Keyence GT2-71CN Amplifier Unit | NPN Analog

Keyence GT2-71CN Amplifier Unit with Analog Output

This article explains the Keyence GT2-71CN digital contact sensor amplifier unit and its measurement roles. Furthermore, it covers technical specifications, installation guidance, packaging details, and common questions.

Product Introduction

The Keyence GT2-71CN belongs to the GT2 series of high-accuracy digital contact sensor amplifiers. Specifically, this main unit mounts on a DIN rail and controls the full amplifier chain. Additionally, it provides both switching judgments and a 4-20 mA analog signal. Therefore, it suits inline inspection and closed-loop positioning tasks.

Technical Specifications

The GT2-71CN displays values from -199.999.9 to 199.999.9 with 0.1 µm display resolution. Its fast response time starts at 3 ms in hsp mode. Moreover, selectable response settings include 5, 10, 100, 500, and 1,000 ms.

When paired with GT2-Pxxx heads, response options expand to 12, 20, 40, 400, 2,000, and 4,000 ms. Consequently, users can balance speed and stability for each task. The control input supports timing, preset, reset, and bank no-voltage signals.

Electrical Parameters

The GT2-71CN runs on 10 to 30 VDC with 10 % ripple included. Power consumption stays at 2,200 mW or less, drawing 73.3 mA or less at 30 V. The NPN open collector output covers HH, HI, GO, LO, and LL judgments.

Output ratings reach 40 V and 50 mA or less, with residual voltage at 1 V or less. Besides, the analog output provides 4 to 20 mA with a maximum load resistance of 350 Ω. Additionally, communication expansion is possible through optional GT2 series communication units, which are sold separately.

Environmental and Physical Parameters

Operating temperature spans -10 to +50 °C without freezing. Meanwhile, relative humidity tolerance covers 35 to 85 % RH without condensation. The unit weighs approximately 140 g including its power cable.

Installation Guide

First, snap the GT2-71CN onto a standard DIN rail inside the control panel. Next, connect the power cable to a 10 to 30 VDC Class 2 supply. Then, link the amplifier to a GT2 series sensor head using the dedicated connector. Finally, wire the analog output to your PLC or recorder input.

As a main unit, the GT2-71CN manages connected expansion units on the same rail. Therefore, plan rail space for the full amplifier chain. Besides, keep analog cabling away from high-voltage lines to reduce noise.

Packaging List

• 1x Keyence GT2-71CN Amplifier Unit

• 1x Power Cable

• 1x Mounting Hardware Set

• Shipping via Fedex, UPS, DHL

FAQ

Q1: What is the display resolution of the GT2-71CN?
A: The GT2-71CN provides 0.1 µm display resolution. This supports fine dimensional inspection tasks.

Q2: Does the GT2-71CN include analog output?
A: Yes. It offers a 4 to 20 mA analog output. The maximum load resistance is 350 Ω.

Q3: What is the difference between this unit and the GT2-72N?
A: The GT2-71CN is a main unit with analog output. The GT2-72N is an expansion unit without analog output.

Q4: What is the fastest response time available?
A: The fastest setting is 3 ms in hsp mode. Other options range from 5 ms up to 4,000 ms.

Q5: What supply voltage does the GT2-71CN require?
A: It requires 10 to 30 VDC with 10 % ripple included. Use a Class 2 power source for safe operation.