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GLK Smart Signal Isolator for Automation

A compact universal signal isolator that intelligently isolates current, voltage, and RS485 signals for reliable, simplified automation integration.
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GLK Smart Signal Isolator

GLK smart signal isolator supporting multiple signal types. Compatible with current, voltage, and RS485 communication signals, allowing one module to fit more field instrument signals.

Smart Isolation for More Signal Types

One unified module series fits a wider range of field instrument requirements.

The GLK Smart Signal Isolator is engineered to support a comprehensive range of industrial inputs, including standard analog current, voltage, and digital RS485 communication signals. By consolidating these capabilities into a single, versatile product series, facility managers and system integrators can effectively address diverse field instrument requirements without sourcing multiple disparate converter models. This broad compatibility proves highly advantageous in complex automation projects where analog transmitters, voltage-output sensors, and digital communication devices coexist within the same control architecture.

GLK signal isolator with active and passive output options. Active current, passive current, and DC voltage outputs are available for easier matching with PLC, DCS, meters, and acquisition modules.

Active & Passive Output Options

Ensures seamless matching with PLCs, DCS, panel meters, and acquisition modules.

To ensure seamless integration with various receiving systems, the GLK series provides flexible output configurations tailored for different control setups. This versatility is critical for engineers tasked with matching isolators to programmable logic controllers (PLCs), distributed control systems (DCS), and remote data acquisition modules. The active current output is designed to directly drive a receiving loop, eliminating the need for external power sources on the output side. Conversely, the passive current output is ideal for integrating with externally powered acquisition equipment, while the DC voltage output easily connects to standard voltage-input terminals.

GLK signal isolator with PWR and ALM status indicators for faster troubleshooting. Indicators clearly show power and input status to reduce inspection time inside control cabinets.

Status Indicators for Faster Troubleshooting

In high-density industrial control cabinets, rapid fault identification is essential for minimizing costly operational downtime. The GLK Smart Signal Isolator features highly visible PWR (Power) and ALM (Alarm) LED status indicators, providing maintenance personnel with immediate, at-a-glance verification of module power and input conditions. During initial system commissioning or routine fault inspections, technicians can instantly determine whether the unit is receiving adequate power and whether an input signal anomaly or out-of-range alarm is present—all without the need to disconnect signal loops or manually probe individual terminal blocks.

Working Principle Diagram

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Technical Specifications

Input Load / Input Impedance:Current ≤ 50 Ω; Voltage ≥ 300 kΩ


Maximum Output Load Resistance:Current ≤ 500 Ω; Voltage ≥ 10 kΩ


Response Time:≤ 10 ms


Temperature Drift (ppm/℃):5 ppm/°C


Linearity Error:≤ ±0.1% FS


Zero & Span Adjustment:Range selection via DIP switches + fine-tuning via potentiometer


Support Reverse Signal:Supports 20–4 mA, 0–10 V


Transmitter Power Supply:DC 24 V power supply included as standard across the entire series


Isolation Mode(Input / Output / Power):Three-terminal reinforced optocoupler isolation


Dielectric Withstand Voltage:2500 V AC


Insulation Resistance:≥100 MΩ

Dimension Chart

1 In 1 Out: L*W*H : 118.9mm x 12.5mm x 110mm

1 In 3 Out: L*W* H : 118.9mm x 17.7mm x 110mm

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Wiring Diagram

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Phone: +86-19715617532
Add: Building 14, University Science and Technology Park, Fenghuangshan Economic Development Zone, Xiangshan District, Huaibei City, Anhui Province

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