Keyence GT-71A Amplifier Unit | GT Series NPN

Keyence GT-71A Digital Contact Sensor Amplifier

Product Introduction

The GT-71A belongs to the Keyence GT series, a family of digital contact sensor components. Specifically, this model serves as the main amplifier unit that powers and processes signals from GT series sensor heads. Furthermore, its DIN-rail mounting design simplifies integration into control panels and machine enclosures. Meanwhile, the unit provides a clear digital display for real-time measurement monitoring.

Technical Specifications

The GT-71A amplifier delivers a display range of -99.999 to 999.999 with a display resolution of 1 µm. Additionally, its sampling rate reaches 2,000 times per second, which supports fast and accurate readings. The response time is selectable across seven settings: hsp (1.5 ms), 5 ms, 10 ms, 100 ms, 500 ms, 1 s, and 5 s. Therefore, users can balance speed and stability for different measurement tasks.

Moreover, the unit provides HIGH/GO/LOW NPN open collector outputs. The maximum output current is 50 mA at 40 V or less, with residual voltage of 1 V or less. Besides, the N.O./N.C. logic is selectable, which adds flexibility for various control configurations. For communication expansion, optional GT series communication units are available separately.

Electrical and Environmental Parameters

The GT-71A operates on a supply voltage of 12 to 24 VDC with ripple of 10 % or less. In normal mode, power consumption stays at 1,140 mW (95 mA) or less at 12 V and 1,200 mW (50 mA) or less at 24 V. Furthermore, the power-saving Eco mode reduces consumption to 600 mW (50 mA) or less at 12 V and 840 mW (35 mA) or less at 24 V.

First, the ambient temperature rating spans -10 to +55 °C with no freezing permitted. Next, the relative humidity tolerance covers 35 to 85 % RH without condensation. Finally, the unit weighs approximately 110 g including the power cable, which keeps panel load minimal.

Installation Guide

Installing the GT-71A begins with snapping the unit onto a standard DIN-rail inside the control cabinet. First, connect the sensor head cable to the input terminal according to the wiring diagram. Next, wire the power supply within the 12 to 24 VDC range and confirm polarity. Then, attach the output lines to your PLC or control circuit.

Furthermore, set the response time based on your measurement speed requirements. For instance, choose hsp (1.5 ms) for fast dynamic tasks or 100 ms for stable readings. Besides, configure the N.O./N.C. output logic to match your control system. In addition, verify the display readings against a known reference before production use.

Packaging List

• 1 × Keyence GT-71A Amplifier Unit

• 1 × Power Cable

FAQ

Q1: Does the GT-71A include a sensor head?
No. The GT-71A is an amplifier unit only. You must order a compatible GT series sensor head separately.

Q2: What is the display resolution of the GT-71A?
The GT-71A provides a display resolution of 1 µm across its full display range.

Q3: Can the GT-71A communicate with a PLC network?
The GT-71A has no built-in communication port. However, you can add optional GT series communication units for network expansion.

Q4: How do you ship this item?
We ship via Fedex, UPS, DHL with tracking. Delivery times vary by destination and selected service.

Q5: What output type does the GT-71A provide?
The GT-71A offers HIGH/GO/LOW NPN open collector outputs with selectable N.O./N.C. logic.