Response time | hsp (1.5 ms), 5 ms, 10 ms, 100 ms, 500 ms, 1 s, 5 s (selectable) |
| Supply voltage | 12 to 24 VDC, ripple (p-p) 10 % or less |
| Power consumption | Normal: 1,140 mW (95 mA) or less at 12 V; 1,200 mW (50 mA) or less at 24 V. Eco mode: 600 mW (50 mA) or less at 12 V; 840 mW (35 mA) or less at 24 V |
| Output type | HIGH/GO/LOW NPN open collector, max. 50 mA (40 V or less), residual voltage 1 V or less, N.O./N.C. selectable |
| Built-in ports | None |
| Protocols | None |
| Communication expansion | Via optional GT series communication units (sold separately) |
| Operating temperature | -10 to +55 °C (No freezing) |
| Relative humidity | 35 to 85 % RH (No condensation) |
| Weight | Approx. 110 g (including power cable) |
| Protection rating | Not available |
| Dimensions (H×W×D) | Not available |
| Storage temperature | Not available |
Measurement Performance and Environmental Resistance
- Measurement range: -99.999 to 999.999 with 1 µm resolution
- Frequency response: Fastest response 1.5 ms (hsp), selectable up to 5 s
- Sensitivity: 1 µm display step, stable contact sensing
- Linearity: Maintained across full display range
- Temperature range: -10 to +55 °C operating
- Environmental tolerance: 35 to 85 % RH, no condensation
- Anti-interference: NPN open collector output with residual voltage ≤1 V
Installation Guide
- Mount the GT-71A on a standard DIN rail.
- Connect 12 to 24 VDC power. Keep ripple below 10 %.
- Use the NPN open collector output for HIGH, GO, and LOW signals.
- Select N.O. or N.C. logic as needed.
- Add optional GT series communication units for network expansion.
Debugging and Maintenance Convenience
- Front display shows live values from -99.999 to 999.999.
- Response time is selectable via simple parameter change.
- Eco mode reduces power draw for long-term use.
- No built-in ports simplify wiring for basic tasks.
- Routine checks include power voltage and output load.
Compatibility Notes
- Works with GT series sensor heads and communication units.
- NPN output matches common PLC and controller inputs.
- Optional communication units add network protocols.
- Main unit only. Sensor head sold separately.
Certification Information
Official Keyence production status confirmed. Lifecycle: Active. Last verified: 2026-09. Contact us for current certification documents.
Packing List
- GT-71A amplifier unit × 1
- Power cable × 1
- Documentation set × 1
Warranty and Shipping
- 12-month warranty against defects.
- Shipping via FedEx, UPS, and DHL.
- Global shipment support.
Typical Application Scenarios
- Thickness and gap checking on production lines.
- Position verification for small parts.
- Inspection of electronic components.
- Automotive parts dimension control.
- Obsolete control system support and replacement.
Diagnostic Capabilities
- Real-time display for quick pass/fail checks.
- HIGH/GO/LOW output states support simple diagnostics.
- Response time selection helps isolate noise issues.
- Eco mode aids power-related troubleshooting.
Why Buy From Oiltech Controls?
- 15+ years in industrial automation spare parts.
- Global shipment support for urgent needs.
- Tested industrial surplus and refurbished options.
- 12-month warranty on eligible products.
- Technical verification before every shipment.
- Support for obsolete control systems.
Contact us for inquiries: info@oiltechcontrols.com or +86 158 8020 0923.
FAQ
Q: What is the display resolution of the GT-71A?
A: It is 1 µm.
Q: Can I add communication to this unit?
A: Yes. Use optional GT series communication units.
Q: What is the fastest response time?
A: hsp mode gives 1.5 ms.
Q: Does it include a sensor head?
A: No. This is the main amplifier unit only.
Q: What output type does it use?
A: NPN open collector, selectable N.O. or N.C.
Q: What is the warranty period?
A: 12 months.
Q: How is it shipped?
A: Via FedEx, UPS, or DHL.
Copyright © 2026 Oiltech Controls Limited. All rights reserved.
Original Source: https://www.oiltechcontrols.com/
Reviews
There are no reviews yet.