KEYENCE GT2-71P Product Description

Overview

KEYENCE GT2-71P is a GT2 series DIN-rail mount digital contact sensor amplifier unit with PNP output. The official KEYENCE record identifies it as a main-unit amplifier for high-accuracy contact displacement or LVDT-style measurement systems. It pairs with a compatible GT2 contact sensor head to provide digital position, thickness, gap, deflection or dimension monitoring and discrete comparison outputs for industrial inspection and positioning equipment.

Features

The GT2-71P mounts on a DIN rail and is classified as the main unit in the GT2 amplifier system. The panel display uses a 6 + 1/2 digit 7-segment red LED for measured value display, plus a two-color, 13-level bar LED in red and green and red or green indicators. Display range is -199.999.9 to 199.999.9, with display resolution 0.1 μm.

Control input supports timing, preset, reset or bank input as a no-voltage input. Control outputs are HH, HI, GO, LO and LL, PNP open collector, rated 30 V, 50 mA or less, residual voltage 1 V or less, subject to restrictions when expansion units are connected. Power consumption is 2,200 mW maximum normal, at 30 V and 73.3 mA maximum, and 1,700 mW maximum in power-saving Eco mode, at 30 V and 56.7 mA maximum.

KEYENCE Europe lists UL and CSA standard conformity for the GT2 amplifier record. Italian product reference lists body material as polycarbonate, upper key part as acetal resin, front sheet as PET and cable as PVC; weight approximately 140 g including the power cable. Sensor head type, measurement range, cable length and sensor-head mounting accessory are selected separately and must match the original GT2 system.

Specs

Brand: KEYENCESeries: GT2Model: GT2-71PProduct type: Digital contact sensor amplifier unit Mounting type: DIN-rail mountOutput type: PNP outputMain or expansion: Main unit Measured value display: 6 + 1/2-digit red 7-segment LED Other display: Two-color 13-level bar LED, red and green; red or green indicators Display range: -199.999.9 to 199.999.9Display resolution: 0.1 μmControl input: Timing, preset, reset or bank input; no-voltage input Control output: HH / HI / GO / LO / LL; PNP open collectorOutput rating: 30 V, 50 mA or less, residual voltage 1 V or lessNormal power consumption: 2,200 mW max.; 30 V, 73.3 mA max.Eco power consumption: 1,700 mW max.; 30 V, 56.7 mA max.Conformity: UL and CSA standard conformity per KEYENCE record Body material: Polycarbonate; key upper part acetal resin; front sheet PET; cable PVC per Italian reference Weight: Approximately 140 g including power cable Sensor head: Compatible GT2 head selected separately; exact head model and range unconfirmed Product status: Existing GT2 measurement system amplifier spare

Principle

The amplifier unit receives a signal from a compatible GT2 contact displacement sensor head, conditions the measurement signal, calculates position or displacement, and shows the value on its digital display. Comparison outputs HH, HI, GO, LO and LL provide discrete pass, high or low threshold signals to a PLC, counter, alarm circuit or automation controller. The preset, reset, timing or bank input allows measurement reference, sampling or channel-bank control from external controls.

Replacement should verify the GT2 amplifier model, PNP versus NPN output, compatible sensor head, head cable, DIN rail mounting, supply voltage, output wiring, PLC input type, threshold settings, measurement units, display configuration, bank or channel assignment and whether the original system used main and expansion amplifier units. When expansion units are connected, output current, supply voltage and ambient temperature restrictions may apply according to KEYENCE manual.

Applications

KEYENCE GT2-71P is used on existing GT2 contact measurement stations for dimensional inspection, gap and thickness measurement, run-out or deflection check, press-fit verification, part positioning, flatness or displacement monitoring in machine tools, injection molding, stamping, packaging, semiconductor or electronics assembly, automotive parts inspection, precision jigs and automated test equipment. In legacy installations, it serves as a direct replacement amplifier spare when the GT2 head, cable, output type, supply voltage, mounting and comparison configuration match the original unit.