GT-71AP Digital Contact Sensor Amplifier by Keyence
GT-71AP is a DIN-rail main amplifier unit from the Keyence GT series. It delivers 1 µm display resolution and a fast 2,000 times/second sampling rate. This unit is built for precise position and presence detection in industrial automation.
Keyence GT-71AP supports PNP open collector output with selectable N.O. / N.C. logic. It offers 7 response time settings from 1.5 ms to 5 s. No built-in communication port. Add optional GT series communication units for network expansion.
Oiltech Controls supplies the GT-71AP as a tested industrial spare. It fits DIN-rail mounting and works with 12 to 24 VDC power. The Eco mode cuts power draw for energy-sensitive panels. Contact us for current stock and lead time.
Technical Specifications
| Brand | Keyence |
| Model | GT-71AP |
| Series | GT series |
| Type | Digital contact sensor amplifier unit, main unit |
| Mounting | DIN-rail mount |
| 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: 600 mW (50 mA) or less at 12 V / 840 mW (35 mA) or less at 24 V |
| Output type | HIGH/GO/LOW PNP open collector, max. 50 mA (40 V or less), residual voltage 1 V or less, N.O./N.C. selectable |
| Operating temperature | -10 to +55 °C (No freezing) |
| Relative humidity | 35 to 85 % RH (No condensation) |
| Built-in ports | None |
| Protocols | None |
| Communication expansion | Via optional GT series communication units (sold separately) |
| Weight | Approx. 110 g (including power cable) |
| Lifecycle | Active; official Keyence production status confirmed (Last verified: 2026-09) |
Installation Guide
- Mount the GT-71AP on a standard DIN-rail. Keep the unit away from heat sources.
- Use a 12–24 VDC supply with ripple below 10 %. Check polarity before power-up.
- Wire the PNP open collector output to your PLC or controller. Set N.O. or N.C. as needed.
- Select response time via the front keys. Choose hsp (1.5 ms) for fast pick-and-place tasks.
- For network integration, add a GT series communication unit. The main unit has no built-in port.
Commissioning and Maintenance
Setup is simple. The GT-71AP has a clear display and tactile keys. You can teach thresholds directly from the front panel. The Eco mode reduces heat and power draw. For maintenance, check wiring annually and confirm 1 µm resolution with a gauge block. Clean the display with a dry cloth. Do not open the housing.
Compatibility Notes
The GT-71AP works with all Keyence GT series sensor heads and communication units. It replaces older GT main units in most DIN-rail setups. The PNP output suits sinking PLC inputs. For NPN systems, use an interface relay. Contact info@oiltechcontrols.com for cross-reference help.
Certification and Packaging
This unit carries the Keyence standard quality mark. Oiltech Controls ships each GT-71AP in antistatic foam with a power cable. Package includes the amplifier, cable, and quick start sheet. 12-month warranty covers functional defects. We ship by FedEx, UPS, and DHL worldwide.
Typical Applications
- Position feedback on DIN-rail assembly machines.
- Presence/absence checks for small parts in feeders.
- Go/no-go gauging with 1 µm display resolution.
- High-speed sorting using 2,000 times/second sampling.
- Eco-sensitive panels with 12–24 VDC supply.
Diagnostic Capability
The GT-71AP shows live values on its digital display. You can read HIGH / GO / LOW status directly. The unit flags unstable readings when response time is too fast for the target. Use the Eco mode to check power behavior. No built-in network diagnostics. Add a GT communication unit for remote monitoring.
Why Buy From Oiltech Controls?
- 15+ years in industrial automation spare parts.
- Global shipment support via FedEx, UPS, DHL.
- Tested industrial surplus and refurbished options.
- 12-month warranty on every GT-71AP.
- Technical verification before shipment.
- Support for obsolete control systems.
Inquiries: info@oiltechcontrols.com or +86 158 8020 0923 (WhatsApp).
FAQ
Q: Does the GT-71AP have built-in communication?
A: No. Add a GT series communication unit for network options.
Q: What is the fastest response time?
A: hsp (1.5 ms). Other settings go up to 5 s.
Q: Can I use this with an NPN PLC?
A: The output is PNP open collector. Use a relay for NPN inputs.
Q: What power supply do I need?
A: 12 to 24 VDC with ripple 10 % or less.
Q: Is the GT-71AP in production?
A: Yes. Official Keyence status is Active (verified 2026-09).
Q: How do I order?
A: Email info@oiltechcontrols.com or message +86 158 8020 0923.
Copyright © 2026 Oiltech Controls Limited. All rights reserved.
Original Source: https://www.oiltechcontrols.com/
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